Patent Publication Number: US-7585976-B2

Title: Hemiasterlin derivatives and uses thereof

Description:
PRIORITY CLAIM 
     This Application is a divisional of U.S. patent application Ser. No. 10/667,864, filed Sep. 22, 2003 now U.S. Pat. No. 7,064,211, which is a Continuation-In-Part and claims the benefit under 35 U.S.C. § 120 of International Application No.: PCT/US03/08888, filed Mar. 21, 2003, and published in English under PCT Article 21(2). which claims priority to U.S. Provisional Patent Application No. 60/366,592, filed Mar. 22, 2002, the entire contents of each of the above-referenced applications are incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     Hemiasterlin (1) was first isolated from the sponge Hemiasterella minor (class, Demospongiae; order, Hadromedidia; family, Hemiasterllidae) collected in Sodwana Bay, South Africa (see, Kashman et al. U.S. Pat. No. 5,661,175). It was reported that Hemiasterlin exhibited antitumor activity against several cell lines, including human lung carcinoma, human colon carcinoma and human melanoma. 
     
       
         
         
             
             
         
       
     
     After the initial isolation and reporting of this compound, additional hemiasterlins were isolated, and several hemiasterlin derivatives were synthesized and their biological activity was also investigated. It was subsequently reported that Hemiasterlin and certain analogs thereof exhibit antimitotic activity and thus are useful for the treatment of certain cancers (see, U.S. Pat. No. 6,153,590 and PCT application WO 99/32509). However, only a rather limited number of Hemiasterlin analogs were prepared, half of which were the natural products themselves, isolated from  Cymbastela  sp., or were obtained by modifications to the natural products. Thus the number and types of derivatives that could be prepared and evaluated for biological activity were limited. 
     Clearly, there remains a need to develop synthetic methodologies to access and examine the therapeutic effect of a variety of novel derivatives of Hemiasterlin, particularly those that are inaccessible by making modifications to the natural product. It would also be of particular interest to develop novel compounds that exhibit a favorable therapeutic profile in vivo (e.g., are safe and effective, while retaining stability in biological media). 
     SUMMARY OF THE INVENTION 
     As discussed above, there remains a need to develop novel Hemiasterlin analogs to evaluate their potential as therapeutic agents for the treatment of cancer. The present invention provides novel compounds of general formula (I), 
     
       
         
         
             
             
         
       
         
         
           
             and additionally provides methods for the synthesis thereof and methods for the use thereof in the treatment of cancer, wherein R 1 -R 7 , X 1 , X 2 , R, Q, and n are as defined herein. The inventive compounds also find use in the prevention of restenosis of blood vessels subject to traumas such as angioplasty and stenting. 
           
         
       
    
    
    
     DETAILED DESCRIPTION OF CERTAIN PREFERRED EMBODIMENTS OF THE INVENTION 
     In recognition of the need to access and further explore the biological activity of novel derivatives of Hemiasterlin, and this class of peptides in general, the present invention provides novel peptide compounds, as described in more detail herein, which demonstrate antitumor activity. Thus, the compounds of the invention, and pharmaceutical compositions thereof, are useful for the treatment of cancer. In certain embodiments, the compounds of the present invention can be used for the treatment of diseases and disorders including, but not limited to prostate, breast, colon, bladder, cervical, skin, testicular, kidney, ovarian, stomach, brain, liver, pancreatic or esophageal cancer, lymphoma, leukemia and multiple myeloma. In certain other embodiments, the inventive compounds also find use in the prevention of restenosis of blood vessels subject to traumas such as angioplasty and stenting. 
     1) General Description of Compounds of the Invention 
     The compounds of the invention include compounds of the general formula (I) as further defined below: 
     
       
         
         
             
             
         
       
         
         
           
             wherein n is 0, 1, 2, 3 or 4; 
             X 1  and X 2  are each independently CR A R B , C(═O), or —SO 2 —; wherein each occurrence of R A  and R B  is independently hydrogen, or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; 
             R 1  and R 2  are each independently hydrogen, —(C═O)R C  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; wherein each occurrence of R C  is independently hydrogen, OH, OR D , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; wherein R D  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; 
             each occurrence of R 3  and R 4  is independently hydrogen, or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; or wherein any two R 1 , R 2 , R 3  and R 4  groups, taken together, may form an alicyclic, heteroalicyclic, alicyclicc(aryl), heteroalicyclic(aryl), alicyclic(heteroaryl) or heteroalicyclic(heteroaryl) moiety, or an aryl or heteroaryl moiety; 
             R 5 , R 6  and R 7  are each independently hydrogen, —(C═O)R E  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R E  is independently hydrogen, OH, OR F , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein any two R 5 , R 6  and R 7  groups, taken together, form an alicyclic, heteroalicyclic, alicyclic(aryl), heteroalicyclic(aryl), alicyclic(heteroaryl) or heteroalicyclic(heteroaryl) moiety, or an aryl or heteroaryl moiety; wherein R F  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; or R 7  may be absent when NR 7  is linked to R via a double bond; 
             R is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             Q is OR Q′ , SR Q′ , NR Q′ R Q″ , N 3 , ═N—OH, or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; wherein R Q′  and R Q″  are each independently hydrogen, or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, may form an alicyclic, heteroalicyclic, alicyclic(aryl), heteroalicyclic(aryl), alicyclic(heteroaryl) or heteroalicyclic(heteroaryl) moiety, or an aryl or heteroaryl moiety; and 
             pharmaceutically acceptable derivatives thereof. 
           
         
       
    
     In certain embodiments, compounds of formula (I) and compounds described in classes and subclasses herein, are not naturally occurring Hemiasterlins. 
     In certain embodiments, compounds of formula (I) and compounds described in classes and subclasses herein, do not have the following structure: 
     
       
         
         
             
             
         
       
     
     In certain embodiments of compounds described directly above and compounds as described in certain classes and subclasses herein, the compounds do not comprise more than four consecutive α-amino acid residues, and/or one or more of the following groups do not occur simultaneously as defined:
         (a) n is 1;
           X 1  and X 2  are each C(═O);   R 1  and R 2  are each independently hydrogen, aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, Ar-aliphatic-, Ar-alicyclic-; and, where at least one of R 1  and R 2  is aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, Ar-aliphatic-, Ar-alicyclic- and neither are Ar, Ar-aliphatic- or Ar-alicyclic-, R 1  and R 2 , taken together, may form a three-to seven-membered ring; wherein Ar is defined as substituted or unsubstituted phenyl, naphtyl, anthracyl, phenanthryl, furyl, pyrrolyl, thiophenyl, benzofuryl, benzothiophenyl, quinolyl, isoquinolyl, imidazolyl, thiazolyl, oxazolyl or pyridyl;   R 3  is hydrogen;   R 4  is —CR 4a R 4b R 4c  wherein R 4a  and R 4b  are each independently hydrogen, aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, Ar-aliphatic-, Ar-alicyclic-; and, where at least one of R 4a  and R 4b  is aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, Ar-aliphatic-, Ar-alicyclic- and neither are Ar, Ar-aliphatic- or Ar-alicyclic-, R 4a  and R 4b , taken together, may form a three- to seven-membered ring; and R 4c  is hydrogen, aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, Ar-aliphatic-, Ar-alicyclic- and Ar; wherein Ar is as defined directly above;   R 5 , R 6  and R 7  are each independently hydrogen, aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, Ar-aliphatic-, Ar-alicyclic- and Ar;   R is a moiety selected from the group consisting of: a linear, saturated or unsaturated, substituted or unsubstituted alkyl group containing one to six carbon atoms; and   Q is —OR G , —SR G , —NR G R H , —NHCH(R K )CO 2 H, or —NRCH(R K )CO 2 H, wherein R G  and R H  are each independently hydrogen, aliphatic, alicyclic, heteroaliphatic or heteroalicyclic; R K  is aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, or a moiety having the structure —(CH 2 ) t NR K1 R K2 , wherein t=1-4 and R K1  and R K2  are independently hydrogen, aliphatic, alicyclic, heteroaliphatic, heteroalicyclic or —C(NH)(NH 2 );   
           (b) n is 1;
           X 1  and X 2  are each C(═O);   R 1  is an optionally substituted methylene or —CH═ group bonded to the indole moiety thereby forming a tricyclic moiety;   R 2  is hydrogen, an optionally substituted alkyl or acyl group, or is absent when R 1  is —CH═ as defined above;   R 3  is hydrogen or is absent when CR 3  and CR y R z , as defined herein, are linked by a double bond;   R 4  is a moiety having the structure:   
               

     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein R w , R y  and R z  are each independently hydrogen, or optionally substituted alkyl or acyl, or R z  is absent when CR 3  and CR y R z , as defined herein, are linked by a double bond; R x  is hydrogen or an optional substituent, or is absent when R 1  is an optionally substituted methylene or —CH═ group as defined above; Y is an optional substituent; and m is 0, 1, 2, 3 or 4; 
                 R 5  is hydrogen, OH or an optionally substituted alkyl or acyl group; 
                 R 6  is hydrogen or an optionally substituted alkyl group; 
                 R 7  is hydrogen or alkyl; and 
                 —R—X 2 -Q together represent an optionally substituted alkyl moiety; 
               
             
             (c) n is 1;
           X 1  and X 2  are each C(═O);   R 1  is hydrogen, an optionally substituted alkyl or acyl group, or an optionally substituted methylene or —CH═ group bonded to the indole moiety thereby forming a tricyclic moiety;   R 2  is hydrogen, an optionally substituted alkyl or acyl group, or is absent when R 1  is —CH═ as defined above;   R 3  is hydrogen or is absent when CR 3  and CR y R z , as defined herein, are linked by a double bond;   R 4  is a moiety having the structure:   
         
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein R w , R y  and R z  are each independently hydrogen, or optionally substituted alkyl or acyl, or R z  is absent when CR 3  and CR y R z , as defined herein, are linked by a double bond; with the limitation that R y  and R z  are not simultaneously hydrogen; R x  is hydrogen or an optional substituent, or is absent when R 1  is an optionally substituted methylene or —CH═ group as defined above; Y is an optional substituent; and m is 0, 1, 2, 3 or 4; 
                 R 5  is hydrogen, OH or an optionally substituted alkyl or acyl group; 
                 R 6  is hydrogen or an optionally substituted alkyl group; 
                 R 7  is hydrogen or alkyl; and 
                 —R—X 2 -Q together represent an optionally substituted alkyl moiety or -Q′-C(O)X, wherein Q′ is an optionally substituted —CH 2 —, —CH 2 CH 2 —, —CH 2 CH 2 CH 2 —, —CH 2 CH═CH—, —CH 2 C═C— or phenylene moiety, wherein X is —OR′, —SR′ or —NR′R″ and each occurrence of R′ and R″ is independently hydrogen or optionally substituted alkyl; 
               
             
             (d) n is 1;
           X 1  is C═O;   R 1  is methyl;   R 2  and R 3 , taken together, form a piperidine moiety;   R 4  and R 5  are each hydrogen,   R 6  is —CH(CH 3 )CH 2 CH 3 ;   R 7  is —CH 2 OC(═O)CH 2 CH(CH 3 ) 2 , —CH 2 OC(═O)CH 2 CH 2 CH 3  or —CH 2 OC(═O)CH 2 CH 3 ; and   —R—X 2 -Q together represent the moiety having the structure:   
         
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             (e) n is 1;
           X 1  is C═O;   R 1 , R 2 , and R 7  are each methyl;   R 3  and R 5  are each hydrogen;   R 4  and R 6  are each i-propyl; and   —R—X 2 -Q together represent the moiety having the structure:   
         
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             wherein R x  is hydrogen or 2-thiazolyl; and/or 
             (f) n is 1;
           X 1  is C═O;   R 1  and R 2  are each independently hydrogen or C 1-4 alkyl;   R 3  and R 5  are each hydrogen;   R 4  and R 6  are each i-propyl;   R 7  is methyl; and   —R—X 2 -Q together represent a moiety having the structure:   
         
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein v is 0, 1 or 2; 
                 R′ is hydrogen or C 1-4 alkyl; 
                 R″ is C 1-6 alkylamino; hydroxy; C 3-7 cycloalkylamino optionally substituted by phenyl or benzyl; arylamino; C 1-4 alkoxy; benzhydrazino; heterocyclyl optionally substituted with one to three substituents selected from the group consisting of benzyl, benzhydryl, alkyl, hydroxy, alkoxy, alkylcarbamoyloxy, amino, mono- or di-alkylamino, acylamino, alkoxycarbonylamino, phenyl or halogen; heterocyclylamino; heterocycloalkylamino with the heterocyclyc group optionally substituted with one to three substituents selected from the group consisting of benzyl, benzhydryl, alkyl, hydroxy, alkoxy, alkylcarbamoyloxy, amino, di-alkylamino, acylamino, alkoxycarbonylamino or halogen; aralkyloxy or aralkyl both optionally substituted with one to three substituents selected from the group consisting of halogen, alkoxyxarbonyl, sulfamoyl, alkylcarbonyloxy, cyano, mono- or di-alkylamino, alkyl, alkoxy, phenyl, phenoxy, trifluoromethyl, trifluoromethoxy, alkylthio, hydroxy, alkoxycarbonylamino, heterocyclyl, 1,3-dioxolyl, 1,4-dioxolyl, amino, aminosulfonyl or benzyl; or aralkylamino having C 1-4 alkylene and the aryl group optionally substituted with one to three substituents selected from the group consisting of halogen, alkoxyxarbonyl, sulfamoyl, alkylcarbonyloxy, carbamoyloxy, cyano, mono- or di-alkylamino, alkyl, alkoxy, phenyl, phenoxy, trifluoromethyl, trifluoromethoxy, alkylthio, hydroxy, alkoxycarbonylamino, heterocyclyl, 1,3-dioxolyl, 1,4-dioxolyl, amino or benzyl; and 
                 R′″ is hydrogen, alkyl optionally substituted with one to three substituents selected from the group consisting of hydroxy, alkoxy, amino, mono- or di-alkylamino, carboxy, alkoxycarbonyl, carbamoyl, alkylcarbonyloxy, carbamoyloxy or halogen; alkenyl; alkynyl; C 3-7 cycloalkyl; aryl optionally substituted with one to three substituents selected from the group consisting of halogen, alkoxyxarbonyl, sulfamoyl, alkylcarbonyloxy, cyano, mono- or di-alkylamino, alkyl, alkoxy, phenyl, phenoxy, trifluoromethyl, trifluoromethoxy, alkylthio, hydroxy, alkoxycarbonylamino, heterocyclyl, 1,3-dioxolyl, 1,4-dioxolyl, amino or benzyl; aralkyl with the aryl group optionally substituted with one to three substituents selected from the group consisting of halogen, alkoxyxarbonyl, carbamoyl, sulfamoyl, alkylcarbonyloxy, cyano, mono- or di-alkylamino, alkyl, alkoxy, phenyl, phenoxy, trifluoromethyl, trifluoromethoxy, alkylthio, hydroxy, alkoxycarbonylamino, heterocyclyl, 1,3-dioxolyl, 1,4-dioxolyl, amino or benzyl; or heterocyclylalkyl; 
                 wherein the groups recited in paragraph (f) above are defined as follows: 
                 alkyl refers to a straight-chain or branched-chain hydrocarbon group optionally substituted with hydroxy, alkoxy, amino, mono- or di-alkylamino, acetoxy, alkylcarbonyloxy, alkoxycarbonyl, carbamoyloxy, carbamoyl or halogen; 
                 alkenyl refers to a hydrocarbon chain as defined for alkyl above having at least one double bond; 
                 alkynyl refers to a hydrocarbon chain as defined for alkyl above having at least one triple bond; 
                 C 3-7 cycloalkyl refers to a saturated, cyclic hydrocarbon group with 3-7 carbon atoms optionally substituted with alkyl, phenyl, amino, hydroxy or halogen; 
                 C 1-4 alkylene refers to a biradical linear or branched hydrocarbon chain containing 1-4 carbon atoms; 
                 Aralkyl, refers to an aryl group attached to an alkylene group; 
                 Heterocyclyl refers to saturated, unsaturated or aromatic monovalent cyclic radical having one to three heteroatoms selected from O, N and S, or combination thereof, optionally substituted with one or more occurrences of benzyl, benzhydryl, alkyl, hydroxy, alkoxy, alkylcarbamoyloxy, amino, mono- or di-alkylamino, acylamino, alkoxycarbonylamino or halogen; 
                 Amino refers to —NH 2  and includes amino groups which are further substituted by lower alkyl groups, or nitrogen protecting groups know in the art; 
                 Cycloalkylamino refers to cycloalkyl groups as defined above attached to a structure via an amino radical; 
                 Arylamino is defined as aryl-NH—; 
                 Aralkylamino is defined as aralkyl-NH—; 
                 Carbamoyl refers to the group —C(═O)—NH 2 ; 
                 Carbamoyloxy refers to the group —O—C(═O)—NH—; 
                 Alkylcarbamoyloxy refers to the group —O—C(═O)—NH-alkyl; 
                 Alkylcarbonyloxy refers to the group —O—C(═O)-alkyl; 
                 Aralkyloxy refers to the group —O-aralkyl; and 
                 Alkylthio refers to the group Alkyl-S—. 
               
             
           
         
       
    
     In certain other embodiments of compounds described in (a) above and compounds as described in certain classes and subclasses herein, the following groups do not occur simultaneously as defined:
         n is 1; X 1  and X 2  are each C(═O); R 1  and R 2  are each independently hydrogen, methyl, ethyl, propyl, n-butyl, acetyl; or R 1  and R 2 , taken together, form a moiety selected from the group consisting of cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl; R 3  is hydrogen; R 4  is —CR 4a R 4b R 4c  wherein R 4a  and R 4b  are each independently methyl, ethyl, n-propyl or n-butyl; or R 4a  and R 4b , taken together, form a moiety selected from the group consisting of β-cyclopropyl, β-cyclobutyl, β-cyclopentyl, and β-cyclcohexyl; and R 4c  is phenyl, naphtyl, anthracyl or pyrrolyl; R 5  and R 7  are each independently hydrogen or methyl; R 6  is a three to six carbon, branched alkyl group; and —R—X 2 -Q together represent the moiety having the structure:       

     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein R′ is methyl, ethyl, n-propyl, isopropyl, tert-butyl, iso-butyl, or sec-butyl; 
               
             
             R″ is hydrogen, methyl, ethyl, propyl, iso-propyl, n-butyl, iso-butyl or sec-butyl; and Q is OH or OR G  wherein R G  is a linear or branched one to six carbon alkyl group. 
           
         
       
    
     In certain other embodiments of compounds described in (a) above and compounds as described in certain classes and subclasses herein, the following groups do not occur simultaneously as defined:
         n is 1; X 1  and X 2  are each C(═O); R 1 , R 3  and R 5  are each hydrogen; R 2  is methyl; R 4  is —CR 4a R 4b R 4c , R 6  is tert-butyl; and —R—X 2 -Q together represent the moiety having the structure:       

     
       
         
         
             
             
         
       
         
         
           
             wherein R′ is isopropyl; R″ is methyl; and Q is OH; and
           (a) R 4a  and R 4b  are each methyl; R 4c  is methyl or phenyl; and R 7  is hydrogen or methyl;   (b) R 4a  and R 4b  are each methyl; R 4c  is hydrogen; and R 7  is methyl; or   (c) R 4a  and R 4b  are each hydrogen; R 4c  is phenyl; and R 7  is methyl.   
         
           
         
       
    
     In certain other embodiments, compounds of formula (I) and compounds described in classes and subclasses herein, do not have the structure of any one or more of the compounds disclosed on page 8 line 28 through page 25 line 9, page 28 line 1 through page 32 line 9 and page 39 line 16 through page 80 line 20 of WO 03/008378, which is incorporated herein by reference in its entirety. 
     In certain other embodiments, compounds of formula (I) and compounds described in classes and subclasses herein, do not have the structure of any one or more of the compounds disclosed on page 10 line 24 through page 17 line 18, page 17 line 26 through page 19 line 3, page 19 line 10 through page 20 line 3, page 20 line 17 through page 21 line 9, page 21 lines 14-29, page 22 lines 1-12, page 22 lines 16-18, page 22 lines 22-27, page 23 line 1 through page 24 line 21, page 24 line 26 through page 25 line 9, and page 28 line 1 through page 32 line 9 of WO 03/008378. 
     In certain other embodiments, compounds of formula (I) and compounds described in classes and subclasses herein, do not have the structure of any one or more of the compounds disclosed in Nieman J. et al., “Synthesis and Antitumotic/Cytotoxic Activity of Hemiasterlin Analogues”,  Journal of Natural Products,  2003, 66(2):183-199, which is incorporated herein by reference in its entirety. 
     In certain embodiments, compounds of formula (I) and compounds described in classes and subclasses herein, do not have any one or more of the following structure: 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     In certain other embodiments, compounds of formula (I) are defined as follows:
         X 1  and X 2  are each independently CHR A R B , SO 2  or C═O; wherein R A  and R B  are each independently hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   R 1  and R 2  are each independently hydrogen, or a linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, lower heteroalkyl or acyl moiety, or an aryl or heteroaryl moiety; wherein the alkyl, heteroalkyl, and aryl moieties may be substituted or unsubstituted; or   R 1  and R 2 , taken together, may form a saturated or unsaturated, substituted or unsubstituted cyclic ring of 5 to 8 atoms;   each occurrence of R 3  and R 4  is independently hydrogen, or a linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, lower heteroalkyl, lower-alkyl(aryl), lower-heteroalkyl(aryl) moiety, or an aryl or heteroaryl moiety; wherein the alkyl, heteroalkyl, -alkyl(aryl), heteroalkyl(aryl), aryl and heteroaryl moieties may be substituted or unsubstituted; or   R 3  and R 4 , taken together, may form a saturated or unsaturated, substituted or unsubstituted cyclic ring of 3 to 8 atoms;   the carbon atom bearing R 3  and R 4  may be of S configuration;   n is 1;   R 5  is hydrogen or a protecting group; wherein the protecting group may be a nitrogen protecting group;   R 6  is hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or heteroalkyl; or a substituted or unsubstituted aryl or heteroaryl moiety;   the carbon atom bearing R 6  may be of S configuration;   R 7  is hydrogen, or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or heteroalkyl; or a substituted or unsubstituted aryl or heteroaryl moiety; or R 7  may be absent when NR 7  is linked to R via a double bond;   R is a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated alkyl moiety; or a heteroaliphatic moiety containing 1-10 carbon atoms, 1 to 4 nitrogen atoms, 0 to 4 oxygen atoms and 0 to 4 sulfur atoms; whereby the heteroaliphatic moiety may be substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated;   wherein (i) the alkyl moiety may have the structure:       

     
       
         
         
             
             
         
       
         
         
           
             wherein R 8a , R 9a  and R 10a  are each independently absent, hydrogen, or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or heteroalkyl; or a substituted or unsubstituted aryl or heteroaryl moiety; wherein any two R 7 , R 8a , R 9a  and R 10a  groups may form a substituted or unsubstituted, saturated or unsaturated cyclic alkyl, heteroalkyl, alky(aryl) or heteroalkyl(aryl) moiety, or an aryl or heteroaryl moiety; and wherein the carbon atom bearing R 8a  may be of S configuration; 
             (ii) the heteroalkyl moiety may have the structure: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein R 8b , R 9b , R 10b  and R 11b  are each independently absent, hydrogen, or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl or acyl; or a substituted or unsubstituted aryl or heteroaryl moiety; wherein any two R 7 , R 8b , R 9b , R 10b  and R 11b  groups may form a substituted or unsubstituted, saturated or unsaturated cyclic alkyl, heteroalkyl, alky(aryl) or heteroalkyl(aryl) moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; wherein NR 7  and CR 8b , CR 8b  and CR 9b , CR 9b  and NR 10b , and NR 10b  and CR 11b  are each independently linked by a single or double bond as valency permits; and wherein the carbon atom bearing R 8b  may be of S configuration; 
               
             
             (iii) or the heteroalkyl moiety may have the structure: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein R 8c , R 9c , R 10c , R 11c  and R 12c  are each independently absent, hydrogen, or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or heteroalkyl; or a substituted or unsubstituted aryl or heteroaryl moiety; wherein any two R 7 , R 8c , R 9c , R 10c , R 11c  and R 12c  groups may form a substituted or unsubstituted, saturated or unsaturated cyclic alkyl, heteroalkyl, alky(aryl) or heteroalkyl(aryl) moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; wherein NR 7  and CR 8c , CR 8c  and CR 9c , CR 9c  and CR 10c  CR 10c  and CR 11c  are each independently linked by a single or double bond as valency permits; and wherein the carbon atom bearing R 8c  may be of S configuration; and 
               
             
             Q is OR Q′ , SR Q′ , NR Q′ R Q″ , wherein R Q′  and R Q″  are each independently hydrogen or a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or wherein R Q′  and R Q″ , taken together, may form a substituted or unsubstituted, saturated or unsaturated cyclic alkyl or heteroalkyl moiety or a substituted or unsubstituted aryl or heteroaryl moiety; and 
             pharmaceutically acceptable derivatives thereof. 
           
         
       
    
     In certain embodiments, the present invention defines certain classes of compounds which are of special interest. For example, one class of compounds of special interest includes those compounds having the structure of formula (I) in which R is —CH(R 8a )C(R 9a )═C(R 10a )— and the compound has the structure (Ia): 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 -R 7 , X 1 , X 2 , Q and n are defined in classes and subclasses herein; 
             R 8a , R 9a  and R 10a  are each independently hydrogen, or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and wherein any two R 7 , R 8a , R 9a  and R 10a  groups may form a substituted or unsubstituted, saturated or unsaturated alicyclic, heteroalicyclic, alicyclic(aryl), heteroalicyclic(aryl), alicyclic(heteroaryl) or heteroalicyclic(heteroaryl) moiety, or an aryl or heteroaryl moiety. 
           
         
       
    
     Another class of compounds of special interest, herein referred to as class (Ib), consists of compounds having the structure of formula (I) in which X 2  is C═O and R is a heteroaliphatic moiety containing 1-10 carbon atoms, 1 to 4 nitrogen atoms, 0 to 4 oxygen atoms and 0 to 4 sulfur atoms, whereby the heteroaliphatic moiety may be substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated. 
     Another class of compounds of special interest consists of compounds having the structure of formula (I) in which X 1  is C═O; n is 1; R 1  and R 4 , taken together, form a cyclic heterocyclic or heteroaryl moiety; R 3  is hydrogen or is absent when the carbon atom bearing R 3  is linked to N or E via a double bond; and the compound has the structure (Ic): 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 2 , R 5 -R 7 , R, X 2  and Q are defined in classes and subclasses herein; 
             each occurrence of G, J, L and M is independently CHR iv , CR iv R v , O, S, NR iv R v , wherein each occurrence of R iv  and R v  is independently absent, hydrogen, —C(═O)R vi , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; or wherein any two adjacent R 2 , R iv , R v  or R vi  groups, taken together, form a substituted or unsubstituted, saturated or unsaturated alicyclic or heteroalicyclic moiety containing 3-6 atoms or an aryl or heteroaryl moiety; wherein each occurrence of R vi  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; 
             N and G, G and J, J and L, L and M, M and CR 3 , and CR 3  and N are each independently linked by a single or double bond as valency permits; and 
             g, j, l and m are each independently 0, 1, 2, 3, 4, 5 or 6, wherein the sum of g, j, l and m is 3-6. 
           
         
       
    
     Another class of compounds of special interest consists of compounds having the structure of formula (I) in which X 1  is C═O; n is 1; R 3  and R 4  are each independently an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or, when taken together, form an alicyclic, heteroalicyclic, alicyclic(aryl), heteroalicyclic(aryl), alicyclic(heteroaryl) or heteroalicyclic(heteroaryl) moiety; and the compound has the structure (Id): 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 , R 2 , R 5 -R 7 , R, X 2  and Q are defined in classes and subclasses herein. 
           
         
       
    
     The following structures illustrate several exemplary types of compounds of class (Ia). Additional compounds are described in the Exemplification herein. 
     
       
         
         
             
             
         
       
     
     The following structures illustrate several exemplary types of compounds of class (Ib). Additional compounds are described in the Exemplification herein. 
     
       
         
         
             
             
         
       
     
     The following structures illustrated several exemplary types of compounds of class (Ic). Additional compounds are described in the Exemplification herein. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     The following structures illustrate several exemplary types of compounds of class (Id). Additional compounds are described in the Exemplification herein. 
     
       
         
         
             
             
         
       
     
     Other compounds of the invention will be readily apparent to the reader. 
     A number of important subclasses of each of the foregoing classes deserve separate mention; for example, one important subclass of class (Ia) includes those compounds having the structure of formula (Ia) in which X 2  is C═O; and the compound has the following structure: 
                         
wherein R 1 -R 7 , n and Q are defined in classes and subclasses herein;
         R 8a , R 9a  and R 10a  are each independently hydrogen, or an alkyl, heteroalkyl, aryl or heteroaryl moiety; and wherein any two R 7 , R 8a , R 9a  and R 10a  groups may form a cyclic alkyl, heteroalkyl, -alkyl(aryl), -heteroalykl(aryl), -alkyl(heteroaryl) or -heteroalkyl(heteroaryl) moiety, or an aryl or heteroaryl moiety; and   X 1  is CR A R B , SO 2  or C═O; wherein R A  and R B  are each independently hydrogen, alkyl, heteroalkyl, aryl or heteroaryl.       
     Another important subclass of class (Ia) includes those compounds having the structure of formula (Ia) in which X 1  is C═O; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 -R 7 , n and Q are defined in classes and subclasses herein; 
             R 8a , R 9a  and R 10a  are each independently hydrogen, or an alkyl, heteroalkyl, aryl or heteroaryl moiety; and wherein any two R 7 , R 8a , R 9a  and R 10a  groups may form a cyclic alkyl, heteroalkyl, -alkyl(aryl), -heteroalykl(aryl), -alkyl(heteroaryl) or -heteroalkyl(heteroaryl) moiety, or an aryl or heteroaryl moiety; and 
             X 2  is CR A R B , SO 2  or C═O; wherein R A  and R B  are each independently hydrogen, alkyl, heteroalkyl, aryl or heteroaryl. 
           
         
       
    
     Another important subclass of class (Ia) includes those compounds having the structure of formula (Ia) in which X 1  and X 2  are each C═O; n is 1; R 3  is hydrogen; R 4  is a moiety having the structure —CR 4a R 4b R 4c ; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 -R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; and 
             R 4a  and R 4b  are each independently hydrogen or lower alkyl or heteroalkyl, and R 4c  is aryl or heteroaryl; and 
             R 8a , R 9a  and R 10a , are each independently hydrogen, or an alkyl, heteroalkyl, aryl or heteroaryl moiety; and wherein any two R 7 , R 8a , R 9a  and R 10a  groups may form a cyclic alkyl, heteroalkyl, -alkyl(aryl), -heteroalykl(aryl), -alkyl(heteroaryl) or -heteroalkyl(heteroaryl) moiety, or an aryl or heteroaryl moiety. 
           
         
       
    
     Another important subclass of class (Ia) includes those compounds having the structure of formula (Ia) in which X 1  and X 2  are each C═O; Q is an optionally substituted nitrogen-containing cyclic moiety; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 -R 7  and n are defined in classes and subclasses herein; 
             R 8a , R 9a  and R 10a  are each independently hydrogen, or an alkyl, heteroalkyl, aryl or heteroaryl moiety; and wherein any two R 7 , R 8a , R 9a  and R 10a  groups may form a cyclic alkyl, heteroalkyl, -alkyl(aryl), -heteroalykl(aryl), -alkyl(heteroaryl) or -heteroalkyl(heteroaryl) moiety, or an aryl or heteroaryl moiety; 
             each occurrence of A, B, D or E is independently CHR i , CR i R ii , O, S, NR i R ii , wherein each occurrence of R i  and R ii  is independently absent, hydrogen, —C(═O)R iii , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; or wherein any two adjacent R i , R ii  or R iii  groups, taken together, form a alicyclic or heteroalicyclic moiety containing 3-6 atoms or an aryl or heteroaryl moiety; wherein each occurrence of R iii  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; 
             N and A, A and B, B and D, D and E, and E and N are each independently linked by a single or double bond as valency permits; and 
             a, b, d and e are each independently 0, 1, 2, 3, 4, 5, 6 or 7, wherein the sum of a, b, d and e is 4-7. 
           
         
       
    
     Another important subclass of class (Ia) includes those compounds having the structure of formula (Ia) in which X 1  and X 2  are each C═O; Q is an optionally substituted nitrogen-containing cyclic moiety; n is 1; R 3  is hydrogen; R 4  is a moiety having the structure —CR 4a R 4b R 4c ; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 , R 2 , R 5 -R 7 , A, B, D, E, a, b, d and e are defined in classes and subclasses herein; 
             R 4a  and R 4b  are each independently hydrogen or lower alkyl or heteroalkyl, and R 4c  is a substituted or unsubstitued aryl or heteroaryl group; 
             R 8a , R 9a  and R 10a  are each independently hydrogen, or an alkyl, heteroalkyl, aryl or heteroaryl moiety; and wherein any two R 7 , R 8a , R 9a  and R 10a  groups may form a cyclic alkyl, heteroalkyl, -alkyl(aryl), -heteroalykl(aryl), -alkyl(heteroaryl) or -heteroalkyl(heteroaryl) moiety, or an aryl or heteroaryl moiety. 
           
         
       
    
     A number of important subclasses of each of the foregoing subclasses of class (Ia) deserve separate mention; these subclasses include subclasses of the foregoing subclasses of class (Ia) in which:
         i-a. R 1  and R 2  are independently hydrogen or substituted or unsusbtituted, linear or branched, cyclic or a cyclic, saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl;   ii-a. R 1  is hydrogen and R 2  is substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl;   iii-a. R 1  is hydrogen and R 2  is substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl;   iv-a. R 1  is hydrogen and R 2  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , —C(CH 3 ) 2 C≡CH, cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl;   v-a. R 1  and R 2  are each hydrogen;   vi-a. The carbon atom bearing R 3  and R 4  is of S configuration;   vii-a. R 3  is hydrogen and R 4  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl or -alkyl(aryl) or substituted or unsubstituted aryl or heteroaryl;   viii-a. R 3  is hydrogen and R 4  is —CR 4a R 4b R 4c ; wherein R 4a  and R 4b  are independently hydrogen, or a substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl moiety and R 4c  is substituted or unsubstituted aryl or heteroaryl;   ix-a. R 3  is hydrogen and R 4  is —CR 4a R 4b Ph; wherein R 4a  and R 4b  are independently hydrogen, or a substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl moiety;   x-a. R 4  is a substituted or unsubstituted 3-indole moiety;   xi-a. R 3  is hydrogen;   xii-a. R 1  and R 4 , taken together, form a substituted or unsubstituted pyrrolidine group;   xiii-a. R 1  and R 4 , taken together, form a substituted or unsubstituted piperidine group;   xiv-a. R 1  and R 4 , taken together, form a substituted or unsubstituted thiazolidine group;   xv-a. R 1  and R 4 , taken together, form a substituted or unsubstituted morpholine group;   xvi-a. R 1  and R 4 , taken together, form a substituted or unsubstituted thiomorpholine group;   xvii-a. R 1  and R 4 , taken together, form a substituted or unsubstituted indole group;   xviii-a. R 3  and R 4  are each independently substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl or -alkyl(aryl) or substituted or unsubstituted aryl or heteroaryl;   xix-a. R 3  and R 4  are each independently substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, -alkyl(aryl) or substituted or unsubstituted aryl;   xx-a. R 3  and R 4  are each independently substituted or unsubstituted lower alkyl, aryl or heteroaryl;   xxi-a. R 3  and R 4  are each independently methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , cyclohexyl, cyclopentyl, cyclobutyl, cyclopropyl, phenyl, —C 1-6 alkylOR a , —C 1-6 alkylSR a  or —CR a R b R c ; wherein R a  and R b  are independently hydrogen, substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl and R c  is substituted or unsubstituted aryl or heteroaryl;   xxii-a. R 3  and R 4  are each independently methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , cyclohexyl, cyclopentyl, cyclobutyl, cyclopropyl, phenyl, —C 1-6 alkylOR a , —C 1-6 alkylSR a  or —CR b R c Ph; wherein R a  is hydrogen, substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl and R b  And R c  are each independently substituted or unsubstituted linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   xxiii-a. R 3  and R 4  are each ethyl;   xxiv-a. R 3  is phenyl and R 4  is lower alkyl;   xxv-a. R 3  is phenyl and R 4  is ethyl;   xxvi-a. R 3  and R 4 , taken together, form a substituted or unsubstituted cycloalkyl group;   xxvii-a. R 3  and R 4 , taken together, form a cyclohexyl group;   xxviii-a. R 3  and R 4 , taken together, form a substituted or unsubstituted cycloalkyl(aryl) group;   xxix-a. R 5  is hydrogen;   xxx-a. R 6  is substituted or unsubstituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl;   xxxi-a. R 6  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl;   xxxii-a. R 6  is tert-butyl;   xxxiii-a. The R 6 -bearing carbon atom is of S configuration;   xxxiv-a. R 7  is substituted or unsubstituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl;   xxxv-a. R 7  is methyl;   xxxvi-a. —[C(R 3 )(R 4 )] n N(R 1 )(R 2 ) together represent the moiety having the structure:       

     
       
         
         
             
             
         
       
         
         
           
             
               
                 a) R 2  is hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl moiety; 
                 b) R 2  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , —C(CH 3 ) 2 C≡CH, cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl; 
                 c) R 2  is methyl, ethyl, propyl or i-propyl; 
                 d) R G1  is hydrogen, substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or substituted or unsubstituted phenyl; 
                 e) R G1  is hydrogen, methyl or phenyl; 
                 f) R G1  and the substituents on L, taken together, form a substituted or unsubstituted phenyl group; 
                 g) R M1  and R M2  are each independently hydrogen, hydroxyl, a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl moiety; a substituted or unsubstituted phenyl moiety, or R M2  is absent when R M1  and the substitutents on L, taken together, form a substituted or unsubstituted aryl or heteroaryl moiety; 
                 h) R M1  and R M2  are each hydrogen; 
                 i) g is 1 or 2; and/or 
                 j) L is CH 2 , S or O; 
               
             
             xxxvii-a. —[C(R 3 )(R 4 )] n N(R 1 )(R 2 ) together represent the moiety having the structure: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 a) R 2  is hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl moiety; 
                 b) R 2  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , C(CH 3 ) 2 C≡CH, cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl; 
                 c) R 2  is methyl, ethyl, propyl or i-propyl; 
                 d) R L1  and R L2  are each independently hydrogen, substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or substituted or unsubstituted phenyl; 
                 e) R L1  and R L2  are each hydrogen; 
                 f) R L1  and R L2  are each substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl; or 
               
             
             g is 1 or 2; 
             xxxvi-a. R is —CH(R 8a )C(R 9a )═C(R 10a )—; and
           a) R 8a  is substituted or unsubstituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl;   b) R 8a  is iso-propyl;   c) The R 8a -bearing carbon atom is of S configuration;   d) R 9a  is hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl;   e) R 9a  is hydrogen;   f) R 10a  is hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl;   g) R 10a  is methyl;   
         
             xxxvii-a. n is 1; 
             xxxviii-a. X 1  is C═O; 
             xxxix-a. X 1  is CH 2 ; 
             xl-a. X 1  is SO 2 ; 
             xli-a. X 2  is C═O; 
             xlii-a. X 2  is CH 2 ; 
             xliii-a. X 2  is SO 2 ; 
             xliv-a. Q is OR Q′ , SR Q′ , NR Q′ R Q″ , N 3 , ═N—OH, or a moiety selected from the group consisting of: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             wherein each occurrence of r is 0, 1 or 2; s and t are independently an integer from 0-8; X is O, S, or NR K ; each occurrence of R Q1  and R Q2  is independently hydrogen, halogen, —CN, —S(O) h R J , —NO 2 , —COR J , —CO 2 R J , —NR J COR J , —NR J CO 2 R J , —CONR J R J , —CO(NOR J )R J , aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or -Z 1 R J ; wherein h is 1 or 2; and Z 1  is independently —O—, —S—, NR K , —C(O)—, wherein each occurrence of R J  and R K  is independently hydrogen, COR L , COOR L , CONR L R M , —NR L R M , —S(O) 2 R L , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, and wherein each occurrence of R L  and R M  is independently hydrogen, or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and R Q′  and R Q″  are independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic, aryl or heteroaryl moiety; and 
             xlv-a. Q is OR Q′ , SR Q′ , NR Q′ R Q″ , N 3 , ═N—OH, or a moiety selected from the group consisting of: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein each occurrence of r is 0, 1 or 2; s and t are independently an integer from 0-8; each occurrence of R Q1  and R Q2  is independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q1  and R Q2 , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic moiety; and R Q′  and R Q″  are independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic, aryl or heteroaryl moiety; and/or 
               
             
           
         
         xliv-a. Q is OR Q′ , SR Q′ , NR Q′ R Q″ , N 3 , ═N—OH, or a moiety selected from the group consisting of: 
       
    
     
       
         
         
             
             
         
       
         
         
           
             wherein each occurrence of r is 0, 1 or 2; and R Q′  and R Q″  are independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic, aryl or heteroaryl moiety. 
           
         
       
    
     An important subclass of class (Ib) includes those compounds having the structure of formula (Ib) in which R is —C(R 8b )C(R 9b )N(R 10b )C(R 11b )—; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 -R 7 , n, X 1  and Q are defined in classes and subclasses herein; 
             R 8b , R 9b , R 10b  and R 11b  are each independently absent, hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein any two R 8b , R 9b , R 10b  and R 11b  groups, taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8b , CR 8b  and CR 9b , CR 9b  and NR 10b , NR 10b  and CR 11b  are each independently linked by a single or double bond as valency permits. 
           
         
       
    
     Another important subclass of class (Ib) includes those compounds having the structure of formula (Ib) in which X 1  is C═O; R is —C(R 8b )C(R 9b )N(R 10b )C(R 11b )—; n is 1; R 3  is hydrogen; R 4  is a moiety having the structure —CR 4a R 4b R 4c ; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 -R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; and 
             R 4a  and R 4b  are each independently hydrogen or lower alkyl and R 4c  is aryl or heteroaryl; 
             R 8b , R 9b , R 10b  and R 11b  are each independently absent, hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein any two R 8b , R 9b , R 10b  and R 11b  groups, taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8b , CR 8b  and CR 9b , CR 9b  and NR 10b , NR 10b  and CR 11b  are each independently linked by a single or double bond as valency permits. 
           
         
       
    
     Another important subclass of class (Ib) includes those compounds having the structure of formula (Ib) in which R is —C(R 8b )C(R 9b )N(R 10b )C(R 11b )—; R 10b  and R 11b , taken together, form a substituted or unsubstituted cyclic heteroalkyl or heteroaryl moiety; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 -R 7 , n and Q are defined in classes and subclasses herein; 
             p is 1, 2, 3 or 4; 
             q is 0-12; 
             each occurrence of S 1  is independently an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or any two adjacent S 1  moieties, taken together, may form an an alicyclic, heteroalicyclic, aryl or heteroaryl moiety; 
             R 8b  and R 9b  are each independently absent, hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein R 8b  and R 9b , taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8 , and CR 8b  and CR 9b  are each independently linked by a single or double bond as valency permits. 
           
         
       
    
     Another important subclass of class (Ib) includes those compounds having the structure of formula (Ib) in which n is 1; R is —C(R 8b )C(R 9b )N(R 10b )C(R 11b )—; R 10b  and R 11b , taken together, form a substituted or unsubstituted cyclic heteroalkyl or heteroaryl moiety; R 4  is a moiety having the structure —CR 4a R 4b R 4c ; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 -R 7 , X 1  and Q are defined in classes and subclasses herein; 
             p is 1, 2, 3 or 4; 
             is 0, 1, 2, 3, 4, 5 or 6; 
             each occurrence of S 1  is independently an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or any two adjacent S 1  moieties, taken together, may form an an alicyclic, heteroalicyclic, aryl or heteroaryl moiety; 
             R 4a  and R 4b  are each independently hydrogen or lower alkyl or heteroalkyl; and R 4c  is aryl or heteroaryl; 
             R 8b  and R 9b  are each independently hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein R 8b  and R 9b , taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8b , and CR 8b  and CR 9b  are each independently linked by a single or double bond as valency permits. 
           
         
       
    
     Another important subclass of class (Ib) includes those compounds having the structure of formula (Ib) in which R is —C(R 8c )C(R 9c )C(R 10c )C(R 11c )OC(R 12c )—; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 -R 7 , n, X 1  and Q are defined in classes and subclasses herein; 
             R 8c , R 9c , R 10c , R 11c  and R 12c  are each independently absent, hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein any two R 8c , R 9c , R 10c , R 11c  and R 12c  groups, taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8c , CR 8c  and CR 9c , CR 9c  and CR 10c , and CR 10c  and CR 11c  are each independently linked by a single or double bond as valency permits. 
           
         
       
    
     Another important subclass of class (Ib) includes those compounds having the structure of formula (Ib) in which X 1  is C═O; n is 1; R 3  is hydrogen; R 4  is a moiety having the structure —CR 4a R 4b R 4c ; R is —C(R 8c )C(R 9c )C(R 10c )C(R 11c )OC(R 12c )—; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 , R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; 
             R 4a  and R 4b  are each independently hydrogen, or lower alkyl or heteroalkyl; and R 4c  is aryl or heteroaryl; 
             R 8c , R 9c , R 10c , R 11c  and R 12c  are each independently absent, hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein any two R 8c , R 9c , R 10c , R 11c  and R 12c  groups, taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8c , CR 8c  and CR 9c , CR 9c  and CR 10c , and CR 10c  and CR 11c  are each independently linked by a single or double bond as valency permits. 
           
         
       
    
     A number of important subclasses of each of the foregoing subclasses of class (Ib) deserve separate mention; these subclasses include subclasses of the foregoing subclasses of class (Ib) in which:
         i-b. R 1  and R 2  are independently hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl;   ii-b. R 1  is hydrogen and R 2  is substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl;   iii-b. R 1  is hydrogen and R 2  is substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl;   iv-b. R 1  is hydrogen and R 2  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , —C(CH 3 ) 2 C≡CH, cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl;   v-b. R 1  and R 2  are each hydrogen;   vi-b. The carbon atom bearing R 3  and R 4  is of S configuration;   vii-b. R 3  is hydrogen and R 4  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl or -alkyl(aryl) or substituted or unsubstituted aryl or heteroaryl;   viii-b. R 3  is hydrogen and R 4  is —CR 4a R 4b R 4c ; wherein R 4a  and R 4b  are independently hydrogen, or a substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl moiety and R 4c  is substituted or unsubstituted aryl or heteroaryl;   ix-b. R 3  is hydrogen and R 4  is —CR 4a R 4b Ph; wherein R 4a  and R 4b  are independently hydrogen, or a substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl moiety;   x-b. R 4  is a substituted or unsubstituted 3-indole moiety;   xi-b. R 3  is hydrogen;   xii-b. R 1  and R 4 , taken together, form a substituted or unsubstituted pyrrolidine group;   xiii-b. R 1  and R 4 , taken together, form a substituted or unsubstituted piperidine group;   xiv-b. R 1  and R 4 , taken together, form a substituted or unsubstituted thiazolidine group;   xv-b. R 1  and R 4 , taken together, form a substituted or unsubstituted morpholine group;   xvi-b. R 1  and R 4 , taken together, form a substituted or unsubstituted thiomorpholine group;   xvii-b. R 1  and R 4 , taken together, form a substituted or unsubstituted indole group;   xviii-b. R 3  and R 4  are each independently substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl or -alkyl(aryl) or substituted or unsubstituted aryl or heteroaryl;   xix-b. R 3  and R 4  are each independently substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, -alkyl(aryl) or substituted or unsubstituted aryl;   xx-b. R 3  and R 4  are each independently substituted or unsubstituted lower alkyl, aryl or heteroaryl;   xxi-b. R 3  and R 4  are each independently methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , cyclohexyl, cyclopentyl, cyclobutyl, cyclopropyl, phenyl, —C 1-6 alkylOR a , —C 1-6 alkylSR a  or —CR a R b R c ; wherein R a  and R b  are independently hydrogen, substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl and R c  is substituted or unsubstituted aryl or heteroaryl;   xxii-b. R 3  and R 4  are each independently methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , cyclohexyl, cyclopentyl, cyclobutyl, cyclopropyl, phenyl, —C 1-6 alkylOR a , —C 1-6 alkylSR a  or —CR b R c Ph; wherein R a  is hydrogen, substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl and R b  And R c  are each independently substituted or unsubstituted linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   xxiii-b. R 3  and R 4  are each ethyl;   xxiv-b. R 3  is phenyl and R 4  is lower alkyl;   xxv-b. R 3  is phenyl and R 4  is ethyl;   xxvi-b. R 3  and R 4 , taken together, form a substituted or unsubstituted cycloalkyl group;   xxvii-b. R 3  and R 4 , taken together, form a cyclohexyl group;   xxviii-b. R 3  and R 4 , taken together, form a substituted or unsubstituted cycloalkyl(aryl) group;   xxix-b. R 5  is hydrogen;   xxx-b. R 6  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   xxxi-b. R 6  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl;   xxxii-b. R 6  is tert-butyl;   xxxiii-b. The R 6 -bearing carbon atom is of S configuration;   xxxiv-b. R 7  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   xxxv-b. R 7  is methyl;   xxxvi-b. —[C(R 3 )(R 4 )] n N(R 1 )(R 2 ) together represent the moiety having the structure:       

     
       
         
         
             
             
         
       
         
         
           
             
               
                 b) R 2  is hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl moiety; 
                 c) R 2  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , —C(CH 3 ) 2 C≡CH, cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl; 
                 d) R 2  is methyl, ethyl, propyl or i-propyl; 
                 e) R G1  is hydrogen, substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or substituted or unsubstituted phenyl; 
                 f) R G1  is hydrogen, methyl or phenyl; 
                 g) R G1  and the substituents on L, taken together, form a substituted or unsubstituted phenyl group; 
                 h) R M1  and R M2  are each independently hydrogen, hydroxyl, a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl moiety; a substituted or unsubstituted phenyl moiety, or R M2  is absent when R M1  and the substitutents on L, taken together, form a substituted or unsubstituted aryl or heteroaryl moiety; 
                 i) R M1  and R M2  are each hydrogen; 
                 j) g is 1 or 2; and/or 
                 k) L is CH 2 , S or O; 
               
             
             xxxviii-a. —C[(R 3 )(R 4 )] n N(R 1 )(R 2 ) together represent the moiety having the structure: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 a) R 2  is hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl moiety; 
                 b) R 2  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , —C(CH 3 ) 2 C≡CH, cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl; 
                 c) R 2  is methyl, ethyl, propyl or i-propyl; 
                 d) R L1  and R L2  are each independently hydrogen, substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or substituted or unsubstituted phenyl; 
                 e) R L1  and R L2  are each hydrogen; 
                 f) R L1  and R L2  are each substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl; or 
               
             
             g is 1 or 2; 
             xxxvii-b. R is —C(R 8b )C(R 9b )N(R 10b )CR 11b — and
           a) R 8b  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   b) R 8b  is iso-propyl;   c) The R 8b -bearing carbon atom is of S configuration;   d) R 9b  is hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   e) R 10b  is hydrogen, substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or acyl;   f) R 10b  is hydrogen, methyl or acetyl;   g) R 10b  and R 11b , taken together, form a substituted or unsubstituted pyrrolidine ring; or   h) R 9b  and R 11b , taken together, form a substituted or unsubstituted thiazole ring;   
         
             xxxviii-b. R is —C(R 8c )C(R 9c )C(R 10c )CR 11c OCR 12c — and
           a) R 8c  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   b) R 8c  is iso-propyl;   c) The R 8c -bearing carbon atom is of S configuration;   d) R 9c  and R 10c  are each independently hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   e) CR 9c  and CR 10c  are linked via a double bond;   f) CR 9c  and CR 10c  are linked via a double bond and R 9c  is hydrogen; or   g) CR 9c  and CR 10c  are linked via a double bond and R 10c  is methyl;   
         
             xxxix-b. n is 1; 
             xl-b. X 1  is C═O; 
             xli-b. X 1  is CH 2 ; 
             xlii-b. X 1  is SO 2 ; 
             xliii-b. Q is OR Q′ , SR Q′ , NR Q′ R Q″ , N 3 , ═N—OH, or a moiety selected from the group consisting of: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein each occurrence of r is 0, 1 or 2; s and t are independently an integer from 0-8; X is O, S, or NR K ; each occurrence of R Q1  and R Q2  is independently hydrogen, halogen, —CN, —S(O) h R J , —NO 2 , —COR J , —CO 2 R J , —NR J COR J , —NR J CO 2 R J , —CONR J R J , —CO(NOR J )R J , aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or -Z 1 R J ; wherein h is 1 or 2; and Z 1  is independently —O—, —S—, NR K , —C(O)—, wherein each occurrence of R J  and R K  is independently hydrogen, COR L , COOR L , CONR L R M , —NR L R M , —S(O 2 R L , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, and wherein each occurrence of R L  and R M  is independently hydrogen, or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and R Q′  and R Q″  are independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic, aryl or heteroaryl moiety; 
               
             
             xliv-b. Q is OR Q′ , SR Q′ , NR Q′ R Q″ , N 3 , ═N—OH, or a moiety selected from the group consisting of: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein each occurrence of r is 0, 1 or 2; s and t are independently an integer from 0-8; each occurrence of R Q1  and R Q2  is independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q1  and R Q2 , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic moiety; and R Q′  and R Q″  are independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic, aryl or heteroaryl moiety; and/or 
               
             
             xlv-b. Q is OR Q′ , SR Q′ , NR Q′ R Q″ , N 3 , ═N—OH, or a moiety selected from the group consisting of: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein each occurrence of r is 0, 1 or 2; and R Q′  and R Q″  are independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic, aryl or heteroaryl moiety. 
               
             
           
         
       
    
     An important subclass of class (Ic) includes those compounds having the structure of formula (Ic) in which X 2  is C═O; R is —CH(R 8a )C(R 9a )═C(R 10a )—; j is 0; l and m are each 1; R 3  is hydrogen; G is CR G1 ; M is CR M1 R M2 , and the compound has the structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; 
             g is 1, 2, 3 or 4; 
             R 8a , R 9a  and R 10a  are each independently hydrogen, or an alkyl, heteroalkyl, aryl or heteroaryl moiety; and wherein any two R 7 , R 8a , R 9a  and R 10a  groups may form a cyclic alkyl, heteroalkyl, -alkyl(aryl), -heteroalykl(aryl), -alkyl(heteroaryl) or -heteroalkyl(heteroaryl) moiety, or an aryl or heteroaryl moiety; 
             L is CR L1 R L2 , S, O or NR L3 , wherein each occurrence of R L1 , R L2  and R L3  is independently hydrogen or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; 
             each occurrence of R G1 , R M1  and R M2  is each independently hydrogen or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; 
             wherein any two adjacent R L1 , R L2 , R L3 , R G1 , R M1  or R M2  groups, taken together, form a substituted or unsubstituted alicyclic or heteroalicyclic moiety containing 3-6 atoms or an aryl or heteroaryl moiety. 
           
         
       
    
     Another important subclass of class (Ic) includes those compounds having the structure of formula (Ic) in which X 2  is C═O; G, J and M are each CH 2 ; j, l and m are each 1; R is —CH(R 8a )C(R 9a )═C(R 10a )—; R 3  is hydrogen; and the compound has the structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; 
             g is 0, 1, 2 or 3; 
             R 8a , R 9a  and R 10a  are each independently hydrogen, or an alkyl, heteroalkyl, aryl or heteroaryl moiety; and wherein any two R 7 , R 8a , R 9a  and R 10a  groups may form a cyclic alkyl, heteroalkyl, -alkyl(aryl), -heteroalykl(aryl), -alkyl(heteroaryl) or -heteroalkyl(heteroaryl) moiety, or an aryl or heteroaryl moiety; 
             R L1  and R L2  are independently hydrogen or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety. 
           
         
       
    
     Another important subclass of class (Ic) includes those compounds having the structure of formula (Ic) in which X 2  is C═O; R is —C(R 8b )C(R 9b )N(R 10b )C(R 11b )—; j is 0; l and m are each 1; R 3  is hydrogen; G is CHR G1 , M is CR M1 R M2 , and the compound has the structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; 
             g is 1, 2 or 3; 
             L is CR L1 R L2 , S, O or NR L3 , wherein each occurrence of R L1 , R L2  and R L3  is independently hydrogen or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; 
             each occurrence of R G1 , R M1  and R M2  is independently hydrogen or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; 
             any two adjacent R L1 , R L2 , R L3 , R G1 , R M1  or R M2  groups, taken together, may form a substituted or unsubstituted alicyclic or heteroalicyclic moiety containing 3-6 atoms or an aryl or heteroaryl moiety; 
             R 8b , R 9b , R 10b  and R 11b  are each independently absent, hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein any two adjacent R 8b , R 9b , R 10b  and R 11b  groups, taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8b , CR 8b  and CR 9b , CR 9b  and NR 10b , NR 10b  and CR 11b  are each independently linked by a single or double bond as valency permits. 
           
         
       
    
     Another important subclass of class (Ic) includes those compounds having the structure of formula (Ic) in which X 2  is C═O; R is —C(R 8b )C(R 9b )N(R 10b )C(R 11b )—; j is 0; l and m are each 1; R 3  is hydrogen; G is CHR G1 , M is CR M1 R M2 ; R 10b  and R 11b , taken together, form a cyclic heteroalkyl group; and the compound has the structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; 
             p is 1, 2, 3 or 4; 
             q is 0-12; 
             each occurrence of S 1  is independently an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or any two adjacent S 1  moieties, taken together, may form an an alicyclic, heteroalicyclic, aryl or heteroaryl moiety; 
             R 8b  and R 9b  are each independently absent, hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein R 8b  and R 9b , taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8b , and CR 8b  and CR 9b  are each independently linked by a single or double bond as valency permits. 
           
         
       
    
     Another important subclass of class (Ic) includes those compounds having the structure of formula (Ic) in which X 2  is C═O; G, J and M are each CH 2 ; j, l and m are each 1; R is —C(R 8b )C(R 9b )N(R 10b )C(R 11b )—; R 3  is hydrogen; and the compound has the structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; 
             g is 0, 1, 2 or 3; 
             R L1  and R L2  are independently hydrogen or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; 
             R 8b , R 9b , R 10b  and R 11b  are each independently absent, hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein any two adjacent R 8b , R 9b , R 10b  and R 11b  groups, taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8b , CR 8b  and CR 9b , CR 9b  and NR 10b , NR 10b  and CR 11b  are each independently linked by a single or double bond as valency permits. 
           
         
       
    
     Another important subclass of class (Ic) includes those compounds having the structure of formula (Ic) in which X 2  is C═O; G, J and M are each CH 2 ; j, l and m are each 1; R is —C(R 8b )C(R 9b )N(R 10b )C(R 11b )—; R 3  is hydrogen; R 10b  and R 11b , taken together, form a cyclic heteroalkyl group; and the compound has the structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; 
             p is 1, 2, 3 or 4; 
             q is 0-12; 
             g is 0, 1, 2 or 3; 
             R L1  and R L2  are independently hydrogen or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; 
             each occurrence of S 1  is independently an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or any two adjacent S 1  moieties, taken together, may form an an alicyclic, heteroalicyclic, aryl or heteroaryl moiety; 
             R 8b  and R 9b  are each independently hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein R 8b  and R 9b , taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8b , and CR 8b  and CR 9b  are each independently linked by a single or double bond as valency permits. 
           
         
       
    
     Another important subclass of class (Ic) includes those compounds having the structure of formula (Ic) in which X 2  is C═O; R is —C(R 8c )C(R 9c )C(R 10c )C(R 11c )OC(R 12c )—; j is 0; l and m are each 1; R 3  is hydrogen; G is CHR G1 , M is CR M1 R M2 ; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 , R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; 
             g is 1, 2 or 3; 
             L is CR L1 R L2 , S, O or NR L3 , wherein each occurrence of R L1 , R L2  and R L3  is independently hydrogen or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; 
             each occurrence of R G1 , R M1  and R M2  is independently hydrogen or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; 
             any two adjacent R L1 , R L2 , R L3 , R G1 , R M1  or R M2  groups, taken together, may form a substituted or unsubstituted alicyclic or heteroalicyclic moiety containing 3-6 atoms or an aryl or heteroaryl moiety; 
             R 8c , R 9c , R 10c , R 11c  and R 12c  are each independently absent, hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein any two R 8c , R 9c , R 10c , R 11c  and R 12c  groups, taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8c , CR 8c  and CR 9c , CR 9c  and CR 10c , and CR 10c  and CR 11c  are each independently linked by a single or double bond as valency permits. 
           
         
       
    
     Another important subclass of class (Ic) includes those compounds having the structure of formula (Ic) in which X 2  is C═O; R is —C(R 8c )C(R 9c )C(R 10c )C(R 11c )OC(R 12c )—; G, J and M are each CH 2 ; j, l and m are each 1; R 3  is hydrogen; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 , R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; 
             g is 0, 1, 2 or 3; 
             R L1  and R L2  are independently hydrogen or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; 
             R 8c , R 9c , R 10c , R 11c  and R 12c  are each independently absent, hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein any two R 8c , R 9c , R 10c , R 11c  and R 12c  groups, taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8c , CR 8c  and CR 9c , CR 9c  and CR 10c , and CR 10c  and CR 11c  are each independently linked by a single or double bond as valency permits. 
           
         
       
    
     A number of important subclasses of each of the foregoing subclasses of class (Ic) deserve separate mention; these subclasses include subclasses of the foregoing subclasses of class (Ic) in which:
         i-c. R 2  is hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl moiety;   ii-c. R 2  is substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl;   iii-c. R 2  is substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl;   iv-c. R 2  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , —C(CH 3 ) 2 C≡CH, cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl;   v-c. R 2  is hydrogen;   vi-c. R 2  is hydrogen, methyl or benzyl;   vii-c. R 2  is methyl;   viii-c. R 2  is acyl, wherein the acyl group is a nitrogen proteting group;   ix-c. R 3  is hydrogen;   x-c. The moiety having the structure       

     
       
         
         
             
             
         
       
         
         
           
              forms a substituted or unsubstituted pyrrolidine group; 
             xi-c. The moiety having the structure 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
              forms a substituted or unsubstituted piperidine group; 
             xii-c. The moiety having the structure 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
              forms a substituted or unsubstituted thiazolidine group; 
             xiii-c. The moiety having the structure 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
              forms a substituted or unsubstituted morpholine group; 
             xiv-c. The moiety having the structure 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
              forms a substituted or unsubstituted thiomorpholine group; 
             xv-c. The moiety having the structure 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
              forms a substituted or unsubstituted indole group; 
             xvi-c. R 5  is hydrogen; 
             xvii-c. R 6  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl; 
             xviii-c. R 6  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl; 
             xix-c. R 6  is tert-butyl; 
             xx-c. The R 6 -bearing carbon atom is of S configuration; 
             xxi-c. R 7  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl; 
             xxii-c. R 7  is methyl; 
             xxiii-c. R is —CH(R 8a )C(R 9a )═C(R 10a )—; and
           a) R 8a  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   b) R 8a  is iso-propyl;   c) The R 8a -bearing carbon atom is of S configuration;   d) R 9a  is hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   e) R 9a  is hydrogen;   f) R 10a  is hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl; or   g) R 10a  is methyl;   
         
             xxiv-c. R is —C(R 8b )C(R 9b )N(R 10b )CR 11b — and
           a) R 8b  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   b) R 8b  is iso-propyl;   c) The R 8b -bearing carbon atom is of S configuration;   d) R 9b  is hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   e) R 10b  is hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or acyl moiety;   f) R 10b  is hydrogen, methyl or acetyl;   g) R 10b  and R 11b , taken together, form a substituted or unsubstituted pyrrolidine ring; or   h) R 9b  and R 1b , taken together, form a substituted or unsubstituted thiazole ring;   
         
             xxv-c. R is —C(R 8c )C(R 9c )C(R 10c )CR 11c OCR 12c — and
           a) R 8c  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   b) R 8c  is iso-propyl;   c) The R 8c -bearing carbon atom is of S configuration;   d) R 9c  and R 10c  are each independently hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   e) CR 9c  and CR 10c  are linked via a double bond;   f) CR 9c  and CR 10c  are linked via a double bond and R 9c  is hydrogen; or   g) CR 9c  and CR 10c  are linked via a double bond and R 10c  is methyl;   
         
             xxv-c. The moiety having the structure 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
              represents the moiety having the structure: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 a) R 2  is hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl moiety; 
                 b) R 2  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , —C(CH 3 ) 2 C≡CH, cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl; 
                 l) R 2  is methyl, ethyl, propyl or i-propyl; 
                 m) R G1  is hydrogen, substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or substituted or unsubstituted phenyl; 
                 n) R G1  is hydrogen, methyl or phenyl; 
                 o) R G1  and the substituents on L, taken together, form a substituted or unsubstituted phenyl group; 
                 p) R M1  and R M2  are each independently hydrogen, hydroxyl, a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl moiety; a substituted or unsubstituted phenyl moiety, or R M2  is absent when R M1  and the substitutents on L, taken together, form a substituted or unsubstituted aryl or heteroaryl moiety; 
                 q) R M1  and R M2  are each hydrogen; 
                 r) g is 1 or 2; and/or 
                 s) L is CH 2 , S or O; 
               
             
             xxvi-c. The moiety having the structure 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
              represents the moiety having the structure: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 g) R 2  is hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl moiety; 
                 h) R 2  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , —C(CH 3 ) 2 C≡CH, cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl; 
                 i) R 2  is methyl, ethyl, propyl or i-propyl; 
                 j) R L1  and R L2  are each independently hydrogen, substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or substituted or unsubstituted phenyl; 
                 k) R L1  and R L2  are each hydrogen; 
                 l) R L1  and R L2  are each substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl; and/or 
                 m) g is 1 or 2; 
               
             
             xxvii-c. X 2  is C═O; 
             xxviii-c. X 2  is CH 2 ; 
             xxix-c. X 2  is SO 2 ; 
             xxx-c. Q is OR Q′ , SR Q′ , NR Q′ R Q″ , N 3 , ═N—OH, or a moiety selected from the group consisting of: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein each occurrence of r is 0, 1 or 2; s and t are independently an integer from 0-8; X is O, S, or NR K ; each occurrence of R Q1  and R Q2  is independently hydrogen, halogen, —CN, —S(O) h R J , —NO 2 , —COR J , —CO 2 R″, —NR J COR J , —NR J CO 2 R J , —CONR J R J , —CO(NOR J )R J , aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or -Z 1 R J ; wherein h is 1 or 2; and Z 1  is independently —O—, —S—, NR K , —C(O)—, wherein each occurrence of R J  and R K  is independently hydrogen, COR L , COOR L , CONR L R M , —NR L R M , —S(O) 2 R L , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, and wherein each occurrence of R L  and R M  is independently hydrogen, or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and R Q′  and R Q″  are independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic, aryl or heteroaryl moiety; 
               
             
             xxxi-c. Q is OR Q′ , SR Q′ , NR Q′ R Q″ , N 3 , ═N—OH, or a moiety selected from the group consisting of: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein each occurrence of r is 0, 1 or 2; s and t are independently an integer from 0-8; each occurrence of R Q1  and R Q2  is independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q1  and R Q2 , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic moiety; and R Q′  and R Q″  are independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic, aryl or heteroaryl moiety; and/or 
               
             
             xxxii-c. Q is OR Q′ , SR Q′ , NR Q′ R Q″ , N 3 , ═N—OH, or a moiety selected from the group consisting of: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein each occurrence of r is 0, 1 or 2; and R Q′  and R Q″  are independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic, aryl or heteroaryl moiety. 
               
             
           
         
       
    
     An important subclass of class (Id) includes those compounds having the structure of formula (Id) in which R is —CH(R 8a )C(R 9a )═C(R 10a )—; X 2  is C═O; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 3  and R 4  are each independently an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or, when taken together, form an alicyclic, heteroalicyclic, alicyclic(aryl), heteroalicyclic(aryl), alicyclic(heteroaryl) or heteroalicyclic(heteroaryl) moiety; R 1 , R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; and 
             R 8a , R 9a  and R 10a  are each independently hydrogen, or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and wherein any two R 7 , R 8a , R 9a  and R 10a  groups may form an alicyclic, heteroalicyclic, alicyclicc(aryl), heteroalicyclic(aryl), alicyclic(heteroaryl) or heteroalicyclic(heteroaryl) moiety, or an aryl or heteroaryl moiety. 
           
         
       
    
     Another important subclass of class (Id) includes those compounds having the structure of formula (Id) in which R is —C(R 8b )C(R 9b )N(R 10b )C(R 11b )—; X 2  is C═O; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 3  and R 4  are each independently an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or, when taken together, form an alicyclic, heteroalicyclic, alicyclic(aryl), heteroalicyclic(aryl), alicyclic(heteroaryl) or heteroalicyclic(heteroaryl) moiety; R 1 , R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; 
             R 8b , R 9b , R 10b  and R 11b  are each independently absent, hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein any two R 8b , R 9b , R 10b  and R 11b  groups, taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8b , CR 8b  and CR 9b , CR 9b  and NR 10b , NR 10b  and CR 11b  are independently linked by a single or double bond as valency permits. 
           
         
       
    
     Another important subclass of class (Id) includes those compounds having the structure of formula (Id) in which R is —C(R 8b )C(R 9b )N(R 10b )C(R 11b )—; X 2  is C═O; R 10b  and R 11b , taken together, form a cyclic heteroalkyl group; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 3  and R 4  are each independently an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or, when taken together, form an alicyclic, heteroalicyclic, alicyclic(aryl), heteroalicyclic(aryl), alicyclic(heteroaryl) or heteroalicyclic(heteroaryl) moiety; R 1 , R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; 
             p is 1, 2, 3 or 4; 
             q is 0-12; 
             each occurrence of S 1  is independently an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or any two adjacent S 1  moieties, taken together, may form an an alicyclic, heteroalicyclic, aryl or heteroaryl moiety; 
             R 8b  and R 9b  are each independently hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein R 8b  and R 9b , taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8 , and CR b  and CR 9b  are independently linked by a single or double bond as valency permits. 
           
         
       
    
     Another important subclass of class (Id) includes those compounds having the structure of formula (Id) in which X 2  is C═O; R is —C(R 8c )C(R 9c )C(R 10c )C(R 11c )OC(R 12c )—; and the compound has the following structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 3  and R 4  are each independently an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or, when taken together, form an alicyclic, heteroalicyclic, alicyclic(aryl), heteroalicyclic(aryl), alicyclic(heteroaryl) or heteroalicyclic(heteroaryl) moiety; R 1 , R 2 , R 5 -R 7  and Q are defined in classes and subclasses herein; 
             R 8c , R 9c , R 10c , R 11c  and R 12c  are each independently absent, hydrogen, —(C═O)R L  or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, wherein each occurrence of R L  is independently hydrogen, OH, OR M , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or wherein any two R 8c , R 9c , R 10c , R 11c  and R 12c  groups, taken together, form a alicyclic or heteroalicyclic moiety, or an aryl or heteroaryl moiety; wherein R M  is an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and 
             NR 7  and CR 8c , CR 8c  and CR 9c , CR 9c  and CR 10c , and CR 10c  and CR 11c  are each independently linked by a single or double bond as valency permits. 
           
         
       
    
     A number of important subclasses of each of the foregoing subclasses of class (Id) deserve separate mention; these subclasses include subclasses of the foregoing subclasses of class (Id) in which:
         i-d. R 1  and R 2  are independently hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl;   ii-d. R 1  is hydrogen and R 2  is substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl;   iii-d. R 1  is hydrogen and R 2  is substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl;   iv-d. R 1  is hydrogen and R 2  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , —C(CH 3 ) 2 C≡CH, cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl;   v-d. R 1  and R 2  are each hydrogen;   vi-d. R 1  and R 2  are independently hydrogen or methyl;   vii-d. R 1  and R 2  are each methyl;   viii-d. R 3  and R 4  are each independently substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, heteroalkyl or -alkyl(aryl) or substituted or unsubstituted aryl or heteroaryl;   ix-d. R 3  and R 4  are each independently substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl, -alkyl(aryl) or substituted or unsubstituted aryl;   x-d. R 3  and R 4  are each independently substituted or unsubstituted lower alkyl, aryl or heteroaryl;   xi-d. R 3  and R 4  are each independently methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , cyclohexyl, cyclopentyl, cyclobutyl, cyclopropyl, phenyl, —C 1-6 alkylOR a , —C 1-6 alkylSR a  or —CR a R b R c ; wherein R a  and R b  are independently hydrogen, substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl and R c  is substituted or unsubstituted aryl or heteroaryl;   xii-d. R 3  and R 4  are each independently methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , cyclohexyl, cyclopentyl, cyclobutyl, cyclopropyl, phenyl, —C 1-6 alkylOR a , —C 1-6 alkylSR a  or —CR b R c Ph; wherein R a  is hydrogen, substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl and R b  And R c  are each independently substituted or unsubstituted linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   xiii-d. R 3  and R 4  are each ethyl;   xiv-d. R 3  is phenyl and R 4  is lower alkyl;   xv-d. R 3  is phenyl and R 4  is ethyl;   xvi-d. R 3  and R 4 , taken together, form a substituted or unsubstituted cycloalkyl group;   xvii-d. R 3  and R 4 , taken together, form a cyclohexyl group;   xviv-d. R 3  and R 4 , taken together, form a substituted or unsubstituted cycloalkyl(aryl) group;   xix-d. R 5  is hydrogen;   xx-d. R 6  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   xxi-d. R 6  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl;   xxii-d. R 6  is tert-butyl;   xxiii-d. The R 6 -bearing carbon atom is of S configuration;   xxiv-d. R 7  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   xxv-d. R 7  is methyl;   xxvi-d. R is —CH(R 8a )C(R 9a )═C(R 10a )—; and
           i) R 8a  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   j) R 8a  is iso-propyl;   k) The R 8a -bearing carbon atom is of S configuration;   l) R 9a  is hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   m) R 9a  is hydrogen;   n) R 10a  is hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl; or   o) R 10a  is methyl;   
           xxvii-d. R is —C(R 8b )C(R 9b )N(R 10b )CR 11b — and
           p) R 8b  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   q) R 8b  is iso-propyl;   r) The R 8b -bearing carbon atom is of S configuration;   s) R 9b  is hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   t) R 10b  is hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl or acyl moiety;   u) R 10b  is hydrogen, methyl or acetyl;   v) R 10b  and R 11b , taken together, form a substituted or unsubstituted pyrrolidine ring; or   w) R 9b  and R 11b , taken together, form a substituted or unsubstituted thiazole ring;   
           xxviii-d. R is —C(R 8c )C(R 9c )C(R 10c )CR 11c OCR 12c — and
           h) R 8c  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   i) R 8c  is iso-propyl;   j) The R 8c -bearing carbon atom is of S configuration;   k) R 9c  and R 10c  are each independently hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl;   l) CR 9c  and CR 10c  are linked via a double bond;   m) CR 9c  and CR 10c  are linked via a double bond and R 9c  is hydrogen; or   n) CR 9c  and CR 10c  are linked via a double bond and R 10c  is methyl;   
           xxix-d. X 2  is C═O;   xxx-d. X 2  is CH 2 ;   xxxi-d. X 2  is SO 2 ;   xxxii-d. Q is OR Q′ , SR Q′ , NR Q′ R Q″ , N 3 , ═N—OH, or a moiety selected from the group consisting of:       

     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein each occurrence of r is 0, 1 or 2; s and t are independently an integer from 0-8; X is O, S, or NR K ; each occurrence of R Q1  and R Q2  is independently hydrogen, halogen, —CN, —S(O) h R J , —NO 2 , —COR J , —CO 2 R J , —NR J COR J , —NR J CO 2 R J , —CONR J R J , —CO(NOR J )R J , aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, or -Z 1 R J ; wherein h is 1 or 2; and Z 1  is independently —O—, —S—, NR K , —C(O)—, wherein each occurrence of R J  and R K  is independently hydrogen, COR L , COOR L , CONR L R M , —NR L R M , —S(O) 2 R L , or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety, and wherein each occurrence of R L  and R M  is independently hydrogen, or an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl or heteroaryl moiety; and R Q′  and R Q″  are independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic, aryl or heteroaryl moiety; 
               
             
             xxxiii-d. Q is OR Q′ , SR Q′ , NR Q′ R Q″ , N 3 , ═N—OH, or a moiety selected from the group consisting of: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein each occurrence of r is 0, 1 or 2; s and t are independently an integer from 0-8; each occurrence of R Q1  and R Q2  is independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q1  and R Q2 , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic moiety; and R Q′  and R Q″  are independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic, aryl or heteroaryl moiety; and/or 
               
             
             xxxiv-d. Q is OR Q′ , SR Q′ , NR Q′ R Q″ , N 3 , ═N—OH, ═N—OH, or a moiety selected from the group consisting of: 
           
         
       
    
     
       
         
         
             
             
         
       
         
         
           
             
               
                 wherein each occurrence of r is 0, 1 or 2; and R Q′  and R Q″  are independently hydrogen, or a substituted or unsubstituted, linear or branched, cyclic or acyclic alkyl or heteroalkyl moiety, or a substituted or unsubstituted aryl or heteroaryl moiety; or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic, aryl or heteroaryl moiety. 
               
             
           
         
       
    
     As the reader will appreciate, compounds of particular interest include, among others, those which share the attributes of one or more of the foregoing subclasses. Some of those subclasses are illustrated by the following sorts of compounds: 
     I) Compounds of the Formula (and Pharmaceutically Acceptable Derivatives thereof): 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 -R 2 , R 4a , R 4b , R 9a -R 10a  and Q are as defined above and in subclasses herein; and Ar is a substituted or unsubstitued aryl or heteroaryl moiety. 
           
         
       
    
     II) Compounds of the Formula (and Pharmaceutically Acceptable Derivatives thereof): 
     
       
         
         
             
             
         
       
         
         
           
             wherein A, B, D, E, a, b, d, e, R 1 -R 2 , R 4a , R 4b , and R 9a -R 10a  are as defined above and in subclasses herein; and Ar is a substituted or unsubstitued aryl or heteroaryl moiety. 
           
         
       
    
     It will also be appreciated that for each of the subgroups I-II described above, a variety of other subclasses are of special interest, including, but not limited to those classes i-a. through xliv-a. described above and classes, subclasses and species of compounds described above and in the examples herein. 
     III) Compounds of the Formula (and Pharmaceutically Acceptable Derivatives thereof): 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 -R 2 , R 4a , R 4b , R 9b -R 11b  and R G  are as defined above and in subclasses herein; and Ar is a substituted or unsubstitued aryl or heteroaryl moiety. 
           
         
       
    
     IV) Compounds of the Formula (and Pharmaceutically Acceptable Derivatives thereof): 
     
       
         
         
             
             
         
       
         
         
           
             wherein A, B, D, E, a, b, d, e, R 1 -R 2 , R 4a , R 4b , and R 9b -R 11b  are as defined above and in subclasses herein; and Ar is a substituted or unsubstitued aryl or heteroaryl moiety. 
           
         
       
    
     V) Compounds of the Formula (and Pharmaceutically Acceptable Derivatives thereof): 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 -R 2 , R 4a , R 4b , R 9c -R 12c  and R G  are as defined above and in subclasses herein; and Ar is a substituted or unsubstitued aryl or heteroaryl moiety. 
           
         
       
    
     It will also be appreciated that for each of the subgroups III-V described above, a variety of other subclasses are of special interest, including, but not limited to those classes i-b. through xlv-b. described above and classes, subclasses and species of compounds described above and in the examples herein. 
     VI) Compounds of the Formula (and Pharmaceutically Acceptable Derivatives thereof): 
     
       
         
         
             
             
         
       
         
         
           
             wherein L, R 9a -R 10a , R G1 , R M1  and R M2  are as defined above and in subclasses herein; g is 1 or 2; Q is OR Q′ , wherein R Q′  is hydrogen or lower alkyl; and R 2  and R 6  are independently substituted or unsubstituted linear or branched lower alkyl. 
           
         
       
    
     VII) Compounds of the Formula (and Pharmaceutically Acceptable Derivatives thereof): 
     
       
         
         
             
             
         
       
         
         
           
             wherein g, R 9a -R 10a , R L1  and R L2  are as defined above and in subclasses herein; X 1  is CH 2  or C═O; R 2  and R 6  are independently substituted or unsubstituted linear or branched lower alkyl; and Q is OR Q′  or NR Q′ R Q″  wherein R Q′  is hydrogen or lower alkyl, or R Q′  and R Q″ , taken together with the nitrogen atom to which they are attached, form a substituted or unsubstituted heterocyclic moiety, whereby each of the foregoing alkyl moieties may be substituted or unsubstituted, linear or branched, cyclic or acyclic. 
           
         
       
    
     VIII) Compounds of the Formula (and Pharmaceutically Acceptable Derivatives thereof): 
     
       
         
         
             
             
         
       
         
         
           
             wherein A, B, D, E, L, a, b, d, e, p, R 9b , R G1 , R M1  and R M2  are as defined above and in subclasses herein; g is 1 or 2; and R 2  and R 6  are independently substituted or unsubstituted linear or branched lower alkyl. 
           
         
       
    
     IX) Compounds of the Formula (and Pharmaceutically Acceptable Derivatives thereof): 
     
       
         
         
             
             
         
       
         
         
           
             wherein p, R 9b , R L1 , R L2 , R Q′  and R Q″  are as defined above and in subclasses herein; and R 2  and R 6  are independently substituted or unsubstituted linear or branched lower alkyl. 
           
         
       
    
     It will also be appreciated that for each of the subgroups VI-IX described above, a variety of other subclasses are of special interest, including, but not limited to those classes i-c. through xxxii-c. described above and classes, subclasses and species of compounds described above and in the examples herein. In certain embodiments, for compounds of subgroups VI-IX above, R 2  is methyl, iso-propyl, sec-butyl or —CH(CH 3 )CH(CH 3 ) 2 . In certain embodiments, for compounds of subgroups VI-IX above, R 6  is tert-butyl or iso-propyl. In certain embodiments, for compounds of subgroups VI-IX above, R 2  is methyl, iso-propyl, sec-butyl or —CH(CH 3 )CH(CH 3 ) 2 , and R 6  is tert-butyl or iso-propyl. In certain exemplary embodiments, for compounds of subgroups VI-IX above, R 2  is methyl and R 6  is tert-butyl. In certain exemplary embodiments, for compounds of subgroups VI-IX above, R 2  is iso-propyl and R 6  is tert-butyl. In certain exemplary embodiments, for compounds of subgroups VI-IX above, R 2  is sec-butyl and R 6  is tert-butyl or iso-propyl. In certain exemplary embodiments, for compounds of subgroups VI-IX above, R 2  is —CH(CH 3 )CH(CH 3 ) 2 , and R 6  is tert-butyl. 
     X) Compounds of the Formula (and Pharmaceutically Acceptable Derivatives thereof): 
     
       
         
         
             
             
         
       
         
         
           
             wherein R 1 , R 9a , R 10a  and R G  are as defined above and in subclasses herein; and R 3  and R 4  are each independently an alkyl, heteroalkyl, heteroalkyl(aryl) or alkyl(aryl) moiety, or R 3  and R 4 , taken together, form a cyclic alkyl or heteroalkyl moiety. 
           
         
       
    
     It will also be appreciated that for subgroup X described above, a variety of other subclasses are of special interest, including, but not limited to those classes i-d. through xxxiv-d. described above and classes, subclasses and species of compounds described above and in the examples herein. 
     Some of the foregoing compounds can comprise one or more asymmetric centers, and thus can exist in various isomeric forms, e.g., stereoisomers and/or diastereomers. It is to be understood that the invention encompasses every possible isomer such as geometric isomer, optical isomer, stereoisomer and tautomer based on asymmetric carbon, which can occur in the structures of the inventive compounds, and mixtures of such isomers, and is not limited to the specific stereochemistry shown for the compounds disclosed in the present specification. It will be further appreciated that the absolute stereochemistry of some of the compounds recited in the Exemplification herein has not been determined, and that when a stereochemistry was assigned for those compounds it is meant to be tentative and to indicate that a set of diastereomers exists for those compounds and/ot that a diastereomer was isolated in pure form. Thus, inventive compounds and pharmaceutical compositions thereof may be in the form of an individual enantiomer, diastereomer or geometric isomer, or may be in the form of a mixture of stereoisomers. In certain embodiments, the compounds of the invention are enantiopure compounds. In certain other embodiments, mixtures of stereoisomers or diastereomers are provided. 
     Furthermore, certain compounds, as described herein may have one or more double bonds that can exist as either the Z or E isomer, unless otherwise indicated. The invention additionally encompasses the compounds as individual isomers substantially free of other isomers and alternatively, as mixtures of various isomers, e.g., racemic mixtures of stereoisomers. The invention also encompasses tautomers of specific compounds as described above. In addition to the above-mentioned compounds per se, this invention also encompasses pharmaceutically acceptable derivatives of these compounds and compositions comprising one or more compounds of the invention and one or more pharmaceutically acceptable excipients or additives. 
     Compounds of the invention may be prepared by crystallization of compound of formula (I) under different conditions and may exist as one or a combination of polymorphs of compound of general formula (I) forming part of this invention. For example, different polymorphs may be identified and/or prepared using different solvents, or different mixtures of solvents for recrystallization; by performing crystallizations at different temperatures; or by using various modes of cooling, ranging from very fast to very slow cooling during crystallizations. Polymorphs may also be obtained by heating or melting the compound followed by gradual or fast cooling. The presence of polymorphs may be determined by solid probe NMR spectroscopy, IR spectroscopy, differential scanning calorimetry, powder X-ray diffractogram and/or other techniques. Thus, the present invention encompasses inventive compounds, their derivatives, their tautomeric forms, their stereoisomers, their polymorphs, their pharmaceutically acceptable salts their pharmaceutically acceptable solvates and pharmaceutically acceptable compositions containing them. 
     2) Compounds and Definitions 
     As discussed above, this invention provides novel compounds with a range of biological properties. Compounds of this invention have biological activities relevant for the treatment of diseases or other disorders such as proliferative diseases, including, but not limited to cancer. In certain other embodiments, the inventive compounds also find use in the prevention of restenosis of blood vessels subject to traumas such as angioplasty and stenting. 
     Compounds of this invention include those specifically set forth above and described herein, and are illustrated in part by the various classes, subgenera and species disclosed elsewhere herein. 
     Additionally, the present invention provides pharmaceutically acceptable derivatives of the inventive compounds, and methods of treating a subject using these compounds, pharmaceutical compositions thereof, or either of these in combination with one or more additional therapeutic agents. The phrase, “pharmaceutically acceptable derivative”, as used herein, denotes any pharmaceutically acceptable salt, ester, or salt of such ester, of such compound, or any other adduct or derivative which, upon administration to a patient, is capable of providing (directly or indirectly) a compound as otherwise described herein, or a metabolite or residue thereof. Pharmaceutically acceptable derivatives thus include among others pro-drugs. A pro-drug is a derivative of a compound, usually with significantly reduced pharmacological activity, which contains an additional moiety which is susceptible to removal in vivo yielding the parent molecule as the pharmacologically active species. An example of a pro-drug is an ester which is cleaved in vivo to yield a compound of interest. Pro-drugs of a variety of compounds, and materials and methods for derivatizing the parent compounds to create the pro-drugs, are known and may be adapted to the present invention. Certain exemplary pharmaceutical compositions and pharmaceutically acceptable derivatives will be discussed in more detail herein below. 
     Numerous suitable prodrug moieties, and information concerning their selection, synthesis and use are well known in the art. Examples of prodrug moieties of interest include, among others, prodrug moieties that can be attached to primary or secondary amine-containing functionalities. Examples of such prodrug moieties include the following: 
                         
For the synthesis of the prodrug groups, see Borchardt, R. T. et al.,  J. Org. Chem.  1997, 43, 3641-3652.
         R 1 =all natural,   unnatural amino acids       
                         
For the synthesis of the prodrug groups, see Zhou, X-X. et. al., PCT WO 99/51613.
         R 1 =C1-C4 alkyl, cycloalkyl, oxyalkyl, aminoalkyl, etc.   R 2 =all natural, unnatural amino acids       
                         
For the synthesis of the prodrug groups, see Ezra, A et. al.,  J. Med. Chem.  2000, 43, 3641-3652.
         R 1 , R 2 =all natural, unnatural amino acids
 
Other examples of prodrug moieties of interest include prodrug moieties that can be attached to hydroxyl-containing functionalities. Such prodrug moieties a well-known in the art, and will be readily identified by a person skilled in the relevant art. The present invention encompasses any prodrug form of the compounds described herein.
       
     Certain compounds of the present invention, and definitions of specific functional groups are also described in more detail below. For purposes of this invention, the chemical elements are identified in accordance with the Periodic Table of the Elements, CAS version, Handbook of Chemistry and Physics, 75 th  Ed., inside cover, and specific functional groups are generally defined as described therein. Additionally, general principles of organic chemistry, as well as specific functional moieties and reactivity, are described in “Organic Chemistry”, Thomas Sorrell, University Science Books, Sausalito: 1999, the entire contents of which are incorporated herein by reference. Furthermore, it will be appreciated by one of ordinary skill in the art that the synthetic methods, as described herein, utilize a variety of protecting groups. By the term “protecting group”, as used herein, it is meant that a particular functional moiety, e.g., O, S, or N, is temporarily blocked so that a reaction can be carried out selectively at another reactive site in a multifunctional compound. In preferred embodiments, a protecting group reacts selectively in good yield to give a protected substrate that is stable to the projected reactions; the protecting group must be selectively removed in good yield by readily available, preferably nontoxic reagents that do not attack the other functional groups; the protecting group forms an easily separable derivative (more preferably without the generation of new stereogenic centers); and the protecting group has a minimum of additional functionality to avoid further sites of reaction. As detailed herein, oxygen, sulfur, nitrogen and carbon protecting groups may be utilized. For example, in certain embodiments, as detailed herein, certain exemplary oxygen protecting groups are utilized. These oxygen protecting groups include, but are not limited to methyl ethers, substituted methyl ethers (e.g., MOM (methoxymethyl ether), MTM (methylthiomethyl ether), BOM (benzyloxymethyl ether), PMBM (p-methoxybenzyloxymethyl ether), to name a few), substituted ethyl ethers, substituted benzyl ethers, silyl ethers (e.g., TMS (trimethylsilyl ether), TES (triethylsilylether), TIPS (triisopropylsilyl ether), TBDMS (t-butyldimethylsilyl ether), tribenzyl silyl ether, TBDPS (t-butyldiphenyl silyl ether), to name a few), esters (e.g., formate, acetate, benzoate (Bz), trifluoroacetate, dichloroacetate, to name a few), carbonates, cyclic acetals and ketals. In certain other exemplary embodiments, nitrogen protecting groups are utilized. These nitrogen protecting groups include, but are not limited to, carbamates (including methyl, ethyl and substituted ethyl carbamates (e.g., Troc), to name a few) amides, cyclic imide derivatives, N-Alkyl and N-Aryl amines, imine derivatives, and enamine derivatives, to name a few. Certain other exemplary protecting groups are detailed herein, however, it will be appreciated that the present invention is not intended to be limited to these protecting groups; rather, a variety of additional equivalent protecting groups can be readily identified using the above criteria and utilized in the present invention. Additionally, a variety of protecting groups are described in “Protective Groups in Organic Synthesis” Third Ed. Greene, T. W. and Wuts, P. G., Eds., John Wiley &amp; Sons, New York: 1999, the entire contents of which are hereby incorporated by reference. 
     It will be appreciated that the compounds, as described herein, may be substituted with any number of substituents or functional moieties. In general, the term “substituted” whether preceded by the term “optionally” or not, and substituents contained in formulas of this invention, refer to the replacement of hydrogen radicals in a given structure with the radical of a specified substituent. When more than one position in any given structure may be substituted with more than one substituent selected from a specified group, the substituent may be either the same or different at every position. As used herein, the term “substituted” is contemplated to include all permissible substituents of organic compounds. In a broad aspect, the permissible substituents include acyclic and cyclic, branched and unbranched, carbocyclic and heterocyclic, aromatic and nonaromatic substituents of organic compounds. For purposes of this invention, heteroatoms such as nitrogen may have hydrogen substituents and/or any permissible substituents of organic compounds described herein which satisfy the valencies of the heteroatoms. Furthermore, this invention is not intended to be limited in any manner by the permissible substituents of organic compounds. Combinations of substituents and variables envisioned by this invention are preferably those that result in the formation of stable compounds useful in the treatment, for example of cancer. The term “stable”, as used herein, preferably refers to compounds which possess stability sufficient to allow manufacture and which maintain the integrity of the compound for a sufficient period of time to be detected and preferably for a sufficient period of time to be useful for the purposes detailed herein. 
     The term “aliphatic”, as used herein, includes both saturated and unsaturated, straight chain (i.e., unbranched) or branched aliphatic hydrocarbons, which are optionally substituted with one or more functional groups. As will be appreciated by one of ordinary skill in the art, “aliphatic” is intended herein to include, but is not limited to, alkyl, alkenyl, alkynyl moieties. Thus, as used herein, the term “alkyl” includes straight and branched alkyl groups. An analogous convention applies to other generic terms such as “alkenyl”, “alkynyl” and the like. Furthermore, as used herein, the terms “alkyl”, “alkenyl”, “alkynyl” and the like encompass both substituted and unsubstituted groups. In certain embodiments, as used herein, “lower alkyl” is used to indicate those alkyl groups (cyclic, acyclic, substituted, unsubstituted, branched or unbranched) having 1-6 carbon atoms. 
     In certain embodiments, the alkyl, alkenyl and alkynyl groups employed in the invention contain 1-20 aliphatic carbon atoms. In certain other embodiments, the alkyl, alkenyl, and alkynyl groups employed in the invention contain 1-10 aliphatic carbon atoms. In yet other embodiments, the alkyl, alkenyl, and alkynyl groups employed in the invention contain 1-8 aliphatic carbon atoms. In still other embodiments, the alkyl, alkenyl, and alkynyl groups employed in the invention contain 1-6 aliphatic carbon atoms. In yet other embodiments, the alkyl, alkenyl, and alkynyl groups employed in the invention contain 1-4 carbon atoms. Illustrative aliphatic groups thus include, but are not limited to, for example, methyl, ethyl, n-propyl, isopropyl, allyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, sec-pentyl, isopentyl, tert-pentyl, n-hexyl, sec-hexyl, moieties and the like, which again, may bear one or more substituents. Alkenyl groups include, but are not limited to, for example, ethenyl, propenyl, butenyl, 1-methyl-2-buten-1-yl, and the like. Representative alkynyl groups include, but are not limited to, ethynyl, 2-propynyl (propargyl), 1-propynyl and the like. 
     The term “alicyclic”, as used herein, refers to compounds which combine the properties of aliphatic and cyclic compounds and include but are not limited to cyclic, or polycyclic aliphatic hydrocarbons and bridged cycloalkyl compounds, which are optionally substituted with one or more functional groups. As will be appreciated by one of ordinary skill in the art, “alicyclic” is intended herein to include, but is not limited to, cycloalkyl, cycloalkenyl, and cycloalkynyl moieties, which are optionally substituted with one or more functional groups. Illustrative alicyclic groups thus include, but are not limited to, for example, cyclopropyl, —CH 2 -cyclopropyl, cyclobutyl, —CH 2 -cyclobutyl, cyclopentyl, —CH 2 -cyclopentyl-n, cyclohexyl, —CH 2 -cyclohexyl, cyclohexenylethyl, cyclohexanylethyl, norborbyl moieties and the like, which again, may bear one or more substituents. 
     The term “alkoxy” (or “alkyloxy”), or “thioalkyl” as used herein refers to an alkyl group, as previously defined, attached to the parent molecular moiety through an oxygen atom or through a sulfur atom. In certain embodiments, the alkyl group contains 1-20 aliphatic carbon atoms. In certain other embodiments, the alkyl group contains 1-10 aliphatic carbon atoms. In yet other embodiments, the alkyl, alkenyl, and alkynyl groups employed in the invention contain 1-8 aliphatic carbon atoms. In still other embodiments, the alkyl group contains 1-6 aliphatic carbon atoms. In yet other embodiments, the alkyl group contains 1-4 aliphatic carbon atoms. Examples of alkoxy, include but are not limited to, methoxy, ethoxy, propoxy, isopropoxy, n-butoxy, tert-butoxy, neopentoxy and n-hexoxy. Examples of thioalkyl include, but are not limited to, methylthio, ethylthio, propylthio, isopropylthio, n-butylthio, and the like. 
     The term “alkylamino” refers to a group having the structure —NHR′ wherein R′ is alkyl, as defined herein. The term “aminoalkyl” refers to a group having the structure NH 2 R′—, wherein R′ is alkyl, as defined herein. In certain embodiments, the alkyl group contains 1-20 aliphatic carbon atoms. In certain other embodiments, the alkyl group contains 1-10 aliphatic carbon atoms. In yet other embodiments, the alkyl, alkenyl, and alkynyl groups employed in the invention contain 1-8 aliphatic carbon atoms. In still other embodiments, the alkyl group contains 1-6 aliphatic carbon atoms. In yet other embodiments, the alkyl group contains 1-4 aliphatic carbon atoms. Examples of alkylamino include, but are not limited to, methylamino, ethylamino, iso-propylamino and the like. 
     Some examples of sutstituents of the above-described aliphatic (and other) moieties of compounds of the invention include, but are not limited to aliphatic; alicyclic; heteroaliphatic; heteroalicyclic; aryl; heteroaryl; alkylaryl; alkylheteroaryl; alkoxy; aryloxy; heteroalkoxy; heteroaryloxy; alkylthio; arylthio; heteroalkylthio; heteroarylthio; F; Cl; Br; I; —OH; —NO 2 ; —CN; —CF 3 ; —CH 2 CF 3 ; —CH1 2 ; —CH 2 OH; —CH 2 CH 2 OH; —CH 2 NH 2 ; —CH 2 SO 2 CH 3 ; —C(O)R x ; —CO 2 (R x ); —CON(R x ) 2 ; —OC(O)R x ; —OCO 2 R x ; —OCON(R x ) 2 ; —N(R x ) 2 ; —S(O) 2 R x ; —NR x (CO)R x  wherein each occurrence of R x  independently includes, but is not limited to, aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl, heteroaryl, alkylaryl, or alkylheteroaryl, wherein any of the aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl, heteroaryl, alkylaryl, or alkylheteroaryl, substituents described above and herein may be substituted or unsubstituted, branched or unbranched, cyclic or acyclic, and wherein any of the aryl or heteroaryl substituents described above and herein may be substituted or unsubstituted. Additional examples of generally applicable substituents are illustrated by the specific embodiments shown in the Examples that are described herein. 
     In general, the terms “aryl” and “heteroaryl”, as used herein, refer to stable mono- or polycyclic, heterocyclic, polycyclic, and polyheterocyclic unsaturated moieties having preferably 3-14 carbon atoms, each of which may be substituted or unsubstituted. It will also be appreciated that aryl and heteroaryl moieties, as defined herein may be attached via an aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, alkyl or heteroalkyl moiety and thus also include -(aliphatic)aryl, -(heteroaliphatic)aryl, -(aliphatic)heteroaryl, -(heteroaliphatic)heteroaryl, -(alkyl)aryl, -(heteroalkyl)aryl, -(heteroalkyl)aryl, and -(heteroalkyl)heteroaryl moieties. Thus, as used herein, the phrases “aryl or heteroaryl” and “aryl, heteroaryl, -(aliphatic)aryl, -(heteroaliphatic)aryl, -(aliphatic)heteroaryl, -(heteroaliphatic)heteroaryl, -(alkyl)aryl, -(heteroalkyl)aryl, -(heteroalkyl)aryl, and -(heteroalkyl)heteroaryl” are interchangeable. Substituents include, but are not limited to, any of the previously mentioned substitutents, i.e., the substituents recited for aliphatic moieties, or for other moieties as disclosed herein, resulting in the formation of a stable compound. In certain embodiments of the present invention, “aryl” refers to a mono- or bicyclic carbocyclic ring system having one or two aromatic rings including, but not limited to, phenyl, naphthyl, tetrahydronaphthyl, indanyl, indenyl and the like. In certain embodiements of the present invention, the term “heteroaryl”, as used herein, refers to a cyclic aromatic radical having from five to ten ring atoms of which one ring atom is selected from S, O and N; zero, one or two ring atoms are additional heteroatoms independently selected from S, O and N; and the remaining ring atoms are carbon, the radical being joined to the rest of the molecule via any of the ring atoms, such as, for example, pyridyl, pyrazinyl, pyrimidinyl, pyrrolyl, pyrazolyl, imidazolyl, thiazolyl, oxazolyl, isooxazolyl, thiadiazolyl, oxadiazolyl, thiophenyl, furanyl, quinolinyl, isoquinolinyl, and the like. 
     It will be appreciated that aryl and heteroaryl groups (including bycyclic aryl groups) can be unsubstituted or substituted, wherein substitution includes replacement of one, two or three of the hydrogen atoms thereon independently with any one or more of the following moieties including, but not limited to: aliphatic; alicyclic; heteroaliphatic; heteroalicyclic; aryl; heteroaryl; alkylaryl; alkylheteroaryl; alkoxy; aryloxy; heteroalkoxy; heteroaryloxy; alkylthio; arylthio; heteroalkylthio; heteroarylthio; F; Cl; Br; I; —OH; —NO 2 ; —CN; —CF 3 ; —CH 2 CF 3 ; —CHCl 2 ; —CH 2 OH; —CH 2 CH 2 OH; —CH 2 NH 2 ; —CH 2 SO 2 CH 3 ; —C(O)R x ; —CO 2 (R x ); —CON(R x ) 2 ; —OC(O)R x ; —OCO 2 R x ; —OCON(R x ) 2 ; —N(R x ) 2 ; —S(O) 2 R x ; —NR x (CO)R x  wherein each occurrence of R x  independently includes, but is not limited to, aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl, heteroaryl, alkylaryl, or alkylheteroaryl, wherein any of the aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl, heteroaryl, alkylaryl, or alkylheteroaryl, substituents described above and herein may be substituted or unsubstituted, branched or unbranched, cyclic or acyclic, and wherein any of the aryl or heteroaryl substituents described above and herein may be substituted or unsubstituted. Additional examples of generally applicable substituents are illustrated by the specific embodiments shown in the Examples that are described herein. 
     The term “cycloalkyl”, as used herein, refers specifically to groups having three to seven, preferably three to ten carbon atoms. Suitable cycloalkyls include, but are not limited to cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl and the like, which, as in the case of other aliphatic, heteroaliphatic or hetercyclic moieties, may optionally be substituted with substituents including, but not limited to aliphatic; alicyclic; heteroaliphatic; heteroalicyclic; aryl; heteroaryl; alkylaryl; alkylheteroaryl; alkoxy; aryloxy; heteroalkoxy; heteroaryloxy; alkylthio; arylthio; heteroalkylthio; heteroarylthio; F; Cl; Br; I; —OH; —NO 2 ; —CN; —CF 3 ; —CH 2 CF 3 ; —CHCl 2 ; —CH 2 OH; —CH 2 CH 2 OH; —CH 2 NH 2 ; —CH 2 SO 2 CH 3 ; —C(O)R x ; —CO 2 (R x ); —CON(R x ) 2 ; —OC(O)R x ; —OCO 2 R x ; —OCON(R x ) 2 ; —N(R x ) 2 ; —S(O) 2 R x ; —NR x (CO)R x  wherein each occurrence of R x  independently includes, but is not limited to, aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl, heteroaryl, alkylaryl, or alkylheteroaryl, wherein any of the aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl, heteroaryl, alkylaryl, or alkylheteroaryl, substituents described above and herein may be substituted or unsubstituted, branched or unbranched, cyclic or acyclic, and wherein any of the aryl or heteroaryl substituents described above and herein may be substituted or unsubstituted. Additional examples of generally applicable substituents are illustrated by the specific embodiments shown in the Examples that are described herein. 
     The term “heteroaliphatic”, as used herein, refers to aliphatic moieties in which one or more carbon atoms in the main chain have have substituted with an heteroatom. Thus, a heteroaliphatic group refers to an aliphatic chain which contains one or more oxygen sulfur, nitrogen, phosphorus or silicon atoms, e.g., in place of carbon atoms. Heteroaliphatic moieties may be branched or linear unbranched. In certain embodiments, heteroaliphatic moieties are substituted by independent replacement of one or more of the hydrogen atoms thereon with one or more moieties including, but not limited to aliphatic; alicyclic; heteroaliphatic; heteroalicyclic; aryl; heteroaryl; alkylaryl; alkylheteroaryl; alkoxy; aryloxy; heteroalkoxy; heteroaryloxy; alkylthio; arylthio; heteroalkylthio; heteroarylthio; F; Cl; Br; I; —OH; —NO 2 ; —CN; —CF 3 ; —CH 2 CF 3 ; —CHCl 2 ; —CH 2 OH; —CH 2 CH 2 OH; —CH 2 NH 2 ; —CH 2 SO 2 CH 3 ; —C(O)R x ; —CO 2 (R x ); —CON(R x ) 2 ; —OC(O)R x ; —OCO 2 R x ; —OCON(R x ) 2 ; —N(R x ) 2 ; —S(O) 2 R x ; —NR x (CO)R x  wherein each occurrence of R x  independently includes, but is not limited to, aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl, heteroaryl, alkylaryl, or alkylheteroaryl, wherein any of the aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, alkylaryl, or alkylheteroaryl substituents described above and herein may be substituted or unsubstituted, branched or unbranched, cyclic or acyclic, and wherein any of the aryl or heteroaryl substituents described above and herein may be substituted or unsubstituted. Additional examples of generally applicable substituents are illustrated by the specific embodiments shown in the Examples that are described herein. 
     The term “heteroalicyclic”, as used herein, refers to compounds which combine the properties of heteroaliphatic and cyclic compounds and include but are not limited to saturated and unsaturated mono- or polycyclic heterocycles such as morpholino, pyrrolidinyl, furanyl, thiofuranyl, pyrrolyl etc., which are optionally substituted with one or more functional groups. 
     The terms “halo” and “halogen” as used herein refer to an atom selected from fluorine, chlorine, bromine and iodine. 
     The term “haloalkyl” denotes an alkyl group, as defined above, having one, two, or three halogen atoms attached thereto and is exemplified by such groups as chloromethyl, bromoethyl, trifluoromethyl, and the like. 
     The term “heterocycloalkyl” or “heterocycle”, as used herein, refers to a non-aromatic 5-, 6- or 7-membered ring or a polycyclic group, including, but not limited to a bi- or tri-cyclic group comprising fused six-membered rings having between one and three heteroatoms independently selected from oxygen, sulfur and nitrogen, wherein (i) each 5-membered ring has 0 to 1 double bonds and each 6-membered ring has 0 to 2 double bonds, (ii) the nitrogen and sulfur heteroatoms may be optionally be oxidized, (iii) the nitrogen heteroatom may optionally be quaternized, and (iv) any of the above heterocyclic rings may be fused to an aryl or heteroaryl ring. Representative heterocycles include, but are not limited to, pyrrolidinyl, pyrazolinyl, pyrazolidinyl, imidazolinyl, imidazolidinyl, piperidinyl, piperazinyl, oxazolidinyl, isoxazolidinyl, morpholinyl, thiazolidinyl, isothiazolidinyl, and tetrahydrofuryl. In certain embodiments, a “substituted heterocycloalkyl or heterocycle” group is utilized and as used herein, refers to a heterocycloalkyl or heterocycle group, as defined above, substituted by the independent replacement of one, two or three of the hydrogen atoms thereon with but are not limited to aliphatic; alicyclic; heteroaliphatic; heteroalicyclic; aryl; heteroaryl; alkylaryl; alkylheteroaryl; alkoxy; aryloxy; heteroalkoxy; heteroaryloxy; alkylthio; arylthio; heteroalkylthio; heteroarylthio; F; Cl; Br; I; —OH; —NO 2 ; —CN; —CF 3 ; —CH 2 CF 3 ; —CHCl 2 ; —CH 2 OH; —CH 2 CH 2 OH, —CH 2 NH 2 ; —CH 2 SO 2 CH 3 ; —C(O)R x ; —CO 2 (R x ); —CON(R x ) 2 ; —OC(O)R x ; —OCO 2 R x ; —OCON(R x ) 2 ; —N(R x ) 2 ; —S(O) 2 R x ; —NR x (CO)R x  wherein each occurrence of R x  independently includes, but is not limited to, aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl, heteroaryl, alkylaryl, or alkylheteroaryl, wherein any of the aliphatic, alicyclic, heteroaliphatic, heteroalicyclic, aryl, heteroaryl, alkylaryl, or alkylheteroaryl, substituents described above and herein may be substituted or unsubstituted, branched or unbranched, cyclic or acyclic, and wherein any of the aryl or heteroaryl substitutents described above and herein may be substituted or unsubstituted. Additional examples or generally applicable substituents are illustrated by the specific embodiments shown in the Examples, which are described herein. 
     As used herein, the terms “aliphatic”, “heteroaliphatic”, “alkyl”, “alkenyl”, “alkynyl”, “heteroalkyl”, “heteroalkenyl”, “heteroalkynyl”, and the like encompass substituted and unsubstituted, saturated and unsaturated, and linear and branched groups. Similarly, the terms “alicyclic”, “heteroalicyclic”, “heterocycloalkyl”, “heterocycle”, and the like encompass substituted and unsubstituted, and saturated and unsaturated groups. In addition, the terms “aliphatic(aryl)”, “heteroaliphatic(aryl)”, “aliphatic(heteroaryl)”, “heteroaliphatic(heteroaryl)”, “alicyclic(aryl)”, “heteroalicyclic(aryl)”, “alicyclic(heteroaryl)”, “heteroalicyclic(heteroaryl)”, “-alkyl(aryl)”, “heteroalkyl(aryl)”, “-alkyl(heteroaryl)”, “heteroalkyl(heteroaryl)”, and the like encompass substituted and unsubstituted, and saturated and unsaturated (i.e., non-aromatic portion of the moiety) groups. Additionally, the terms “cycloalkyl”, “cycloalkenyl”, “cycloalkynyl”, “heterocycloalkyl”, “heterocycloalkenyl”, “heterocycloalkynyl”, “aryl”, “heteroaryl” and the like encompass both substituted and unsubstituted groups, unless otherwise indicated. 
     3) Synthetic Methodology 
     According to the present invention, any available techniques can be used to make or prepare the inventive compounds or compositions including them. For example, a variety of solution phase synthetic methods such as those discussed in detail below may be used. Alternatively or additionally, the inventive compounds may be prepared using any of a variety combinatorial techniques, parallel synthesis and/or solid phase synthetic methods known in the art. 
     In one aspect, the present invention provides novel peptides having formula (I) as described above and in certain classes and subclasses herein. Examples of synthetic methods for preparing exemplary types of compounds of the invention are provided below, as detailed in Schemes 1-20, and in the Exemplification herein. It will be appreciated that the methods as described herein can be applied to each of the compounds as disclosed herein and equivalents thereof. Additionally, the reagents and starting materials are well known to those skilled in the art. Although the following schemes describe certain exemplary compounds, it will be appreciated that the use of alternate starting materials will yield other analogs of the invention. For example, compounds are described below where X 1  and X 2  are each C═O, R 5  is hydrogen, R 6  is tert-butyl and R 7  is methyl; however, it will be appreciated that alternate starting materials and/or intermediates can be utilized to generate compounds where, for example, X 1  and X 2  may be independently C═O, CH 2 , SO 2 , and R 5 -R 7  may represent moieties other than those depicted herein, such as alkyl, heteroalkyl, aryl, heteroaryl, etc. It will also be appreciated that any available techniques known in the art can be used to make the inventive compounds or compositions including them. A person of ordinary skill in the art will recognize that suitable synthetic methods are not limited to those depicted in Schemes 1-20 below, and that any suitable synthetic methods known in the art can be used to prepare the inventive compounds. 
     In certain embodiments, the inventive compounds, have the general structure (I′) as shown in Scheme 1, where R, R′ and Q are aliphatic, heteroaliphatic, aryl or heteroaryl moieties. In preferred embodiments, R, R′ and Q are moieties such as those described in classes and subclasses herein. Examples of preferred structures for R, R′ and Q are depicted in Scheme 1. 
     
       
         
         
             
             
         
       
     
     In certain embodiments, the inventive compounds belong to class (Ia) and subclasses thereof, as described herein. Scheme 2 depicts the synthesis of exemplary compounds of this class (compounds of general structure 11). As shown in Scheme 2, the dipeptide core can be constructed, for example, from N-Boc-N-methyl-valinal (2) and N-Boc-tert-leucine (4). The N-terminal moiety of the compounds of the invention (R′ in Scheme 1) may be provided by (S)-N-Boc-neo-phenylalanine (6). As depicted in Scheme 2, a variety of synthetic methods allow access to a variety of analogs, for example, carboxylic esters of general structure 7, carboxylic acid 8 or amides of general structure 11. The reader will appreciate that other synthetic methods known in the art can be used to prepare other derivatives. 
     
       
         
         
             
             
         
       
     
     An exemplary synthetic approach for the preparation of intermediate 6 is depicted in Scheme 3. The method afforded (S)-N-Boc-neo-phenylalanine (6) in 20% overall yield. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     In certain other embodiments, the inventive compounds belong to class (Ib) and subclasses thereof, as described herein. Schemes 4-6 depict the synthesis of exemplary types of compounds of this class (for example, Amine Esters, Amine Acids, Amine Amides and N-Acetyl Amine Amides of general structure 18, 20, 23, respectively as seen in Schemes 4; See also Amine Esters, Amine Acids, Amine Amides and N-Acetyl Amine Amides of general structure 25, 26 and 27, respectively in Scheme 5). In certain embodiments, R may be a nitrogen-containing heteroalkyl moiety (see Schemes 4 and 5) or an unsaturated oxygen-containing heteroalkyl moiety (see Scheme 6). Although Schemes 4-6 depict compounds comprising an N-terminal moiety derived from (S)-N-Boc-neo-phenylalanine (6), a person of ordinary skill in the art would appreciate that a wide variety of organic moieties other than those described in Schemes 4-6 may be used to construct the compounds of the invention. Similarly, Schemes 4-6 recite compounds where the C-terminal moiety may be carboxylic esters, carboxylic acids or amides. It is to be understood that the scope of the invention is not limited to these compounds, but rather encompasses derivatives and analogs of these compounds, or compounds obtained from different starting materials. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
     
     In certain other embodiments, the inventive compounds belong to class (Ic) and subclasses thereof, as described herein. Schemes 7-10 depict the synthesis of exemplary types of compounds of this class (for example Amine Esters, Amine Acids and Amine Amides of general structure 42, 43 and 45, respectively, as seen in Scheme 7). In certain embodiments, the compounds of the invention comprise a nitrogen-containing heterocyclic N-terminal moiety. For example, the heterocyclic moiety may be a piperidine ring (Schemes 7, 8 and 9) or a thiazolidine ring (Scheme 10). Examples of other suitable moieties are described in the Exemplification herein, or will be apparent to the person of ordinary skill in the art. As dicussed above, R may be a nitrogen-containing heteroalkyl moiety (Scheme 7) or an unsaturated alkyl moiety (Schemes 8, 9 and 10). 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
     
     The skilled practitioner will recognize that the synthetic methodology may be applied to pipecolic acid analogs other than those depicted in Scheme 9. For example, the methodology may be used for pipecolic acid analogs having a different substitution pattern on the piperidine ring (e.g., other than 4-methyl) and/or analogs where the piperidine nitrogen atom may be substituted with a group other than methyl (e.g., ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —CH(CH 3 ) 2 CH 2 CH 3 , —CH(CH 3 )cyclobutyl, —CH(Et) 2 , —CH(CH 3 ) 2 C CH, cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl). 
     
       
         
         
             
             
         
       
     
     In certain other embodiments, the inventive compounds belong to class (Id) and subclasses thereof, as described herein. One skilled in the art would appreciate that the exemplary heterocyclic starting materials described in Schemes 7-10, that are used in the preparation of compounds of class (Ic) (namely compounds 38, 60 or 65) could be substituted for acyclic α-amino acid moieties to access compounds of class (Id), as illustrated in Scheme 11 below: 
     
       
         
         
             
             
         
       
     
     For example, reaction of diethylglycine (72) with amine HCl salt 49 gives the N-terminal gem-diethyl ethyl ester 73, or the corresponding carboxylic acid 74, after hydrolysis under suitable conditions (Scheme 12). 
     
       
         
         
             
             
         
       
     
     In certain other embodiments, there is provided a method for preparing compounds of formula VI A : 
     
       
         
         
             
             
         
       
         
         
           
             wherein L, R 9a -R 10a , R G1 , R M1  and R M2  are as defined above and in subclasses herein; g is 1 or 2; Q is OR Q′ , wherein R Q′  is hydrogen, lower alkyl or an oxygen protecting group; and R 2  and R 6  are independently substituted or unsubstituted linear or branched lower alkyl. In certain embodiments, compounds of formula (VI A ) may be prepared according to the methodology depicted in Scheme 13: 
           
         
       
    
     
       
         
         
             
             
         
       
     
     Alternatively, or additionally, compounds of formula (VI A ) may be prepared according to the methodology depicted in Scheme 14: 
     
       
         
         
             
             
         
       
     
     In certain embodiments, compound 92 may be prepared according to the methodology depicted in Scheme 15: 
     
       
         
         
             
             
         
       
     
     In certain other embodiments, compound 92 may be prepared according to the methodology depicted in Scheme 16: 
     
       
         
         
             
             
         
       
     
     In certain embodiments, compound 95 may be prepared according to the methodology depicted in Scheme 17: 
     
       
         
         
             
             
         
       
     
     In certain other embodiments, compound 95 may be prepared from intermediate 108 according to the methodology depicted in Scheme 18: 
     
       
         
         
             
             
         
       
     
     In certain embodiments, for the compounds depicted in Schemes 13-18, R 6  is substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl. In certain exemplary embodiments, R 6  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl. In certain other exemplary embodiments, R 6  is tert-butyl. 
     In certain embodiments, for the compounds depicted in Schemes 13-18, R 10a  is hydrogen or substituted or unsubstituted, linear or branched, cyclic or acyclic, or saturated or unsaturated lower alkyl. In certain exemplary embodiments, R 10a  is linear or branched lower alkyl. In certain other exemplary embodiments, R 10a  is methyl. 
     In certain embodiments, for the compounds depicted in Schemes 13-18, the moiety having the structure: 
                         
has the following structure:
 
                         
wherein R 2  is substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl, heteroalkyl, -alkyl(aryl) or acyl. In certain exemplary embodiments, R 2  is substituted or unsusbtituted, linear or branched, cyclic or acyclic, saturated or unsaturated lower alkyl. In certain other exemplary embodiments, R 2  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , —C(CH 3 ) 2 C≡CH, cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl.
 
     In certain embodiments, for the compounds depicted in Schemes 13-18, R 6  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl; R 10a  is methyl; and the moiety having the structure: 
                         
has the following structure:
 
                         
wherein R 2  is methyl, ethyl, propyl, butyl, pentyl, tert-butyl, i-propyl, —CH(CH 3 )Et, —CH(CH 3 )CH 2 CH 2 CH 3 , —CH(CH 3 )CH 2 CH 2 CH 2 CH 3 , —CH 2 CH(CH 3 ) 2 , —CH(CH 3 )CH(CH 3 ) 2 , —C(CH 3 ) 2 Et, —CH(CH 3 )cyclobutyl, —CH(Et) 2 , —C(CH 3 ) 2 C≡CH, cyclohexyl, cyclopentyl, cyclobutyl or cyclopropyl.
 
     The exemplary methodologies depicted in Schemes 13-18 are not intended to limit the scope of the invention. Other synthetic approaches will be apparent to the skilled practitioner. 
     It will be appreciated that each of the reactions described in Schemes 2-18 above can be carried out using reagents and conditions as described for the synthesis of various types of exemplary compounds described above, or they may be modified using other available reagents or starting materials. For example, a variety of amide formation conditions, esterification, hydrolysis and aromatic nucleus functionalization conditions are well-known in the art and can be utilized in the method of the invention. See, generally, March, Advanced Organic Chemistry, 5 th  ed., John Wiley &amp; Sons, 2001; and “Comprehensive Organic Transformations, a guide to functional group preparations”, Richard C. Larock, VCH publishers, 1999; the entire contents of which are incorporated herein by reference. 
     As mentioned above, it will be appreciated that the invention is not limited in scope to the compounds recited herein. Synthetic strategies or starting materials other than those described herein may be used to prepare compounds of general structure I). It will also be appreciated that each of the components/starting materials used in the synthesis of the compounds of the invention can be diversified either before synthesis or alternatively after the construction of the peptide construct. As used herein, the term “diversifying” or “diversify” means reacting an inventive compound, as defined herein, at one or more reactive sites to modify a functional moiety or to add a functional moiety. For example, where an aromatic ring is present in the compound, the aromatic ring can be diversified (prior to or after reaction) to either add functionality (e.g., where hydrogen is present, a halogen or other functionality can be added) or to modify functionality (e.g., where a hydroxyl group is present on the aromatic ring, the aromatic ring can be diversified by reacting with a reagent to protect the hydroxyl group, or to convert it into an aliphatic or heteroaliphatic moiety). Described generally below are a variety of schemes to assist the reader in the synthesis of a variety of analogues, either by diversification of the intermediate components or by diversification of the peptide construct. 
     In certain embodiments, the preparation of chemically diverse derivatives may be achieved by diversifying the C-terminal moiety of the compounds. For example, where the C-terminal moiety is a carboxylic acid, examples of chemical transformations suitable to achieve such derivatization include, but are not limited to, reduction to the corresponding aldehyde or alcohol, amidation, Wittig reaction, decarboxylation, esterification, addition of nucleophiles, conversion to ketones, imines, hydrazones, azides, etc. . . . Examples of such transformations are depicted in Schemes 19 and 20. One skilled in the art will recognize that possible chemical transformations suitable to achieve diversification of the compounds of the invention are not limited to those depicted in Schemes 19 and 20. Rather, any suitable synthetic methods known in the art can be used to achieve desired chemical transformations. 
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     4) Research Uses, Formulation and Administration 
     According to the present invention, the inventive compounds may be assayed in any of the available assays known in the art for identifying compounds having a pre-determined biological activity. For example, the assay may be cellular or non-cellular, in vivo or in vitro, high- or low-throughput format, etc. In certain exemplary embodiments, the inventive compounds are tested in assays to identify those compounds having cytotoxic or growth inhibitory effect in vitro, or cause tumor regression and/or inhibition of tumor growth in vivo. 
     Compounds of this invention which are of particular interest include those which:
         exhibit cytotoxic and/or growth inhibitory effect on cancer cell lines maintained in vitro or in animal studies using a scientifically acceptable cancer cell xenograft model;   preferably cause tumor regression in vivo;   exhibit low sensitivity to MDR;   exhibit low cytotoxicity to non-dividing normal cells; and/or   exhibit a favorable therapeutic profile (e.g., safety, efficacy, and stability).       

     As detailed in the exemplification herein, in assays to determine the ability of compounds to inhibit the growth of tumor cell lines in vitro, certain inventive compounds exhibited IC 50  values≦10 μM. In other embodiments, compounds of the invention exhibit IC 50  values≦5 μM. In other embodiments, compounds of the invention exhibit IC 50  values≦1 μM. In other embodiments, compounds of the invention exhibit IC 50  values≦750 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦500 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦250 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦100 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦50 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦25 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦10 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦7.5 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦5 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦2.5 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦1 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦0.75 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦0.5 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦0.25 nM. In other embodiments, compounds of the invention exhibit IC 50  values≦0.1 nM. In certain embodiments, compounds of the invention exhibit growth inhibition IC 50  values in cultured human cancer cells in the range of 0.1 nM-10 nM. 
     In certain other embodiments, compounds of the invention exhibit low sensitivity to MDR. In certain exemplary embodiments, compounds of the invention have a ratio [cell growth inhibition in MDR-positive cells]/[cell growth inhibition in MDR-negative cells] (i.e., resistance ratio)≦10. In certain exemplary embodiments, compounds of the invention have a resistance ratio≦9. In certain exemplary embodiments, compounds of the invention have a resistance ratio≦8. In certain exemplary embodiments, compounds of the invention have a resistance ratio≦7. In certain exemplary embodiments, compounds of the invention have a resistance ratio≦6. In certain exemplary embodiments, compounds of the invention have a resistance ratio≦5. In certain exemplary embodiments, compounds of the invention have a resistance ratio≦4. 
     In certain other embodiments, compounds of the invention exhibit low cytotoxicity to non-dividing normal cells. In certain exemplary embodiments, inventive compounds exhibit little or no cytotoxicity in non-dividing normal cells at concentrations≧1000 fold the concentration at which they inhibit cancer cell growth. In certain exemplary embodiments, inventive compounds exhibit little or no cytotoxicity in non-dividing normal cells at concentrations in the range of up to 1-10 μM. 
     In certain embodiments, inventive compounds exhibit stability in mouse serum. 
     In certain embodiments, inventive compounds exhibit a low mitotic block reversibility ratio. In certain embodiments, inventive compounds exhibit mitotic block reversibility ratios of 1 to about 30. In certain embodiments, inventive compounds exhibit mitotic block reversibility ratios of 1 to about 25. In certain embodiments, inventive compounds exhibit mitotic block reversibility ratios of 1 to about 20. In certain embodiments, inventive compounds exhibit mitotic block reversibility ratios of 1 to about 15. In certain embodiments, inventive compounds exhibit mitotic block reversibility ratios of 1 to about 10. In certain embodiments, inventive compounds exhibit mitotic block reversibility ratios of 1 to about 5. In certain embodiments, inventive compounds exhibit mitotic block reversibility ratios of 1 to about 3. 
     In certain embodiments, compounds of the invention cause tumor regression in vivo. In certain exemplary embodiments, compounds of the invention cause tumor regression in vivo in suitable mouse tumor xenograph models. In certain exemplary embodiments, compounds of the invention cause reduction of tumor size to below 70% of the size at the start of compound administration in a suitable cancer cell xenograft model. In certain exemplary embodiments, compounds of the invention cause reduction of tumor size to below 65% of the size at the start of compound administration in a suitable cancer cell xenograft model. In certain exemplary embodiments, compounds of the invention cause reduction of tumor size to below 60% of the size at the start of compound administration in a suitable cancer cell xenograft model. In certain exemplary embodiments, compounds of the invention cause reduction of tumor size to below 55% of the size at the start of compound administration in a suitable cancer cell xenograft model. In certain exemplary embodiments, compounds of the invention cause reduction of tumor size to below 50% of the size at the start of compound administration in a suitable cancer cell xenograft model. In certain exemplary embodiments, compounds of the invention cause tumor regression in certain multidrug resistant xenograph models. 
     In certain exemplary embodiments, compounds of the invention cause inhibition of tumor growth in vivo. In certain exemplary embodiments, compounds of the invention cause significant inhibition of tumor growth in suitable cancer cell xenograft models. In certain exemplary embodiments, compounds of the invention cause significant inhibition of tumor growth in suitable multidrug resistant cancer cell xenograft models. In certain exemplary embodiments, compounds of the invention cause inhibition of tumor growth in treated animals by &gt;50% compared to that of control aninals (i.e., “treated” tumor size&lt;50% “control” tumor size; or T/C value&lt;50%) in suitable cancer cell xenograft models. In certain embodiments, compounds of the invention have T/C values&lt;70%. In certain embodiments, compounds of the invention have T/C values&lt;65%. In certain embodiments, compounds of the invention have T/C values&lt;60%. In certain embodiments, compounds of the invention have T/C values&lt;55%. 
     In certain embodiments, compounds of the invention inhibit the growth of human cancer cells in vitro, exhibit low sensitivity to MDR (e.g., low resistance ratio), exhibit low cytotoxicity to non-dividing normal cells, exhibit stability in mouse serum, have a low mitotic block reversibility ratio, cause tumor regression in vivo, and/or cause inhibition of tumor growth in vivo. 
     In certain embodiments, compounds of the invention inhibit the growth of human cancer cells in vitro, exhibit low sensitivity to MDR (e.g., low resistance ratio), exhibit low cytotoxicity to non-dividing normal cells, exhibit stability in mouse serum, have a low mitotic block reversibility ratio, cause tumor regression in vivo, and cause inhibition of tumor growth in vivo. 
     In certain embodiments, compounds of the invention have any one or more of the following properties:
         (i) exhibit growth inhibition IC 50  values in cultured human cancer cells in the range of 0.1 nM-10 nM;   (ii) have a resistance ratio preferably ≦10, preferably ≦9, preferably ≦8, preferably ≦7, preferably ≦6, preferably ≦5, more preferably ≦4;   (iii) exhibit little or no cytotoxicity in non-dividing normal cells at concentrations in the range of up to 1-10 μM;   (iv) exhibit stability in mouse serum;   (v) exhibit mitotic block reversibility ratios of 1 to about 30, preferably of 1 to about 25, preferably of 1 to about 20, preferably of 1 to about 15, preferably of 1 to about 10, preferably of 1 to about 5, most preferably of about 1 to about 3;   (vi) cause reduction of tumor size to below 70%, preferably below 65%, preferably below 60%, preferably below 55%, most preferably below 50%, of the size at the start of compound administration in suitable cancer cell xenograft models; and/or   (vii) cause significant inhibition of tumor growth in suitable cancer cell xenograft model (e.g., T/C value preferably &lt;70%, preferably &lt;65%, preferably &lt;60%, preferably &lt;55%, most preferably &lt;50%).       

     In certain embodiments, compounds of the invention have the following properties:
         (i) exhibit growth inhibition IC 50  values in cultured human cancer cells in the range of 0.1 nM-10 nM;   (ii) have a resistance ratio preferably ≦10, preferably ≦9, preferably ≦8, preferably ≦7, preferably ≦6, preferably ≦5, more preferably ≦4;   (iii) exhibit little or no cytotoxicity in non-dividing normal cells at concentrations in the range of up to 1-10 μM;   (iv) exhibit stability in mouse serum;   (v) exhibit mitotic block reversibility ratios of 1 to about 30, preferably of 1 to about 25, preferably of 1 to about 20, preferably of 1 to about 15, preferably of 1 to about 10, preferably of 1 to about 5, most preferably of about 1 to about 3;   (vi) cause reduction of tumor size to below 70%, preferably below 65%, preferably below 60%, preferably below 55%, most preferably below 50%, of the size at the start of compound administration in suitable cancer cell xenograft models; and   (vii) cause significant inhibition of tumor growth in suitable cancer cell xenograft model (e.g., T/C value preferably &lt;70%, preferably &lt;65%, preferably &lt;60%, preferably &lt;55%, most preferably &lt;50%).       

     Examples of compounds exhibiting desired properties include ER-805913, ER-805736, ER-807102, ER-807328, ER-806925, ER-807850, ER-807904, ER-807974, ER-808368, ER-808662, ER-808824, and salts thereof (See Table below). 
     As discussed above, compounds of the invention exhibit activity for the inhibition of tumor cell growth. As such, the inventive compounds as useful for the treatment of a variety of disorders, including, but not limited to, glioblastoma, retinoblastoma, breast cancer, cervical cancer, colon and rectal cancer, leukemia, lung cancer (including, but not limited to small cell lung cancer), melanoma, multiple myeloma, non-Hodgkin&#39;s lymphoma, ovarian cancer, pancreatic cancer, prostate cancer and gastric cancer, to name a few. In certain embodiments, the inventive compounds are useful for the treatment of solid and non-solid tumors. In still other embodiments of interest, the inventive compounds are particularly useful for the treatment of breast cancer, prostate cancer, colon cancer, lung cancer, leukemia and lymphoma. 
     In certain embodiment, the method involves the administration of a therapeutically effective amount of the compound or a pharmaceutically acceptable derivative thereof to a subject (including, but not limited to a human or animal) in need of it. In certain embodiments, the inventive compounds as useful for the treatment of cancer (including, but not limited to, glioblastoma, retinoblastoma, breast cancer, cervical cancer, colon and rectal cancer, leukemia, lymphoma, lung cancer (including, but not limited to small cell lung cancer), melanoma and/or skin cancer, multiple myeloma, non-Hodgkin&#39;s lymphoma, ovarian cancer, pancreatic cancer, prostate cancer and gastric cancer, bladder cancer, uterine cancer, kidney cancer, testicular cancer, stomach cancer, brain cancer, liver cancer, or esophageal cancer). 
     Pharmaceutical Compositions 
     As discussed above this invention provides novel compounds that have biological properties useful for the treatment of cancer. In certain embodiments, certain of the compounds as described herein act as inhibitors of tumor growth and thus are useful in the treatment of cancer and in the inhibition of tumor growth and in the killing of cancer cells. In certain embodiments, the inventive compounds are useful for the treatment of solid tumors or non-solid tumors. In still other embodiments of interest, the inventive compounds are useful for the treatment of glioblastoma, retinoblastoma, breast cancer, cervical cancer, colon and rectal cancer, leukemia, lymphoma, lung cancer (including, but not limited to small cell lung cancer), melanoma, multiple myeloma, non-Hodgkin&#39;s lymphoma, ovarian cancer, pancreatic cancer, prostate cancer and gastric cancer, to name a few. The inventive compounds also find use in the prevention of restenosis of blood vessels subject to traumas such as angioplasty and stenting. 
     Accordingly, in another aspect of the present invention, pharmaceutical compositions are provided, which comprise any one of the compounds described herein (or a prodrug, pharmaceutically acceptable salt or other pharmaceutically acceptable derivative thereof), and optionally comprise a pharmaceutically acceptable carrier. In certain embodiments, the compounds are capable of inhibiting the growth of or killing cancer cells. In certain embodiments, these compositions optionally further comprise one or more additional therapeutic agents. Alternatively, a compound of this invention may be administered to a patient in need thereof in combination with the administration of one or more other therapeutic agents. For example, additional therapeutic agents for conjoint administration or inclusion in a pharmaceutical composition with a compound of this invention may be a cytotoxic agent or anticancer agent approved for the treatment of cancer, as discussed in more detail herein, or it may be any one of a number of agents undergoing approval in the Food and Drug Administration that ultimately obtain approval for the treatment of an immune disorder or cancer. It will also be appreciated that certain of the compounds of present invention can exist in free form for treatment, or where appropriate, as a pharmaceutically acceptable derivative thereof. According to the present invention, a pharmaceutically acceptable derivative includes, but is not limited to, pharmaceutically acceptable salts, esters, salts of such esters, or a prodrug or other adduct or derivative of a compound of this invention which upon administration to a patient in need is capable of providing, directly or indirectly, a compound as otherwise described herein, or a metabolite or residue thereof. 
     As used herein, the term “pharmaceutically acceptable salt” refers to those salts which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of humans and lower animals with little or no undue toxicity, irritation, allergic response and the like, and are commensurate with a reasonable benefit/risk ratio. Pharmaceutically acceptable salts of amines, carboxylic acids, and other types of compounds, are well known in the art. For example, S. M. Berge, et al. describe pharmaceutically acceptable salts in detail in  J. Pharmaceutical Sciences,  66: 1-19 (1977), incorporated herein by reference. The salts can be prepared in situ during the final isolation and purification of the compounds of the invention, or separately by reacting a free base or free acid function with a suitable reagent, as described generally below. For example, a free base function can be reacted with a suitable acid. Furthermore, where the compounds of the invention carry an acidic moiety, suitable pharmaceutically acceptable salts thereof may, include metal salts such as alkali metal salts, e.g. sodium or potassium salts; and alkaline earth metal salts, e.g. calcium or magnesium salts. Examples of pharmaceutically acceptable, nontoxic acid addition salts are salts of an amino group formed with inorganic acids such as hydrochloric acid, hydrobromic acid, phosphoric acid, sulfuric acid and perchloric acid or with organic acids such as acetic acid, oxalic acid, maleic acid, tartaric acid, citric acid, succinic acid or malonic acid or by using other methods used in the art such as ion exchange. Other pharmaceutically acceptable salts include adipate, alginate, ascorbate, aspartate, benzenesulfonate, benzoate, bisulfate, borate, butyrate, camphorate, camphorsulfonate, citrate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, formate, fumarate, glucoheptonate, glycerophosphate, gluconate, hemisulfate, heptanoate, hexanoate, hydroiodide, 2-hydroxy-ethanesulfonate, lactobionate, lactate, laurate, lauryl sulfate, malate, maleate, malonate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, nitrate, oleate, oxalate, palmitate, pamoate, pectinate, persulfate, 3-phenylpropionate, phosphate, picrate, pivalate, propionate, stearate, succinate, sulfate, tartrate, thiocyanate, p-toluenesulfonate, trifluoroacetate, undecanoate, valerate salts, and the like. Representative alkali or alkaline earth metal salts include sodium, lithium, potassium, calcium, magnesium, and the like. Further pharmaceutically acceptable salts include, when appropriate, nontoxic ammonium, quaternary ammonium, and amine cations formed using counterions such as halide, hydroxide, carboxylate, sulfate, phosphate, nitrate, loweralkyl sulfonate and aryl sulfonate. 
     Additionally, as used herein, the term “pharmaceutically acceptable ester” refers to esters that hydrolyze in vivo and include those that break down readily in the human body to leave the parent compound or a salt thereof. Suitable ester groups include, for example, those derived from pharmaceutically acceptable aliphatic carboxylic acids, particularly alkanoic, alkenoic, cycloalkanoic and alkanedioic acids, in which each alkyl or alkenyl moeity advantageously has not more than 6 carbon atoms. Examples of particular esters include formates, acetates, propionates, butyrates, acrylates and ethylsuccinates. 
     Furthermore, the term “pharmaceutically acceptable prodrugs” as used herein refers to those prodrugs of the compounds of the present invention which are, within the scope of sound medical judgment, suitable for use in contact with the issues of humans and lower animals with undue toxicity, irritation, allergic response, and the like, commensurate with a reasonable benefit/risk ratio, and effective for their intended use, as well as the zwitterionic forms, where possible, of the compounds of the invention. The term “prodrug” refers to compounds that are rapidly transformed in vivo to yield the parent compound of the above formula, for example by hydrolysis in blood. A thorough discussion is provided in T. Higuchi and V. Stella, Pro-drugs as Novel Delivery Systems, Vol. 14 of the A.C.S. Symposium Series, and in Edward B. Roche, ed., Bioreversible Carriers in Drug Design, American Pharmaceutical Association and Pergamon Press, 1987, both of which are incorporated herein by reference. 
     As described above, the pharmaceutical compositions of the present invention additionally comprise a pharmaceutically acceptable carrier, which, as used herein, includes any and all solvents, diluents, or other liquid vehicle, dispersion or suspension aids, surface active agents, isotonic agents, thickening or emulsifying agents, preservatives, solid binders, lubricants and the like, as suited to the particular dosage form desired. Remington&#39;s Pharmaceutical Sciences, Sixteenth Edition, E. W. Martin (Mack Publishing Co., Easton, Pa., 1980) discloses various carriers used in formulating pharmaceutical compositions and known techniques for the preparation thereof. Except insofar as any conventional carrier medium is incompatible with the compounds of the invention, such as by producing any undesirable biological effect or otherwise interacting in a deleterious manner with any other component(s) of the pharmaceutical composition, its use is contemplated to be within the scope of this invention. Some examples of materials which can serve as pharmaceutically acceptable carriers include, but are not limited to, sugars such as lactose, glucose and sucrose; starches such as corn starch and potato starch; cellulose and its derivatives such as sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; powdered tragacanth; malt; gelatine; talc; excipients such as cocoa butter and suppository waxes; oils such as peanut oil, cottonseed oil; safflower oil, sesame oil; olive oil; corn oil and soybean oil; glycols; such as propylene glycol; esters such as ethyl oleate and ethyl laurate; agar; buffering agents such as magnesium hydroxide and aluminum hydroxide; alginic acid; pyrogenfree water; isotonic saline; Ringer&#39;s solution; ethyl alcohol, and phosphate buffer solutions, as well as other non-toxic compatible lubricants such as sodium lauryl sulfate and magnesium stearate, as well as coloring agents, releasing agents, coating agents, sweetening, flavoring and perfuming agents, preservatives and antioxidants can also be present in the composition, according to the judgment of the formulator. 
     Uses and Formulations of Compounds of the Invention 
     As described in more detail herein, in general, the present invention provides compounds useful for the treatment of cancer and proliferative disorders. 
     As discussed above, certain of the compounds as described herein act as inhibitors of tumor growth and thus are useful in the treatment of cancer and in the inhibition of tumor growth and in the killing of cancer cells. The invention further provides a method for inhibiting tumor growth and/or tumor metastasis. The method involves the administration of a therapeutically effective amount of the compound or a pharmaceutically acceptable derivative thereof to a subject (including, but not limited to a human or animal) in need of it. In certain embodiments, the inventive compounds are useful for the treatment of solid tumors or non-solid tumors. In still other embodiments of interest, the inventive compounds are useful for the treatment of glioblastoma, retinoblastoma, breast cancer, cervical cancer, colon and rectal cancer, leukemia, lymphoma, lung cancer (including, but not limited to small cell lung cancer), melanoma, multiple myeloma, non-Hodgkin&#39;s lymphoma, ovarian cancer, pancreatic cancer, prostate cancer and gastric cancer, to name a few. 
     As described in more detail herein, in general, the present invention provides compounds useful for the treatment of cancer, particularly solid and non-solid tumors. Specifically, certain compounds of the invention have been shown to inhibit the growth of certain tumor cell lines in vitro, as described in more detail herein, and are useful for the treatment of cancer, including solid and non-solid tumors. 
     As discussed above, the inventive compounds also find use in the prevention of restenosis of blood vessels subject to traumas such as angioplasty and stenting. For example, it is contemplated that the compounds of the invention will be useful as a coating for implanted medical devices, such as tubings, shunts, catheters, artificial implants, pins, electrical implants such as pacemakers, and especially for arterial or venous stents, including balloon-expandable stents. In certain embodiments inventive compounds may be bound to an implantable medical device, or alternatively, may be passively adsorbed to the surface of the implantable device. In certain other embodiments, the inventive compounds may be formulated to be contained within, or, adapted to release by a surgical or medical device or implant, such as, for example, stents, sutures, indwelling catheters, prosthesis, and the like. 
     In certain exemplary embodiments, the inventive compounds may be used as coating for stents. A stent is typically an open tubular structure that has a pattern (or patterns) of apertures extending from the outer surface of the stent to the lumen. It is commonplace to make stents of biocompatible metallic materials, with the patterns cut on the surface with a laser machine. The stent can be electro-polished to minimize surface irregularities since these irregularities can trigger an adverse biological response. However, stents may still stimulate foreign body reactions that result in thrombosis or restenosis. To avoid these complications, a variety of stent coatings and compositions have been proposed in the prior art literature both to reduce the incidence of these complications or other complications and restore tissue function by itself or by delivering therapeutic compound to the lumen. For example, drugs having antiproliferative and anti-inflammatory activities have been evaluated as stent coatings, and have shown promise in preventing retenosis (See, for example, Presbitero P. et al., “Drug eluting stents do they make the difference?”,  Minerva Cardioangiol,  2002, 50(5):431-442; Ruygrok P. N. et al., “Rapamycin in cardiovascular medicine”,  Intern. Med. J.,  2003, 33(3):103-109; and Marx S. O. et al., “Bench to bedside: the development of rapamycin and its application to stent restenosis”,  Circulation,  2001, 104(8):852-855, each of these references is incorporated herein by reference in its entirety). Accordingly, without wishing to be bound to any particular theory, Applicant proposes that the inventive compounds, having antiproliferative effects, can be used as stent coatings and/or in stent drug delivery devices, inter alia for the prevention of restenosis. A variety of compositions and methods related to stent coating and/or local stent drug delivery for preventing restenosis are known in the art (see, for example, U.S. Pat. Nos. 6,517,889; 6,273,913; 6,258,121; 6,251,136; 6,248,127; 6,231,600; 6,203,551; 6,153,252; 6,071,305; 5,891,507; 5,837,313 and published U.S. patent application No.: US2001/0027340, each of which is incorporated herein by reference in its entirety). For example, stents may be coated with polymer-drug conjugates by dipping the stent in polymer-drug solution or spraying the stent with such a solution. In certain embodiment, suitable materials for the implantable device include biocompatible and nontoxic materials, and may be chosen from the metals such as nickel-titanium alloys, steel, or biocompatible polymers, hydrogels, polyurethanes, polyethylenes, ethylenevinyl acetate copolymers, etc. In certain embodiments, the inventive compound, is coated onto a stent for insertion into an artery or vein following balloon angioplasty. 
     The invention may be described therefore, in certain broad aspects as a method of inhibiting arterial restenosis or arterial occlusion following vascular trauma comprising administering to a subject in need thereof, a composition comprising an inventive compound conjugated to a suitable polymer or polymeric material. In the practice of the method, the subject may be a coronary bypass, vascular surgery, organ transplant or coronary or any other arterial angioplasty patient, for example, and the composition may be administered directly, intravenously, or even coated on a stent to be implanted at the sight of vascular trauma. 
     In another aspect, the invention encompasses implants and surgical or medical devices, including stents and grafts, coated with or otherwise constructed to contain and/or release any of the inventive compounds disclosed herein. In certain embodiments, the compounds have antiproliferative activity. In certain other embodiments, the compounds inhibit smooth muscle cell proliferation. Representative examples of the inventive implants and surgical or medical devices include cardiovascular devices (e.g., implantable venous catheters, venous ports, tunneled venous catheters, chronic infusion lines or ports, including hepatic artery infusion catheters, pacemaker wires, implantable defibrillators); neurologic/neurosurgical devices (e.g., ventricular peritoneal shunts, ventricular atrial shunts, nerve stimulator devices, dural patches and implants to prevent epidural fibrosis post-laminectomy, devices for continuous subarachnoid infusions); gastrointestinal devices (e.g., chronic indwelling catheters, feeding tubes, portosystemic shunts, shunts for ascites, peritoneal implants for drug delivery, peritoneal dialysis catheters, implantable meshes for hernias, suspensions or solid implants to prevent surgical adhesions, including meshes); genitourinary devices (e.g., uterine implants, including intrauterine devices (IUDs) and devices to prevent endometrial hyperplasia, fallopian tubal implants, including reversible sterilization devices, fallopian tubal stents, artificial sphincters and periurethral implants for incontinence, ureteric stents, chronic indwelling catheters, bladder augmentations, or wraps or splints for vasovasostomy); phthalmologic implants (e.g., multino implants and other implants for neovascular glaucoma, drug eluting contact lenses for pterygiums, splints for failed dacrocystalrhinostomy, drug eluting contact lenses for corneal neovascularity, implants for diabetic retinopathy, drug eluting contact lenses for high risk corneal transplants); otolaryngology devices (e.g., ossicular implants, Eustachian tube splints or stents for glue ear or chronic otitis as an alternative to transtempanic drains); plastic surgery implants (e.g., prevention of fibrous contracture in response to gel- or saline-containing breast implants in the subpectoral or subglandular approaches or post-mastectomy, or chin implants), and orthopedic implants (e.g., cemented orthopedic prostheses). 
     Implants and other surgical or medical devices may be coated with (or otherwise adapted to release) compositions of the present invention in a variety of manners, including for example: (a) by directly affixing to the implant or device an inventive compound or composition (e.g., by either spraying the implant or device with a polymer/drug film, or by dipping the implant or device into a polymer/drug solution, or by other covalent or noncovalent means); (b) by coating the implant or device with a substance such as a hydrogel which will in turn absorb the inventive compound or composition; (c) by interweaving inventive compound- or composition-coated thread (or the polymer itself formed into a thread) into the implant or device; (d) by inserting the implant or device into a sleeve or mesh which is comprised of or coated with an inventive compound or composition; (e) constructing the implant or device itself with an inventive compound or composition; or (f) by otherwise adapting the implant or device to release the inventive compound. In certain embodiments, the composition should firmly adhere to the implant or device during storage and at the time of insertion. The inventive compound or composition should also preferably not degrade during storage, prior to insertion, or when warmed to body temperature after insertion inside the body (if this is required). In addition, it should preferably coat the implant or device smoothly and evenly, with a uniform distribution of inventive compound, while not changing the stent contour. Within preferred embodiments of the invention, the inventive implant or device should provide a uniform, predictable, prolonged release of the inventive compound or composition into the tissue surrounding the implant or device once it has been deployed. For vascular stents, in addition to the above properties, the composition should not render the stent thrombogenic (causing blood clots to form), or cause significant turbulence in blood flow (more than the stent itself would be expected to cause if it was uncoated). 
     In the case of stents, a wide variety of stents may be developed to contain and/or release the inventive compounds or compositions provided herein, including esophageal stents, gastrointestinal stents, vascular stents, biliary stents, colonic stents, pancreatic stents, ureteric and urethral stents, lacrimal stents, Eustachian tube stents, fallopian tube stents and tracheal/bronchial stents (See, for example, U.S. Pat. No. 6,515,016, the entire contents of which are incorporated herein by reference). Stents may be readily obtained from commercial sources, or constructed in accordance with well-known techniques. Representative examples of stents include those described in U.S. Pat. No. 4,768,523, entitled “Hydrogel Adhesive”; U.S. Pat. No. 4,776,337, entitled “Expandable Intraluminal Graft, and Method and Apparatus for Implanting and Expandable Intraluminal Graft”; U.S. Pat. No. 5,041,126 entitled “Endovascular Stent and Delivery System”; U.S. Pat. No. 5,052,998 entitled “Indwelling Stent and Method of Use”; U.S. Pat. No. 5,064,435 entitled “Self-Expanding Prosthesis Having Stable Axial Length”; U.S. Pat. No. 5,089,606, entitled “Water-insoluble Polysaccharide Hydrogel Foam for Medical Applications”; U.S. Pat. No. 5,147,370, entitled “Nitinol Stent for Hollow Body Conduits”; U.S. Pat. No. 5,176,626, entitled “Indwelling Stent”; U.S. Pat. No. 5,213,580, entitled “Biodegradable Polymeric Endoluminal Sealing Process”; and U.S. Pat. No. 5,328,471, entitled “Method and Apparatus for Treatment of Focal Disease in Hollow Tubular Organs and Other Tissue Lumens.” 
     As discussed above, the stent coated with (or otherwise adapted to release) compositions of the present invention may be used to eliminate a vascular obstruction and prevent restenosis and/or reduce the rate of restenosis. Within other aspects of the present invention, stents coated with (or otherwise adapted to release) compositions of the present invention are provided for expanding the lumen of a body passageway. Specifically, a stent having a generally tubular structure, and a surface coated with (or otherwise adapted to release) an inventive compound or composition may be inserted into the passageway, such that the passageway is expanded. In certain embodiments, the stent coated with (or otherwise adapted to release) compositions of the present invention may be used to eliminate a biliary, gastrointestinal, esophageal, tracheal/bronchial, urethral or vascular obstruction. 
     In another aspect of the invention, methods for the treatment of cancer are provided comprising administering a therapeutically effective amount of a compound of formula (I), as described herein, to a subject in need thereof. In certain embodiments, the inventive compounds are useful for the treatment of solid and non-solid tumors. It will be appreciated that the compounds and compositions, according to the method of the present invention, may be administered using any amount and any route of administration effective for the treatment of cancer. Thus, the expression “effective amount” as used herein, refers to a sufficient amount of agent to kill or inhibit the growth of tumor cells, or refers to a sufficient amount to reduce the growth of tumor cells. The exact amount required will vary from subject to subject, depending on the species, age, and general condition of the subject, the severity of the infection, the particular anticancer agent, its mode of administration, and the like. The compounds of the invention are preferably formulated in dosage unit form for ease of administration and uniformity of dosage. The expression “dosage unit form” as used herein refers to a physically discrete unit of therapeutic agent appropriate for the patient to be treated. It will be understood, however, that the total daily usage of the compounds and compositions of the present invention will be decided by the attending physician within the scope of sound medical judgment. The specific therapeutically effective dose level for any particular patient or organism will depend upon a variety of factors including the disorder being treated and the severity of the disorder; the activity of the specific compound employed; the specific composition employed; the age, body weight, general health, sex and diet of the patient; the time of administration, route of administration, and rate of excretion of the specific compound employed; the duration of the treatment; drugs used in combination or coincidental with the specific compound employed; and like factors well known in the medical arts (see, for example, Goodman and Gilman&#39;s, “The Pharmacological Basis of Therapeutics”, Tenth Edition, A. Gilman, J. Hardman and L. Limbird, eds., McGraw-Hill Press, 155-173, 2001, which is incorporated herein by reference in its entirety). 
     In certain other embodiments, methods are provided for using the inventive implants and other surgical or medical devices coated with (or otherwise adapted to release) compounds and compositions of the present invention. In certain embodiments, methods are provided for preventing restenosis, comprising inserting a stent into an obstructed blood vessel, the stent having a generally tubular structure, the surface of the structure being coated with (or otherwise adapted to release) an inventive compound or composition, such that the obstruction is eliminated and the inventive compound or composition is delivered in amounts effective to prevent restenosis and/or reduce the rate of restenosis. In other embodiments, methods are provided for preventing restenosis, comprising inserting a stent into an obstructed blood vessel, the stent having a generally tubular structure, the surface of the structure being coated with (or otherwise adapted to release) an inventive compound or composition, such that the obstruction is eliminated and the inventive compound or composition is delivered in amounts effective to inhibit smooth muscle cell proliferation. 
     Within other aspects of the present invention, methods are provided for expanding the lumen of a body passageway, comprising inserting a stent into the passageway, the stent having a generally tubular structure, the surface of the structure being coated with (or otherwise adapted to release) an inventive compound or composition, such that the passageway is expanded. In certain embodiments, the lumen of a body passageway is expanded in order to eliminate a biliary, gastrointestinal, esophageal, tracheal/bronchial, urethral and/or vascular obstruction. 
     In certain embodiments, methods are provided for eliminating biliary obstructions, comprising inserting a biliary stent into a biliary passageway, the stent having a generally tubular structure, the surface of the structure being coated with (or otherwise adapted to release) an inventive compound or composition, such that the biliary obstruction is eliminated. Briefly, tumor overgrowth of the common bile duct results in progressive cholestatic jaundice which is incompatible with life. Generally, the biliary system which drains bile from the liver into the duodenum is most often obstructed by (1) a tumor composed of bile duct cells (cholangiocarcinoma), (2) a tumor which invades the bile duct (e.g., pancreatic carcinoma), or (3) a tumor which exerts extrinsic pressure and compresses the bile duct (e.g., enlarged lymph nodes). Both primary biliary tumors, as well as other tumors which cause compression of the biliary tree may be treated utilizing stents Implants and other surgical or medical devices may be coated with (or otherwise adapted to release) compositions of the present invention. One example of primary biliary tumors are adenocarcinomas (which are also called Klatskin tumors when found at the bifurcation of the common hepatic duct). These tumors are also referred to as biliary carcinomas, choledocholangiocarcinomas, or adenocarcinomas of the biliary system. Benign tumors which affect the bile duct (e.g., adenoma of the biliary system), and, in rare cases, squamous cell carcinomas of the bile duct and adenocarcinomas of the gallbladder, may also cause compression of the biliary tree and therefore, result in biliary obstruction. Compression of the biliary tree is most commonly due to tumors of the liver and pancreas which compress and therefore obstruct the ducts. Most of the tumors from the pancreas arise from cells of the pancreatic ducts. This is a highly fatal form of cancer (5% of all cancer deaths; 26,000 new cases per year in the U.S.) with an average of 6 months survival and a 1 year survival rate of only 10%. When these tumors are located in the head of the pancreas they frequently cause biliary obstruction, and this detracts significantly from the quality of life of the patient. While all types of pancreatic tumors are generally referred to as “carcinoma of the pancreas” there are histologic subtypes including: adenocarcinoma, adenosquamous carcinoma, cystadenocarcinoma, and acinar cell carcinoma. Hepatic tumors, as discussed above, may also cause compression of the biliary tree, and therefore cause obstruction of the biliary ducts. 
     In certain embodiments, a biliary stent is first inserted into a biliary passageway in one of several ways: from the top end by inserting a needle through the abdominal wall and through the liver (a percutaneous transhepatic cholangiogram or “PTC”); from the bottom end by cannulating the bile duct through an endoscope inserted through the mouth, stomach, and duodenum (an endoscopic retrograde cholangiogram or “ERCP”); or by direct incision during a surgical procedure. In certain embodiments, a preinsertion examination, PTC, ERCP, or direct visualization at the time of surgery is performed to determine the appropriate position for stent insertion. A guidewire is then advanced through the lesion, and over this a delivery catheter is passed to allow the stent to be inserted in its collapsed form. If the diagnostic exam was a PTC, the guidewire and delivery catheter is inserted via the abdominal wall, while if the original exam was an ERCP the stent may be placed via the mouth. The stent is then positioned under radiologic, endoscopic, or direct visual control taking particular care to place it precisely across the narrowing in the bile duct. The delivery catheter is then removed leaving the stent standing as a scaffolding which holds the bile duct open. A further cholangiogram may be performed to document that the stent is appropriately positioned. 
     In certain embodiments, methods are provided for eliminating esophageal obstructions, comprising inserting an esophageal stent into an esophagus, the stent having a generally tubular structure, the surface of the structure being coated with (or otherwise adapted to release) an inventive compound or composition, such that the esophageal obstruction is eliminated. Briefly, the esophagus is the hollow tube which transports food and liquids from the mouth to the stomach. Cancer of the esophagus or invasion by cancer arising in adjacent organs (e.g., cancer of the stomach or lung) results in the inability to swallow food or saliva. In certain embodiments, a preinsertion examination, usually a barium swallow or endoscopy is performed in order to determine the appropriate position for stent insertion. A catheter or endoscope may then be positioned through the mouth, and a guidewire is advanced through the blockage. A stent delivery catheter is passed over the guidewire under radiologic or endoscopic control, and a stent is placed precisely across the narrowing in the esophagus. A post-insertion examination, usually a barium swallow x-ray, may be utilized to confirm appropriate positioning. 
     In certain embodiments, methods are provided for eliminating colonic obstructions, comprising inserting a colonic stent into a colon, the stent having a generally tubular structure, the surface of the structure being coated with (or otherwise adapted to release) an inventive compound or composition, such that the colonic obstruction is eliminated. Briefly, the colon is the hollow tube which transports digested food and waste materials from the small intestines to the anus. Cancer of the rectum and/or colon or invasion by cancer arising in adjacent organs (e.g., cancer of the uterus, ovary, bladder) results in the inability to eliminate feces from the bowel. In certain embodiments, a preinsertion examination, usually a barium enema or colonoscopy is performed in order to determine the appropriate position for stent insertion. A catheter or endoscope may then be positioned through the anus, and a guidewire is advanced through the blockage. A stent delivery catheter is passed over the guidewire under radiologic or endoscopic control, and a stent is placed precisely across the narrowing in the colon or rectum. A post-insertion examination, usually a barium enema x-ray, may be utilized to confirm appropriate positioning. 
     In certain embodiments, methods are provided for eliminating tracheal/bronchial obstructions, comprising inserting a tracheal/bronchial stent into a trachea or bronchi, the stent having a generally tubular structure, the surface of the structure being coated with (or otherwise adapted to release) an inventive compound or composition, such that the tracheal/bronchial obstruction is eliminated. Briefly, the trachea and bronchi are tubes which carry air from the mouth and nose to the lungs. Blockage of the trachea by cancer, invasion by cancer arising in adjacent organs (e.g., cancer of the lung), or collapse of the trachea or bronchi due to chondromalacia (weakening of the cartilage rings) results in inability to breathe. In certain embodiments, preinsertion examination, usually an endoscopy, is performed in order to determine the appropriate position for stent insertion. A catheter or endoscope is then positioned through the mouth, and a guidewire advanced through the blockage. A delivery catheter is then passed over the guidewire in order to allow a collapsed stent to be inserted. The stent is placed under radiologic or endoscopic control in order to place it precisely across the narrowing. The delivery catheter may then be removed leaving the stent standing as a scaffold on its own. A post-insertion examination, usually a bronchoscopy may be utilized to confirm appropriate positioning. 
     In certain embodiments, methods are provided for eliminating urethral obstructions, comprising inserting a urethral stent into a urethra, the stent having a generally tubular structure, the surface of the structure being coated with (or otherwise adapted to release) an inventive compound or composition, such that the urethral obstruction is eliminated. Briefly, the urethra is the tube which drains the bladder through the penis. Extrinsic narrowing of the urethra as it passes through the prostate, due to hypertrophy of the prostate, occurs in virtually every man over the age of 60 and causes progressive difficulty with urination. In certain embodiments, a preinsertion examination, usually an endoscopy or urethrogram is first performed in order to determine the appropriate position for stent insertion, which is above the external urinary sphincter at the lower end, and close to flush with the bladder neck at the upper end. An endoscope or catheter is then positioned through the penile opening and a guidewire advanced into the bladder. A delivery catheter is then passed over the guidewire in order to allow stent insertion. The delivery catheter is then removed, and the stent expanded into place. A post-insertion examination, usually endoscopy or retrograde urethrogram, may be utilized to confirm appropriate position. 
     In certain embodiments, methods are provided for eliminating vascular obstructions, comprising inserting a vascular stent into a blood vessel, the stent having a generally tubular structure, the surface of the structure being coated with (or otherwise adapted to release) an inventive compound or composition, such that the vascular obstruction is eliminated. Briefly, stents may be placed in a wide array of blood vessels, both arteries and veins, to prevent recurrent stenosis at the site of failed angioplasties, to treat narrowings that would likely fail if treated with angioplasty, and to treat post-surgical narrowings (e.g., dialysis graft stenosis). Suitable sites include, but are not limited to, the iliac, renal, and coronary arteries, the superior vena cava, and in dialysis grafts. In certain embodiments, angiography is first performed in order to localize the site for placement of the stent. This is typically accomplished by injecting radiopaque contrast through a catheter inserted into an artery or vein as an x-ray is taken. A catheter may then be inserted either percutaneously or by surgery into the femoral artery, brachial artery, femoral vein, or brachial vein, and advanced into the appropriate blood vessel by steering it through the vascular system under fluoroscopic guidance. A stent may then be positioned across the vascular stenosis. A post-insertion angiogram may also be utilized in order to confirm appropriate positioning. 
     Furthermore, after formulation with an appropriate pharmaceutically acceptable carrier in a desired dosage, the pharmaceutical compositions of this invention can be administered to humans and other animals orally, rectally, parenterally, intracisternally, intravaginally, intraperitoneally, topically (as by powders, ointments, or drops), bucally, as an oral or nasal spray, or the like, depending on the severity of the infection being treated. In certain embodiments, the compounds of the invention may be administered at dosage levels of about 0.001 mg/kg to about 50 mg/kg, from about 0.01 mg/kg to about 25 mg/kg, or from about 0.1 mg/kg to about 10 mg/kg of subject body weight per day, one or more times a day, to obtain the desired therapeutic effect. It will also be appreciated that dosages smaller than 0.001 mg/kg or greater than 50 mg/kg (for example 50-100 mg/kg) can be administered to a subject. In certain embodiments, compounds are administered orally or parenterally. 
     Liquid dosage forms for oral administration include, but are not limited to, pharmaceutically acceptable emulsions, microemulsions, solutions, suspensions, syrups and elixirs. In addition to the active compounds, the liquid dosage forms may contain inert diluents commonly used in the art such as, for example, water or other solvents, solubilizing agents and emulsifiers such as ethyl alcohol, isopropyl alcohol, ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propylene glycol, 1,3-butylene glycol, dimethylformamide, oils (in particular, cottonseed, groundnut, corn, germ, olive, castor, and sesame oils), glycerol, tetrahydrofurfuryl alcohol, polyethylene glycols and fatty acid esters of sorbitan, and mixtures thereof. Besides inert diluents, the oral compositions can also include adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring, and perfuming agents. 
     Injectable preparations, for example, sterile injectable aqueous or oleaginous suspensions may be formulated according to the known art using suitable dispersing or wetting agents and suspending agents. The sterile injectable preparation may also be a sterile injectable solution, suspension or emulsion in a nontoxic parenterally acceptable diluent or solvent, for example, as a solution in 1,3-butanediol. Among the acceptable vehicles and solvents that may be employed are water, Ringer&#39;s solution, U.S.P. and isotonic sodium chloride solution. In addition, sterile, fixed oils are conventionally employed as a solvent or suspending medium. For this purpose any bland fixed oil can be employed including synthetic mono- or diglycerides. In addition, fatty acids such as oleic acid are used in the preparation of injectables. 
     The injectable formulations can be sterilized, for example, by filtration through a bacterial-retaining filter, or by incorporating sterilizing agents in the form of sterile solid compositions which can be dissolved or dispersed in sterile water or other sterile injectable medium prior to use. 
     In order to prolong the effect of a drug, it is often desirable to slow the absorption of the drug from subcutaneous or intramuscular injection. This may be accomplished by the use of a liquid suspension or crystalline or amorphous material with poor water solubility. The rate of absorption of the drug then depends upon its rate of dissolution that, in turn, may depend upon crystal size and crystalline form. Alternatively, delayed absorption of a parenterally administered drug form is accomplished by dissolving or suspending the drug in an oil vehicle. Injectable depot forms are made by forming microencapsule matrices of the drug in biodegradable polymers such as polylactide-polyglycolide. Depending upon the ratio of drug to polymer and the nature of the particular polymer employed, the rate of drug release can be controlled. Examples of other biodegradable polymers include (poly(orthoesters) and poly(anhydrides). Depot injectable formulations are also prepared by entrapping the drug in liposomes or microemulsions which are compatible with body tissues. 
     Compositions for rectal or vaginal administration are preferably suppositories which can be prepared by mixing the compounds of this invention with suitable non-irritating excipients or carriers such as cocoa butter, polyethylene glycol or a suppository wax which are solid at ambient temperature but liquid at body temperature and therefore melt in the rectum or vaginal cavity and release the active compound. 
     Solid dosage forms for oral administration include capsules, tablets, pills, powders, and granules. In such solid dosage forms, the active compound is mixed with at least one inert, pharmaceutically acceptable excipient or carrier such as sodium citrate or dicalcium phosphate and/or a) fillers or extenders such as starches, lactose, sucrose, glucose, mannitol, and silicic acid, b) binders such as, for example, carboxymethylcellulose, alginates, gelatin, polyvinylpyrrolidinone, sucrose, and acacia, c) humectants such as glycerol, d) disintegrating agents such as agar-agar, calcium carbonate, potato or tapioca starch, alginic acid, certain silicates, and sodium carbonate, e) solution retarding agents such as paraffin, f) absorption accelerators such as quaternary ammonium compounds, g) wetting agents such as, for example, cetyl alcohol and glycerol monostearate, h) absorbents such as kaolin and bentonite clay, and i) lubricants such as talc, calcium stearate, magnesium stearate, solid polyethylene glycols, sodium lauryl sulfate, and mixtures thereof. In the case of capsules, tablets and pills, the dosage form may also comprise buffering agents. 
     Solid compositions of a similar type may also be employed as fillers in soft and hard-filled gelatin capsules using such excipients as lactose or milk sugar as well as high molecular weight polyethylene glycols and the like. The solid dosage forms of tablets, dragees, capsules, pills, and granules can be prepared with coatings and shells such as enteric coatings and other coatings well known in the pharmaceutical formulating art. They may optionally contain opacifying agents and can also be of a composition that they release the active ingredient(s) only, or preferentially, in a certain part of the intestinal tract, optionally, in a delayed manner. Examples of embedding compositions that can be used include polymeric substances and waxes. Solid compositions of a similar type may also be employed as fillers in soft and hard-filled gelatin capsules using such excipients as lactose or milk sugar as well as high molecular weight polethylene glycols and the like. 
     The active compounds can also be in micro-encapsulated form with one or more excipients as noted above. The solid dosage forms of tablets, dragees, capsules, pills, and granules can be prepared with coatings and shells such as enteric coatings, release controlling coatings and other coatings well known in the pharmaceutical formulating art. In such solid dosage forms the active compound may be admixed with at least one inert diluent such as sucrose, lactose and starch. Such dosage forms may also comprise, as in normal practice, additional substances other than inert diluents, e.g., tableting lubricants and other tableting aids such as magnesium stearate and microcrystalline cellulose. In the case of capsules, tablets and pills, the dosage forms may also comprise buffering agents. They may optionally contain opacifying agents and can also be of a composition that they release the active ingredient(s) only, or preferentially, in a certain part of the intestinal tract, optionally, in a delayed manner. Examples of embedding compositions which can be used include polymeric substances and waxes. 
     Dosage forms for topical or transdermal administration of a compound of this invention include ointments, pastes, creams, lotions, gels, powders, solutions, sprays, inhalants or patches. The active component is admixed under sterile conditions with a pharmaceutically acceptable carrier and any needed preservatives or buffers as may be required. Ophthalmic formulation, ear drops, and eye drops are also contemplated as being within the scope of this invention. Additionally, the present invention contemplates the use of transdermal patches, which have the added advantage of providing controlled delivery of a compound to the body. Such dosage forms are made by dissolving or dispensing the compound in the proper medium. Absorption enhancers can also be used to increase the flux of the compound across the skin. The rate can be controlled by either providing a rate controlling membrane or by dispersing the compound in a polymer matrix or gel. 
     It will also be appreciated that the compounds and pharmaceutical compositions of the present invention can be formulated and employed in combination therapies, that is, the compounds and pharmaceutical compositions can be formulated with or administered concurrently with, prior to, or subsequent to, one or more other desired therapeutics or medical procedures. The particular combination of therapies (therapeutics or procedures) to employ in a combination regimen will take into account compatibility of the desired therapeutics and/or procedures and the desired therapeutic effect to be achieved. It will also be appreciated that the therapies employed may achieve a desired effect for the same disorder (for example, an inventive compound may be administered concurrently with another anticancer agent), or they may achieve different effects (e.g., control of any adverse effects). For example, other therapies or anticancer agents that may be used in combination with the inventive anticancer agents of the present invention include surgery, radiotherapy (in but a few examples, γ-radiation, neutron beam radiotherapy, electron beam radiotherapy, proton therapy, brachytherapy, and systemic radioactive isotopes, to name a few), endocrine therapy, biologic response modifiers (interferons, interleukins, and tumor necrosis factor (TNF) to name a few), hyperthermia and cryotherapy, agents to attenuate any adverse effects (e.g., antiemetics), and other approved chemotherapeutic drugs, including, but not limited to, alkylating drugs (mechlorethamine, chlorambucil, Cyclophosphamide, Melphalan, Ifosfamide), antimetabolites (Methotrexate), purine antagonists and pyrimidine antagonists (6-Mercaptopurine, 5-Fluorouracil, Cytarabile, Gemcitabine), spindle poisons (Vinblastine, Vincristine, Vinorelbine, Paclitaxel), podophyllotoxins (Etoposide, Irinotecan, Topotecan), antibiotics (Doxorubicin, Bleomycin, Mitomycin), nitrosoureas (Carmustine, Lomustine), inorganic ions (Cisplatin, Carboplatin), enzymes (Asparaginase), and hormones (Tamoxifen, Leuprolide, Flutamide, and Megestrol), to name a few. For a more comprehensive discussion of updated cancer therapies see, The Merck Manual, Seventeenth Ed. 1999, the entire contents of which are hereby incorporated by reference. See also the National Cancer Institute (NCI) website (www.nci.nih.gov) and the Food and Drug Administration (FDA) website for a list of the FDA approved oncology drugs (www.fda.gov/cder/cancer/druglistframe—See Appendix A). 
     In certain embodiments, the pharmaceutical compositions of the present invention further comprise one or more additional therapeutically active ingredients (e.g., chemotherapeutic and/or palliative). For purposes of the invention, the term “Palliative” refers to treatment that is focused on the relief of symptoms of a disease and/or side effects of a therapeutic regimen, but is not curative. For example, palliative treatment encompasses painkillers, antinausea medications and anti-sickness drugs. In addition, chemotherapy, radiotherapy and surgery can all be used palliatively (that is, to reduce symptoms without going for cure; e.g., for shrinking tumors and reducing pressure, bleeding, pain and other symptoms of cancer). 
     TREATMENT KITS 
     In other embodiments, the present invention relates to a kit for conveniently and effectively carrying out the methods in accordance with the present invention. In general, the pharmaceutical pack or kit comprises one or more containers filled with one or more of the ingredients of the pharmaceutical compositions of the invention. Such kits are especially suited for the delivery of solid oral forms such as tablets or capsules. Such a kit preferably includes a number of unit dosages, and may also include a card having the dosages oriented in the order of their intended use. If desired, a memory aid can be provided, for example in the form of numbers, letters, or other markings or with a calendar insert, designating the days in the treatment schedule in which the dosages can be administered. Alternatively, placebo dosages, or calcium dietary supplements, either in a form similar to or distinct from the dosages of the pharmaceutical compositions, can be included to provide a kit in which a dosage is taken every day. Optionally associated with such container(s) can be a notice in the form prescribed by a governmental agency regulating the manufacture, use or sale of pharmaceutical products, which notice reflects approval by the agency of manufacture, use or sale for human administration. 
     EQUIVALENTS 
     The representative examples that follow are intended to help illustrate the invention, and are not intended to, nor should they be construed to, limit the scope of the invention. Indeed, various modifications of the invention and many further embodiments thereof, in addition to those shown and described herein, will become apparent to those skilled in the art from the full contents of this document, including the examples which follow and the references to the scientific and patent literature cited herein. It should further be appreciated that the contents of those cited references are incorporated herein by reference to help illustrate the state of the art. 
     The following examples contain important additional information, exemplification and guidance that can be adapted to the practice of this invention in its various embodiments and the equivalents thereof. 
     EXEMPLIFICATION 
     The practitioner has a well-established literature of peptide chemistry to draw upon, in combination with the information contained herein, for guidance on synthetic strategies, protecting groups, and other materials and methods useful for the synthesis of the compounds of this invention. 
     The various references cited herein provide helpful background information on preparing compounds similar to the inventive compounds described herein or relevant intermediates, as well as information on formulation, uses, and administration of such compounds which may be of interest. 
     Moreover, the practitioner is directed to the specific guidance and examples provided in this document relating to various exemplary compounds and intermediates thereof. For example, synthetic guidance may be found in  J. Org. Chem.,  2001, 66:7355-7364. 
     The compounds of this invention and their preparation can be understood further by the examples that illustrate some of the processes by which these compounds are prepared or used. It will be appreciated, however, that these examples do not limit the invention. Variations of the invention, now known or further developed, are considered to fall within the scope of the present invention as described herein and as hereinafter claimed. 
     According to the present invention, any available techniques can be used to make or prepare the inventive compounds or compositions including them. For example, a variety of solution phase synthetic methods such as those discussed in detail below may be used. Alternatively or additionally, the inventive compounds may be prepared using any of a variety combinatorial techniques, parallel synthesis and/or solid phase synthetic methods known in the art. 
     It will be appreciated as described below, that a variety of inventive compounds can be synthesized according to the methods described herein. The starting materials and reagents used in preparing these compounds are either available from commercial suppliers such as Aldrich Chemical Company (Milwaukee, Wis.), Bachem (Torrance, Calif.), Sigma (St. Louis, Mo.), or are prepared by methods well known to a person of ordinary skill in the art following procedures described in such references as Fieser and Fieser 1991, “Reagents for Organic Synthesis”, vols 1-17, John Wiley and Sons, New York, N.Y., 1991; Rodd 1989 “Chemistry of Carbon Compounds”, vols. 1-5 and supps, Elsevier Science Publishers, 1989; “Organic Reactions”, vols 1-40, John Wiley and Sons, New York, N.Y., 1991; March 2001, “Advanced Organic Chemistry”, 5th ed. John Wiley and Sons, New York, N.Y.; and Larock 1990, “Comprehensive Organic Transformations: A Guide to Functional Group Preparations”, 2 nd  ed. VCH Publishers. These schemes are merely illustrative of some methods by which the compounds of this invention can be synthesized, and various modifications to these schemes can be made and will be suggested to a person of ordinary skill in the art having regard to this disclosure. 
     The starting materials, intermediates, and compounds of this invention may be isolated and purified using conventional techniques, including filtration, distillation, crystallization, chromatography, and the like. They may be characterized using conventional methods, including physical constants and spectral data. 
     Certain exemplary compounds of the invention are listed below and are referred to by compound number as indicated. 
     
       
         
           
               
               
             
               
                   
               
               
                 Compound 
                 Structure 
               
               
                   
               
             
            
               
                 ER-803840 (HEMIASTERLIN) 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-803887 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-803888 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-803889 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-803890 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-803921 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-803995 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-803996 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-803997 Higher Rf diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-803998 Lower Rf diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-803999 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-804000 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-804001 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-804002 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-804332 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-804333 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-804334 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-804635 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-804636 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-804762 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805206 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805230 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805231 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805257 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805258 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805268 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805316 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805324 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805532 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805590 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805594 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805599 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805697 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805701 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805711 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805713 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805734 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805735 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805736 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805738 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805847 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805865 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805876 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805913 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805914 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805925 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805938 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805968 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-805974 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806004 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806005 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806021 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806022 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806023 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806031 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806032 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806073 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806085 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806086 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806105 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806110 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806119 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806135 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806147 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806180 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806223 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806318 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806356 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806371 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806395 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806396 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806397 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806398 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806399 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806400 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806409 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806418 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806713 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806717 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806718 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806735 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806748 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806749 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806791 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806792 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806793 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806794 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806822 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806823 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806824 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806825 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806830 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806831 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806853 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806854 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806861 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806862 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806863 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806864 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806865 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806866 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806867 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806868 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806869 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806870 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806871 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806879 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806880 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806881 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806882 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806920 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806921 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806922 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806923 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806924 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-806925 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807000 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807001 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807002 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807077 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807078 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807079 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807080 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807081 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807096 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807101 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807102 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807133 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807134 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807135 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807145 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807146 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807147 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807148 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807160 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807161 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807180 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807192 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807193 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807194 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807195 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807209 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807210 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807212 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807213 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807214 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807215 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807217 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807218 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807219 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807222 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807226 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807228 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807229 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807230 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807231 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807232 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807237 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807238 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807246 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807247 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807248 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807249 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807303 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807324 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807328 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807329 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807332 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807334 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807339 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807341 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807342 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807343 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807344 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807345 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807346 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807347 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807352 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807353 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807354 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807355 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807360 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807361 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                      R-807362 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807364 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807365 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807366 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807370 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807371 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807374 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807375 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807393 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807413 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807414 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807417 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807418 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807419 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807420 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807421 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807431 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807461 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807470 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807471 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807480 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807481 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807482 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807483 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807484 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807487 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807494 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807495 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807499 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807500 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807501 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807502 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807503 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
             
               
                   
               
             
            
               
                 ER-807504 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807529 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807530 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807533 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807534 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807535 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807540 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807541 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807542 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807575 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807576 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807577 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807602 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807603 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807619 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807620 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807621 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807622 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807625 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807626 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807739 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807740 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807742 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807743 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807744 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807745 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807760 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807761 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807796 Trans-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807797 Trans-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807798 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807799 Mixture of two diastereomers 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807800 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807801 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807802 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807803 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807804 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807805 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807806 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807807 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807808 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807809 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807810 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807811 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807812 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807820 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807821 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807829 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807830 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807831 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807832 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807833 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807839 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807840 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807842 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807844 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807846 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807850 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807860 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807861 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807863 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer. 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807864 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer. 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807874 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807875 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807877 Cis-substituents on the piperidine ring. Two diatereomers (4:1). 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807880 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807881 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807882 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807883 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807884 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807885 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807886 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807888 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807889 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807890 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807891 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807899 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807900 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807902 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807904 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807905 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807906 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807907 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807908 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807909 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807911 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807944 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807945 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807947 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807948 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807949 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807950 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807951 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807953 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807954 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807959 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer. 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807960 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer. 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807961 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807963 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807973 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807974 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807975 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807981 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807982 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807983 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807986 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807987 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807988 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807989 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807990 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807991 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807992 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807994 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807995 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807996 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807997 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807998 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-807999 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808000 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808001 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808002 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808007 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808008 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808010 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808011 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808012 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808013 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808029 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808030 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808031 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808032 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808033 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808034 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808035 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808037 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808038 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808057 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808058 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808059 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808060 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808061 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808062 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808063 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808065 Trans-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer. 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808066 Trans-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer. 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808067 Trans-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer. 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808068 Trans-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer. 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808071 Trans-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer. 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808072 Trans-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer. 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808073 Trans-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer. 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808074 Trans-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer. 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808075 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808076 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808077 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808108 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808109 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808110 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808111 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808112 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808113 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808114 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808115 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808116 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808117 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808118 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808119 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808120 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808121 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808122 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808123 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808124 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808125 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808126 Absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808131 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808139 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808140 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808141 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808142 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808143 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808144 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808145 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808146 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808147 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808148 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808149 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808150 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808161 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808166 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808167 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808168 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808169 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808170 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808171 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808172 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808173 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808174 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808175 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808176 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808177 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808178 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808179 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808180 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808181 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808182 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808183 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808189 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808190 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808191 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808192 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808193 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808194 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808195 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808196 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808197 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
             
               
                   
               
             
            
               
                 ER-808198 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808199 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808200 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808201 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808202 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808203 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808204 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808205 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808206 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808207 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808208 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808209 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808210 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808211 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808212 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808213 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808214 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808215 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808216 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808217 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808218 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808219 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808220 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808221 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808222 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808223 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808224 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808225 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808226 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808248 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808249 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808251 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808253 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808292 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808293 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808294 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808295 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808296 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808297 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808298 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808299 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808300 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808301- 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808302 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808303 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808304 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808305 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808306 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808307 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808308 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808309 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808323 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808324 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808325 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808326 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808328 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808329 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808330 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808331 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808332 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808333 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808334 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808335 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808336 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808337 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808338 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808339 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808340 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808341 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808342 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808343 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808344 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808345 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808357 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808358 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808359 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808366 single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808367 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808368 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808383 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808384 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808389 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808390 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808391 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808392 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808393 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808394 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808395 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808396 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808397 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808398 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808399 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808400 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808401 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808402 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808403 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808404 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808433 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808434 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808435 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808436 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808437 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808447 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808448 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808449 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808450 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808451 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808452 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808453 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808454 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808475 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808476 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808477 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808478 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808479 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808480 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808481 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808482 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808483 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808484 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808485 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808486 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808487 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808488 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808489 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808490 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808491 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808492 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808493 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808494 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808495 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808552 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808553 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808563 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808564 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808565 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808566 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808567 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808568 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808609 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808610 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808656 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808662 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808674 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808676 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808677 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808678 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808679 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808680 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808681 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808682 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808683 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808684 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808685 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808686 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808687 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808688 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808689 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808690 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808693 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808694 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808695 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808696 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808697 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808698 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808699 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808700 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808706 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808707 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808708 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-80870 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808710 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808731 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808732 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808774 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808775 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808777 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808779 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808780 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808815 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808816 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808817 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808818 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808819 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808820 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808821 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808822 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808823 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808824 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808825 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808826 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808827 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808828 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808829 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808830 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808831 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808832 Cis-substituents on the piperidine ring, but absolute stereochemistry is unknown. Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808861 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808862 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808863 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808864 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808865 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808866 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808867 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808868 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808869 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808870 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808871 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808872 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808873 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808874 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808875 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808876 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808877 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808878 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808879 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808880 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808881 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808882 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808883 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808884 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808885 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808886 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808887 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808888 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808889 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808890 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808891 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808892 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808893 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808894 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808895 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808896 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808897 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808898 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808899 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
             
               
                   
               
             
            
               
                 ER-808900 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808901 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808902 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808903 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808904 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808905 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808906 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808907 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808908 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808909 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808910 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808911 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808912 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808913 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808914 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808915 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808916 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808917 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808918 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808919 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808920 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808921 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808922 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808923 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808987 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808988 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-808990 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809040 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809041 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809043 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809044 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809045 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809046 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809054 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809055 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809056 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809057 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809058 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809059 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809060 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809061 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809062 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809063 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809064 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809065 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809066 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809067 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809068 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809069 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809070 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809071 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809072 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809073 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809074 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809075 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809076 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809077 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809078 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809079 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809080 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809081 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809082 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809083 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809084 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809085 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809086 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809087 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809088 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809089 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809090 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809091 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809092 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809093 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809094 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809095 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809096 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809097 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809098 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809099 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809100 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809101 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809102 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809103 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809104 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809105 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809106 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809107 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809108 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809109 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809110 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809111 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809112 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809113 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809114 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809115 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809116 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809117 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809118 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809119 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809120 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809121 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809122 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809123 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809124 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809125 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809126 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809127 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809128 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809129 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809130 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809131 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809132 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809133 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809134 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809135 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809136 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809137 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809138 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809139 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809140 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809141 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809142 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809143 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809144 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809145 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809146 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809147 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809148 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809149 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809150 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809151 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809152 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809153 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809154 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809155 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809156 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809157 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809158 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809159 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809160 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809161 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809162 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809163 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809164 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809165 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809166 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809167 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809240 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809241 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809242 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809243 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809244 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809245 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809246 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809247 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809268 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809269 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809282 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809283 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809284 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809285 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809300 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809301 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809302 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809303 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809304 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809305 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809306 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809308 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809309 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809310 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809311 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809312 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809313 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809314 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809315 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809316 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809317 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809318 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809319 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809320 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809321 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809322 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809323 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809324 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809325 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809326 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809638 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809640 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809641 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809642 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809643 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809644 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809645 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809646 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809647 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809648 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809649 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                 ER-809650 Single diastereomer 
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
               
                   
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
               
                   
               
            
           
         
       
     
     General Reaction Procedures: 
     Unless mentioned specifically, reaction mixtures were stirred using a magnetically driven stirrer bar. An inert atmosphere refers to either dry argon or dry nitrogen. Reactions were monitored either by thin layer chromatography (TLC), by proton nuclear magnetic resonance or by high-pressure liquid chromatography (HPLC), of a suitably worked up sample of the reaction mixture. 
     Listed below are abbreviations used for some common organic reagents referred to herein:
         BOC or BOC 2 O: Di-tert-Butyl dicarbonate   CMC: 1-Cyclohexyl-3-(2-morpholinoethyl)carbodiimide metho-p-toluenesulfonate   DCM: Dichloromethane   DEPC: Diethylphosphoryl cyanide (Diethyl cyanophosphonate)   DIBAL: Diisobutylaluminum hydride   DIEA: Diisopropylethylamine   DMF: N,N-Dimethylformamide   DMSO: Dimethylsulfoxide   Ether: Diethyl ether   HBTU: O-(1-H-benzotriazol-1-yl)-N,N,N,N-tetramethyluronium hexafluorophosphate   HOAt: 1-Hydroxy-7-azabenzotriazole   LAH: Lithium aluminum hydride   MSA: Methane sulfonic acid   NMM: N-Methyl Morpholine   TBME: Tert-butyl methyl ether   TFA: Trifluoroacetic acid   THF: Tetrahydrofuran   TMEDA: Tetramethylethylenediamine       

     General Work Up Procedures: 
     Unless mentioned specifically, reaction mixtures were cooled to room temperature or below then quenched, when necessary, with either water or a saturated aqueous solution of ammonium chloride. Desired products were extracted by partitioning between water and a suitable water-immiscible solvent (eg. ethyl acetate, dichloromethane, diethyl ether). The desired product containing extracts were washed appropriately with water followed by a saturated solution of brine. On occasions where the product containing extract was deemed to contain residual oxidants, the extract was washed with a 10% solution of sodium thiosulphate in saturated aqueous sodium bicarbonate solution, prior to the aforementioned washing procedure. On occasions where the product containing extract was deemed to contain residual acids, the extract was washed with saturated aqueous sodium bicarbonate solution, prior to the aforementioned washing procedure (except in those cases where the desired product itself had acidic character). On occasions where the product containing extract was deemed to contain residual bases, the extract was washed with 10% aqueous citric acid solution, prior to the aforementioned washing procedure (except in those cases where the desired product itself had basic character). Post washing, the desired product containing extracts were dried over anhydrous magnesium sulphate, then filtered. The crude products were then isolated by removal of solvent(s) by rotary evaporation under reduced pressure, at an appropriate temperature (generally less than 45° C.). 
     On occasions where triphenylphosphine oxide was a major byproduct of the reaction, the reaction mixture was added directly to a large volume of well-stirred hexane. The resultant precipitate of triphenylphosphine oxide was removed by filtration and the filtrate processed in the usual manner. 
     General Purification Procedures: 
     Chromatographic purification refers either to flash column chromatography on silica, using a single solvent or mixed solvent as eluent, or HPLC on a C18 column. Suitably purified desired product containing elutes were combined and concentrated under reduced pressure at an appropriate temperature (generally less than 45° C.) to constant mass. Final compounds were prepared for biological testing by either a) dissolved in 50% aqueous acetonitrile, filtered and transferred to vials, then freeze-dried under high vacuum; or b) dissolved in methanol, filtered and transferred to vials, then concentrated to dryness using a Centrifugal vacuum evaporator. 
     EXAMPLE 1 
     Preparation of Amine Esters 18, Amine Acids 20 and Amine Amides 23 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 13 
     
       
         
         
             
             
         
       
     
     To a solution of Compound 12 (205 mg) in DMF (3.8 ml), at room temperature, was added (S)-N-Boc-neo-phenylalanine (6) (140 mg), NMM (0.30 ml), HOAt (0.124 g), and CMC (1.16 g). The reaction mixture was shaken at room temperature for 24 hr. Aqueous workup followed by chromatographic purification gave Compound 13 (153 mg, 61%). 
     Preparation of Compound 14 
     
       
         
         
             
             
         
       
     
     To a solution of compound 13 (153 mg) in methanol (20 ml), at 0° C., was added sodium borohydride (3.18 g) portionwise with shaking over a 3 day period. The reaction mixture temperature was maintained between 0°-5° C. On occasion where the reaction mixture turned into a solidified mass, THF was added to aid agitation. The reaction mixture was allowed to warm to room temperature then re-cooled to 0° C. and worked up in the usual manner to give compound 14 (140 mg, 96%). 
     Preparation of Compound 15 
     
       
         
         
             
             
         
       
     
     To a solution of compound 14 (50 mg) in THF (3 ml), at room temperature, was added Dess Martin periodinane (204 mg) in one portion. The resultant suspension was stirred vigorously for 4.5 hr. An aqueous work up gave crude compound 15 (50 mg) which was used immediately in the next stage without purification. 
     General Procedure for the Preparation of Amine Esters 18 
     
       
         
         
             
             
         
       
     
     To a solution of compound 15 (1 equivalent) in a suitable volume of 1,2-dichloroethane, at room temperature, was added 4A molecular sieves (crushed and dried) (equal mass to that of the amine hydrochloride). A suitably chosen amine hydrochloride (16) (10 equivalents) was added with vigorous stirring followed by sodium triacetoxyborohydride (1.5 equivalents). The reaction mixture was stirred at an appropriate temperature (20°-50° C.) until compound 15 was consumed to a satisfactory degree. Aqueous work up followed by chromatographic purification gave the corresponding N-Boc Amine Ester 17. Deprotection of the N-Boc moiety under suitable conditions would give the corresponding N-terminal free amine 18. 
     General Procedure for the Preparation of Amine Acids 20 
     
       
         
         
             
             
         
       
     
     To a solution of the N-Boc Amine Ester 17 in a suitable mixture of THF and methanol, was added 1M lithium hydroxide solution (10-50 equivalents). When the N-Boc Amine Ester 17 was hydrolyzed to a satisfactory degree, the reaction mixture was given an aqueous work up. The N-Boc Amine Acid 19 was purified chromatographically. Deprotection of the N-Boc moiety under suitable conditions would give the corresponding N-terminal free amine 20. 
     General Procedure for the Preparation of Amine Amides 23 
     
       
         
         
             
             
         
       
     
     To a solution of the N-Boc Amine Acid 19 in DMF, at room temperature, was added NMM (20 equivalents). A suitably chosen amine hydrochloride (21) (20 equivalents) was added followed by DEPC (20 equivalents). When the N-Boc Amine Acid 19 was consumed to a satisfactory degree the N-Boc Amine Amide 22 was isolated either by direct chromatographic purification of the reaction mixture, or by an aqueous work up followed by chromatographic purification. Deprotection of the N-Boc moiety under suitable conditions would give the corresponding N-terminal free amine 23. 
     EXAMPLE 2 
     Preparation of N-Acetyl Amine Amides 27 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 24 
     
       
         
         
             
             
         
       
     
     To a solution of aldehyde 13 (50 mg) in 1,2-dichloroethane (2 ml), at room temperature, was added 4A molecular sieves (crushed and dried) (50 mg). Glycine methyl ester hydrochloride (120 mg) was added with vigorous stirring followed by sodium triacetoxyborohydride (205 mg). The reaction mixture was stirred at 40° C.) for two hours. Aqueous work up followed by chromatographic purification gave compound 24 (31 mg, 46%). 
     Preparation of Compound 25 
     
       
         
         
             
             
         
       
     
     To a solution of compound 24 (5.5 mg) in DMF (0.4 ml), at room temperature, was added pyridine (0.006 ml) followed by acetic anhydride (0.004 ml). The reaction mixture was shaken for three hours at room temperature then concentrated in vacuo to dryness. The residue was dissolved in saturated HCl in methanol (1 ml) and stood at room temperature for 15 minutes. The reaction mixture was concentrated in vacuo to give compound 25 (4 mg, 90%). 
     Preparation of Compound 26 
     
       
         
         
             
             
         
       
     
     To a solution of compound 25 (3.35 mg) in methanol (0.2 mL), was added 1 M lithium hydroxide solution (0.118 mL). The reaction mixture was stirred at room temperature for 5 hr. Chromatographic purification followed by treatment with methanolic HCl gave the hydrochloride salt of compound 26 (1.95 mg, 61%). 
     General Procedure for the Preparation of N-Acetyl Amine Amides 27 
     
       
         
         
             
             
         
       
     
     To a solution of compound 26 (1 equivalent) in DMF, at room temperature, was added NMM (20 equivalents). A suitably chosen amine hydrochloride (21) (20 equivalents) was added followed by DEPC (20 equivalents). When compound 26 was consumed to a satisfactory degree the N-Acetyl Amine Amide (27) was isolated by direct chromatographic purification of the reaction mixture. 
     EXAMPLE 3 
     Preparation of Compound 33 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 28 
     
       
         
         
             
             
         
       
     
     To a solution of compound 3b (1.94 g) in dry DCM (20 mL), at 0° C. under an inert atmosphere, was added a 1 M solution of DIBAL (32 mL) dropwise. The reaction mixture was stirred at 0° C. for 2.5 hr then methanol (4.4 mL) was added dropwise followed by a saturated solution of ammonium chloride (8.8 mL). DCM (200 mL) was added and the reaction mixture stirred vigorously at room temperature for 30 min. Filtration followed by concentrated in vacuo gave crude compound 28 (1.08 g, 65%). 
     Preparation of Compound 29 
     
       
         
         
             
             
         
       
     
     To a solution of compound 28 (207 mg) in THF (5 mL), at 0° C. under an inert atmosphere, was added sodium hydride (60% dispersion in mineral oil; 160 mg) portionwise. The reaction mixture was stirred at 0° C. for 45 min then treated with ethyl bromoacetate (0.47 mL). The reaction mixture was allowed to warm to room temperature. An aqueous work up followed by chromatographic purification gave an intermediate Boc compound (185 mg, 67%). The intermediate Boc compound (139 mg) was dissolved in ethanol (2 mL) and treated with saturated HCl in ethanol (2 mL). The reaction mixture was stood at room temperature for 10 min then concentrated in vacuo to dryness to give compound 29 (114 mg). 
     Preparation of Compound 30 
     
       
         
         
             
             
         
       
     
     To a solution of compound 29 (114 mg) in DMF (1.8 mL), at room temperature, was added (S)-N-Boc-tert-leucine (4) (283 mg), NMM (0.135 mL), HOAt (56 mg), and CMC (518 mg). The reaction mixture was shaken at room temperature for 16 hr. Aqueous workup followed by chromatographic purification gave an intermediate Boc compound (42 mg, 22%). The intermediate Boc compound (42 mg) was dissolved in saturated HCl in ethanol (5 mL) and stood at room temperature for 10 min. Concentration in vacuo gave compound 30 (37 mg). 
     Preparation of Compound 31 
     
       
         
         
             
             
         
       
     
     To a solution of compound 30 (24 mg) in DMF (0.26 mL), at room temperature, was added (S)-N-Boc-neo-phenylalanine (6) (38 mg), NMM (0.014 mL), HOAt (8.3 mg), and CMC (52 mg). The reaction mixture was shaken at room temperature for 16 hr. Aqueous workup followed by chromatographic purification gave an intermediate Boc compound (38 mg, 64%). The intermediate Boc compound (38 mg) was dissolved in saturated HCl in ethanol (5 mL) and stood at room temperature for 10 min. Concentration in vacuo gave compound 31 as its HCl salt. 
     Preparation of Compound 32 
     
       
         
         
             
             
         
       
     
     A solution of compound 31 (4 mg) in ethanol (2 mL) was treated with 1 M lithium hydroxide (0.5 ml). The reaction mixture was stirred at room temperature for 1.5 hr. Aqueous work up followed by chromatographic purification gave compound 32 (2.9 mg, 76%). 
     Preparation of Compound 33 
     
       
         
         
             
             
         
       
     
     To a solution of compound 32 (1.9 mg) in DMF (70 μl), at room temperature, was added NMM (3.8 μl), pyrrolidine (2.8 μl), and DEPC (5.2 μl). The reaction mixture was stirred at room temperature for 16 hr. The reaction mixture was purified chromatographically to give compound 33 (1.2 mg, 58%). 
     EXAMPLE 4 
     Preparation of Amine Esters 42, Amine Acids 43 and Amine Amides 45 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 39 
     
       
         
         
             
             
         
       
     
     To a solution of compound 12 (1.25 g) in DMF (21 mL), at room temperature, was added (R)-N-methylpipecoline hydrochloride (38) (0.38 g), NMM (1.4 mL), HOAt (0.575 g), and CMC (5.37 g). The reaction mixture was shaken at room temperature for 24 hr. Aqueous workup gave compound 39 (0.511 g, 63%). 
     Preparation of Compound 40 
     
       
         
         
             
             
         
       
     
     To a solution of compound 39 (0.8 g) in methanol (8 mL), at 0° C., was added sodium borohydride (7.9 g) portionwise over a 3 day period. The reaction mixture temperature was maintained between 0°-5° C. On occasion where the reaction mixture turned into a solidified mass, THF was added to aid stirring. The reaction mixture was allowed to warm to room temperature then re-cooled to 0° C. and quenched with saturated sodium bicarbonate solution. Aqueous workup gave compound 40. 
     Preparation of Compound 41 
     
       
         
         
             
             
         
       
     
     To a solution of compound 40 (50 mg) in THF (3 mL), at room temperature, was added Dess Martin periodinane (225 mg) in one portion. The resultant suspension was stirred vigorously for 4 hr. An aqueous work up gave crude compound 41 (55 mg) which was used immediately in the next stage without purification. 
     General Procedure for the Preparation of N-terminal N-heterocyclic Amine Esters 42 
     
       
         
         
             
             
         
       
     
     To a solution of compound 41 (300 mg) in 1,2-dichloroethane (10 mL), at room temperature, was added 4 A molecular sieves (crushed and dried) (1.5 g). The amino acid ester hydrochloride (16) (10 equivalents) was added and the reaction mixture stirred vigorously for ˜10 min. Sodium triacetoxyborohydride (290 mg) was added in one portion and the reaction mixture stirred vigorously at room temperature. When compound 41 was consumed to a satisfactory degree, the reaction mixture was given an aqueous work up. The N-terminal N-heterocyclic Amine Esters 42 was purified chromatographically, except in cases where it was deemed unnecessary. 
     General Procedure for the Preparation of N-terminal N-heterocyclic Amine Acids 43 
     
       
         
         
             
             
         
       
     
     To a solution of the N-terminal N-hetercyclic Amine Esters (42) in a suitable mixture of THF and methanol, was added 1 M lithium hydroxide solution (10-50 equivalents). When the N-terminal N-heterocyclic Amine Esters 42 was hydrolyzed to a satisfactory degree, the reaction mixture was given an aqueous work up. The N-terminal N-heterocyclic Amine acid 43 was purified chromatographically, except in cases where it was deemed unnecessary. 
     General Procedure for the Preparation of N-terminal N-heterocyclic Amine Amides 45 
     
       
         
         
             
             
         
       
     
     To a solution of the N-terminal N-heterocyclic Amine acid 43 in DMF, at room temperature, was added NMM (20 equivalents). A suitably chosen amine hydrochloride (44) (20 equivalents) was added followed by DEPC (20 equivalents). When the N-terminal N-heterocyclic Amine acid 43 was consumed to a satisfactory degree the N-terminal N-heterocyclic Amine Amide 45 was isolated either by direct chromatographic purification of the reaction mixture, or by an aqueous work up followed by chromatographic purification. 
     EXAMPLE 5 
     Preparation of Compounds 51 and 52 
     
       
         
         
             
             
         
       
     
     Step 1: Preparation of Compound 49: 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 47: 
     
       
         
         
             
             
         
       
     
     Procedure a. 
     Compound 46 (1.0405 g, 4.4984 mmol) was dissolved in DMF (8.0 mL). K 2 CO 3  (0.6258 g, 4.5279 mmol) was added. Methyl iodide (0.6 mL, 9.6379 mmol) was added. The milky suspension was stirred at room temp under nitrogen for 3 days. Standard aqueous workup yielded ester 47 as a colorless oil (1.0590 g, 96%). 
     Preparation of Compound 2: 
     
       
         
         
             
             
         
       
     
     Compound 47 (0.9447 g, 3.8509 mmol) was dissolved in toluene (15 mL), and the solution was cooled to −78° C. under nitrogen. DIBAL (6.0 mL, 6.00 mmol, 1.0 M in hexanes) was added via syringe over 5 min. The solution was stirred for 1 h, and was quenched with MeOH (1.0 mL) at −78° C. The bath was removed and 5.0 mL of saturated potassium sodium tartrate solution was added. The mixture was stirred for ca. 1 h, and was filtered through Celite. The filtrate was washed with H 2 O and brine, and dried over Na 2 SO 4 , filtered, and evaporated to give compound 2 (0.8413 g, 101%) sufficiently pure for the next step. 
     Preparation of Compound 3b: 
     
       
         
         
             
             
         
       
     
     Compound 2 (0.8413 g, 3.8509 mmol) was dissolved in CH 2 Cl 2  (5.0 mL) and (carbethoxyethylidene)triphenylphosphorane (1.8212 g, 5.0254 mmol) was added. The solution was stirred at room temp under nitrogen overnight. The solution was evaporated, and the residue was diluted with EtOAc (70 mL) and washed with H 2 O (2×25 mL) and brine (25 mL), and dried over Na 2 SO 4 , filtered, and evaporated to give an oil. Purification by Flash Chromatography on SiO 2  (FC) gave pure compound 3b (0.7863 g, 68%). 
     Preparation of Compound 48: 
     
       
         
         
             
             
         
       
     
     Compound 3b (0.7863 g, 2.6262 mmol) was dissolved in CH 2 Cl 2  (1.0 mL) and triethylsilane (0.460 mL, 2.880 mmol) was added. Trifluoroacetic acid (TFA) (2.5 mL) was added at room temp. After 30 min (complete reaction as judged by HPLC), the solution was evaporated to give a solid (1.1307 g). This solid was dissolved in CH 3 CN (ca. 10 mL) and 5.5 N HCl (2.4 mL, 13.2 mmol) was added. Evaporation gave the HCl salt, compound 48 (0.618 g, 100%). 
     Preparation of Compound 5b: 
     
       
         
         
             
             
         
       
     
     Compound 48 (0.390 g, 1.6543 mmol),  L -N-BOC-t-butylglycine (1.0106 g, 4.3694 mmol), CMC (1.9704 g, 4.6518 mmol), HOAt (0.5905 g, 4.3384 mmol), and NMM (0.490 mL, 4.4567 mmol) were combined, and DMF (4.0 mL) was added. The solution was stirred at room temp under nitrogen for 25 h. The solution was diluted with EtOAc (70 mL) and was washed with H 2 O (2×25 mL), aq. pH 7.2 phosphate buffer (25 mL), H 2 O (25 mL), and brine (25 mL), and dried over MgSO 4 , filtered, and evaporated to give a solid which was purified by FC to give compound 5b (0.4239 g, 62%). 
     Preparation of Compound 49: 
     
       
         
         
             
             
         
       
     
     Compound 5b (0.1159 g, 0.2809 mmol) was dissolved in CH 2 Cl 2  (3.0 mL) and triethylsilane (0.050 mL, 0.3130 mmol) was added. Trifluoroacetic acid (TFA) (2.5 mL) was added at room temp. After 30 min (complete reaction as judged by HPLC), the solution was evaporated to give a solid. This solid was dissolved in CH 3 CN (ca. 5 mL) and 5.5 N HCl was added (0.3 mL, 1.65 mmol). Evaporation gave the HCl salt, compound 49 (0.0662 g, 100%). 
     Step 2: Preparation of Compound 51: 
     Preparation of Compound 50: 
     
       
         
         
             
             
         
       
     
     Compound 49 (0.0774 g, 0.2219 mmol), (R)-N-methylpipecolic (0.0705 g, 0.3925 mmol), CMC (0.1752 g, 0.4136 mmol), HOAt (0.0344 g, 0.2527 mmol), and NMM (0.063 mL, 0.5730 mmol) were combined, and DMF (2.0 mL) was added. The solution was stirred at room temp under nitrogen for 20 h. The solution was purified directly by RP HPLC to give compound 50 (0.0989 g, 81%). 
     Preparation of Compound 51: 
     
       
         
         
             
             
         
       
     
     Compound 50 (0.0989 g, 0.2086 mmol) was dissolved in 1:1 H 2 O/MeOH (14 mL) at room temp. LiOH (0.0537 g, 2.2422 mmol) was added. The suspension was stirred at room temp. 19 h. The solution was acidified with 5.5 N HCl (0.50 mL), and purified by RP HPLC to give the TFA salt of 11 (0.0978 g, 90%). This was dissolved in CH3CN (ca. 5 mL) and treated with 5.5 N HCl (ca. 1 mL, 5.5 mmol) and evaporated to give the HCl salt of compound 51 (0.0667 g, 72%). 
     Step 2: Preparation of Compound 52: 
     
       
         
         
             
             
         
       
     
     Compound 51 (0.0062 g, 0.0139 mmol), L-proline methyl ester hydrochloride (0.0263 g, 0.1588 mmol) were dissolved in DMF (1.0 mL) at room temp. under nitrogen. DEPC (0.017 mL, 0.1120 mmol) was added via syringe. NMM (0.025 mL, 0.2274 mmol) was added via syringe. The solution was stirred overnight, quenched with H 2 O (1.0 mL), and purified by RP HPLC to give the TFA salt of compound 52. This was dissolved in CH 3 CN (ca. 3 mL) and treated with 5.5 N HCl (0.10 mL, 0.55 mmol) and evaporated to give the HCl salt of compound 52 (0.0078 g, 100%). 
     EXAMPLE 6 
     Preparation of Compound 62a 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 54 
     
       
         
         
             
             
         
       
     
     To a solution of 4-methylpiperidine (53) (600 μL, 5.0 mmol) in MeOH (20 mL) was added Et 3 N (770 μL, 5.5 mmol) followed by Boc 2 O (1.2 g, 5.5 mmol) at 0° C. After 15 minutes, the reaction mixture was warmed to room temperature and allowed to stir overnight. The reaction solution was then diluted with H 2 O and extracted several times with ether. The ether extracts were combined, dried over Mg 2 SO 4 , filtered, and concentrated to provide compound 54 (926.5 mg) quantitatively as a colorless oil. 
     Preparation of Compound 55 
     
       
         
         
             
             
         
       
     
     A solution of compound 54 (926.5 mg, 5.0 mmol) in Et 2 O (10.5 mL) was cooled to −78° C. and treated with TMEDA (755 μL, 5.0 mmol) followed by slow addition of a 1.3 M cyclohexane solution of sec-butyllithium (4.6 mL, 6.0 mmol) over a 30 minute period. The reaction solution was then warmed to −20° C. and maintained at that temperature for 30 minutes, after which the solution was re-cooled to −78° C. and purged with gaseous carbon dioxide for 15 minutes. The reaction solution was then slowly warmed to 0° C. and poured into a biphasic mixture of 1 N HCl (100 mL) and EtOAc (50 mL). The reaction solution was then extracted several times with EtOAc. The EtOAc extracts were combined, dried over Mg 2 SO 4 , filtered, and concentrated to provide compound 55 (1.07 g) in 89% yield as a colorless oil (a mixture of two cis enantiomers). 
     Preparation of Compound 59a 
     
       
         
         
             
             
         
       
     
     To a solution of compound 55 (292 mg, 1.2 mmol) in CH 2 Cl 2  (2.4 mL) at 0° C. was added TFA (2.4 mL). After 15 minutes, the reaction solution was warmed to r.t. and stirred for 3 hours. The reaction mixture was then concentrated in vacuo to provide compound 59a (309 mg) quantitatively as a light yellow oil. 
     Preparation of Compound 59b 
     
       
         
         
             
             
         
       
     
     Step 1: Preparation of Compound 56 
     
       
         
         
             
             
         
       
     
     To a solution of compound 55 (780 mg, 3.2 mmol) in DMF (6.4 mL) was added K 2 CO 3  (663 mg, 4.8 mmol) followed by MeI (300 μL, 4.8 mmol). The reaction solution was allowed to stir overnight. The reaction mixture was then diluted with H 2 O and extracted several times with ether. The ether extracts were combined, dried over Mg 2 SO 4 , filtered, and concentrated in vacuo. Purification of the residue by silica gel chromatography (4% EtOAc in hexanes) yielded 535 mg (65%) of compound 56 as a colorless oil. 
     Step 2: Preparation of Compound 57 
     
       
         
         
             
             
         
       
     
     To a solution of compound 56 (463 mg, 1.8 mmol) in MeOH (2.6 mL) was added a 25 wt % solution of NaOMe in MeOH (100 μL). The solution was allowed to stir overnight. The reaction mixture was then diluted with H 2 O and extracted several times with ether. The ether extracts were combined, dried over Mg 2 SO 4 , filtered, and concentrated in vacuo. Purification of the residue by silica gel chromatography (4% EtOAc in hexanes) yielded 363.6 mg (79%) of racemic compound 57 as a colorless oil. 
     Step 3: Preparation of Compound 58 
     
       
         
         
             
             
         
       
     
     To a solution of compound 57 (360 mg, 1.4 mmol) in a 2:1 mixture of H 2 O (2.75 mL) and EtOH (5.50 mL) was added KOH pellets (786 mg, 14 mmol) and the reaction solution was stirred at room temperature until complete by TLC. The reaction mixture was then diluted with H 2 O and extracted several times with ether. The ether extracts were combined, dried over Mg 2 SO 4 , filtered, and concentrated to provide compound 58 (341 mg) quantitatively as a white solid. 
     Step 4: Preparation of Compound 59b 
     To a solution of compound 58 (292 mg, 1.2 mmol) in CH 2 Cl 2  (2.4 mL) at 0° C. was added TFA (2.4 mL). After 15 minutes, the reaction solution was warmed to r.t. and stirred for 3 hours. The reaction mixture was then concentrated in vacuo to provide compound 59b (309 mg) quantitatively as a light yellow oil. 
     Preparation of Compounds 60a and 60b 
     
       
         
         
             
             
         
       
     
     To a solution of compound 59a (or 59b) (283 mg, 1.1 mmol) in MeOH (5 mL) was added Pd(OH) 2  (75 mg) followed by a 37 wt % solution of formaldehyde in H 2 O (300 μL). Gaseous H 2  (balloon pressure) was charged in and the reaction mixture was allowed to stir under an H 2  atmosphere overnight. The reaction solution was then filtered through a bed of celite, and concentrated to provide compound 60a (or 60b) (173 mg) quantitatively as a white solid. 
     Preparation of Compounds 61a and 61b 
     
       
         
         
             
             
         
       
     
     To a solution of compound 60a and 60b (11.0 mg, 0.07 mmol) in CH 2 Cl 2  (350 μL) was added HBTU (40 mg, 0.11 mmol) and DIEA (37 μL, 0.21 mmol). After 5 minutes, amine 49 (22.0 mg, 0.07 mmol) was added. The reaction mixture was stirred for 30 minutes, filtered, and concentrated. Purification of the residue by silica gel chromatography (2% EtOH in CH 2 Cl 2 ) yielded 15.1 mg (96%) of each diastereomer 61a and 61b as colorless oils. 
     Preparation of Compound 62a 
     
       
         
         
             
             
         
       
     
     To a solution of diastereomer 61a (9.0 mg, 0.02 mmol) in a 2:1 mixture of H 2 O (80 μL) and EtOH (160 μL) was added LiOH.H 2 O (840 mg, 0.20 mmols). The reaction solution was allowed to stir overnight. The reaction mixture was then acidified with 1 N HCl until the pH=6.00. The solution was then extracted several times with CH 2 Cl 2 . The CH 2 Cl 2  extracts were combined, dried over Mg 2 SO 4 , filtered, and concentrated to provide compound 62a (8.4 mg) quantitatively as a white solid. 
     EXAMPLE 7 
     Preparation of Compound 67b 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 64 
     
       
         
         
             
             
         
       
     
     To a suspension of L-penicillamine (63) (300 mg, 2.0 mmol) in methanol (10 mL) was added benzaldehyde (233 mg, 2.2 mmol) followed by sodium bicarbonate (336 mg, 4.0 mmol). The mixture was heated to reflux with stirring for 16 h. After cooling to r.t., it was acidified to pH 5 with 1 N HCl and extracted with ethyl acetate three times. The organic phase was concentrated to give a yellow solid as the crude product 64 (469 mg, 99%) 
     Preparation of Compound 65 
     
       
         
         
             
             
         
       
     
     To a solution of crude 64 (47 mg, 0.2 mmol) in THF (1 mL) was added aq. 37% formaldehyde solution (49 μl, 0.6 mmol) followed by NaBH 4  (38 mg, 0.6 mmol). The mixture was stirred at r.t. for 24 h. After acidifying to pH 5 and extracting with ethyl acetate, the organic phase was dried and concentrated to give crude product 65 (67 mg, &gt;100%). 
     Preparation of Compounds 66a and 66b 
     
       
         
         
             
             
         
       
     
     To a mixture of 65 (29 mg, 0.115 mmol), amine HCl salt 49 (15 mg, 0.043 mmol), CMC (55 mg, 0.129 mmol), and HOAt (3 mg, 0.022 mmol) was added DMF (0.5 mL) followed by NMM (6 ml, 0.055 mmol). The mixture was stirred at r.t. for 24 h. The reaction was quenched by adding water (0.5 mL) and methanol (0.5 mL). The products 66a (32%), and 66b (75%) were obtained after separation by RP HPLC (0-100% B in 30 min. A: 5% MeCN+0.15% TFA in H 2 O; B: 0.150% TFA in MeCN) and lyophilization. 
     Preparation of Compounds 67b 
     
       
         
         
             
             
         
       
     
     To a solution of 66b (4 mg, 0.0073 mmol) in methanol (0.5 mL) was added aq. LiOH (1 M, 0.5 mL). The mixture was stirred for 16 h and acidified with 1 N HCl. Product 67b (2.79 mg, 74%) was obtained after RP HPLC purification and lyophilization. 
     EXAMPLE 8 
     Preparation of Compound 74 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 69 
     
       
         
         
             
             
         
       
     
     To a solution of diethylglycine (68) (131 mg, 1.0 mmol) in 1 N NaOH (1.5 mL) was added a solution of di-t-butyl-dicarbonate (436 mg, 2.0 mmol) in dioxane (1.0 mL). The mixture was stirred for 16 h. It was acidified to pH 3 with 1 N HCl and extracted with ethyl acetate three times. The organic phases were combined, dried, and concentrated to yield crude product 69 (135 mg, 58%). 
     Preparation of Compound 70 
     
       
         
         
             
             
         
       
     
     To a solution of crude 69 (135 mg, 0.58 mmol) in MeOH (0.5 mL) and THF (0.5 mL) was added trimethylsilyldiazomethane (2 M in hexanes, 2.0 mmol). The solution was stirred at r.t. for 1 h. Evaporation gave crude product 70 (0.58 mmol). 
     Preparation of Compound 71 
     
       
         
         
             
             
         
       
     
     To a mixture of sodium hydride (160 mg 60%, 4 mmol) in DMF (1 mL) was added a solution of compound 70 (0.58 mmol) in DMF (1 mL) followed by methyl iodide (188 μl, 3 mmol). The mixture was stirred at room temperature for 24 h. Water was added to quench the reaction. The product 71 (118 mg, 78% 2 steps) was extracted with ethyl acetate and purified by flash column chromatography (silica, ethyl acetate/hexanes). 
     Preparation of Compound 72 
     
       
         
         
             
             
         
       
     
     A solution of compound 71 (118 mg, 0.46 mmol) in conc. HCl (1 mL) was stirred at room temp. for 24 h. Product 72 was obtained after evaporation of volatiles. 
     Preparation of Compound 73 
     
       
         
         
             
             
         
       
     
     To a mixture of compound 72 (30 mg, 0.166 mmol), amine 49 HCl salt (39 mg, 0.166 mmol), CMC (141 mg, 0.332 mmol), and HOAt (14 mg, 0.103 mmol) was added DMF (1.5 mL) followed by NMM (6 ml, 0.128 mmol). The mixture was stirred at room temp. for 24 h. The reaction was quenched by adding water (0.5 mL) and methanol (0.5 mL). Product 73 (27 mg, 34%) was obtained after separation by RP HPLC (0-100% B in 30 min. A: 5% MeCN+0.15% TFA in H 2 O; B: 0.15% TFA in MeCN) and lyophilization. 
     Preparation of Compound 74 
     
       
         
         
             
             
         
       
     
     To a solution of compound 73 (18 mg) in methanol (0.5 mL) was added aq. LiOH (1 M, 0.5 mL). The mixture was stirred for 16 h and then acidified by 1 N HCl. Product 74 (12.3 mg, 73%) was obtained after RP HPLC purification and lyophilization. 
     EXAMPLE 9 
     Preparation of Compound 78 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 76 
     
       
         
         
             
             
         
       
     
     To a solution of compound 75 (123 mg) in dry DCM (1 mL), at 0° C. under an inert atmosphere, was added a 1 M solution of DIBAL (1.6 mL) dropwise. The reaction mixture was stirred at 0° C. for 2 hr then allowed to warm to 10° C. then re-cooled to 0° C. Methanol (0.22 mL) was added dropwise followed by a saturated solution of ammonium chloride (0.44 mL). DCM (20 mL) was added and the reaction mixture stirred vigorously at room temperature for 30 min. Filtration followed by concentrated in vacuo gave compound 76 (73 mg, 65%). 
     Preparation of Compound 77 
     
       
         
         
             
             
         
       
     
     To a solution of compound 76 (3 mg) in acetonitrile (0.6 mL) was added Dess Martin periodinane (3.1 mg). The reaction mixture was stirred at room temperature for 1 hr then diluted with diethyl ether (2 mL). The resultant suspension was filtered through a 0.25 μm PTFE syringe filter and concentrated in vacuo to give crude compound 77 (4 mg). 
     Preparation of Compound 78 
     
       
         
         
             
             
         
       
     
     To a solution of compound 77 (3 mg) in DCM (0.5 mL), at room temperature, was added ethyl carbethoxymethylidene triphenylphosphorane (21 mg). The reaction mixture was stirred at room temperature for 16 hr then concentrated in vacuo to dryness. Chromatographic purification gave compound 78 (1.48 mg, 44%). 
     EXAMPLE 10 
     Preparation of Compound 81 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 79 
     
       
         
         
             
             
         
       
     
     To a solution of compound 7b (10 mg) in dry DCM (0.5 mL), at 0° C. under an inert atmosphere, was added a 1 M solution of DIBAL (0.085 mL) dropwise. The reaction mixture was stirred at 0° C. for 1.5 hr then methanol (0.012 mL) was added dropwise followed by a saturated solution of ammonium chloride (0.024 mL). DCM (5 mL) was added and the reaction mixture stirred vigorously at room temperature for 20 min. Filtration followed by concentrated in vacuo gave crude compound 79 (9 mg, 95%). 
     Preparation of Compound 80 
     
       
         
         
             
             
         
       
     
     To a solution of compound 79 (5 mg) in THF (0.5 mL) was added sodium bicarbonate (3.6 mg) and Dess Martin periodinane (7.2 mg). The reaction mixture was stirred at room temperature for 3 hr then concentrated in vacuo to give crude compound 80. 
     Preparation of Compound 81 
     
       
         
         
             
             
         
       
     
     To a solution of compound 80 (4.8 mg) in ethanol (0.5 mL), at room temperature, was added hydroxylamine hydrochloride (4 mg) and sodium acetate (6 mg). The reaction mixture was stirred at 40° C. for 1.5 hr then concentrated to dryness. The residue was dissolved in DCM (0.2 mL) and treated with TFA (0.2 mL) and stood at room temperature for 10 min. Concentration in vacuo to dryness followed by chromatographic purification gave compound 81 (2.04 mg). 
     EXAMPLE 11 
     Preparation of Compound 87 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 84 
     
       
         
         
             
             
         
       
     
     To a solution of compound 28 (335 mg) in THF (10 mL), at 0° C. under an inert atmosphere, was added sodium hydride (65% dispersion in mineral oil; 144 mg) portionwise. The reaction mixture was stirred at 0° C. for 30 min then treated with methyl iodide (0.405 mL). The reaction mixture was allowed to warm to room temperature and stirred at room temperature for 3 hr. An aqueous work up followed by chromatographic purification gave compound 84 (254 mg, 72%). 
     Preparation of Compound 85 
     
       
         
         
             
             
         
       
     
     Compound 84 (189 mg) was treated with saturated HCl in methanol (5 mL). The reaction mixture was stood at room temperature for 2 hr then concentrated in vacuo to dryness to give compound 85 (145 mg). 
     Preparation of Compound 86 
     
       
         
         
             
             
         
       
     
     To a solution of compound 85 (145 mg) in DMF (3 mL), at room temperature, was added (S)-N-Boc-tert-leucine (483 mg), NMM (0.230 mL), HOAt (95 mg), and CMC (884 mg). The reaction mixture was shaken at room temperature for 16 hr. Aqueous workup followed by chromatographic purification gave an intermediate Boc compound (249 mg, 93%). The intermediate Boc compound (60 mg) was dissolved in methanol (1 mL) and treated with saturated HCl in methanol (3 mL) and stood at room temperature for 30 min. Concentration in vacuo gave compound 86 (49 mg). 
     Preparation of Compound 87 
     
       
         
         
             
             
         
       
     
     To a solution of compound 86 (49 mg) in DMF (0.44 mL), at room temperature, was added (S)-N-Boc-neo-phenylalanine (94 mg), NMM (34 μl), HOAt (21 mg), and CMC (130 mg). The reaction mixture was shaken at room temperature for 16 hr. Aqueous workup followed by chromatographic purification gave an intermediate Boc compound (41 mg, 47%). The intermediate Boc compound (5.5 mg) was dissolved in DCM (1 mL) and treated with TFA (1 mL). The reaction mixture was stood at room temperature for 30 min then concentrated in vacuo to dryness. The residue was dissolved in saturated HCl in methanol (1 mL) and stood at room temperature and then concentrated in vacuo to give compound 87 (4.39 mg, 89%). 
     EXAMPLE 12 
     Preparation of Compound 91 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 88 
     
       
         
         
             
             
         
       
     
     To a solution of compound 28 (344 mg) in 0.5 M Hunnig&#39;s base in DCM (8 mL), at 0° C. under an inert atmosphere, was added methane sulphonyl chloride (0.207 mL) dropwise. The reaction mixture was stirred at 0° C. for 1.5 hr then subjected to an aqueous work up followed by chromatographic purification to give an intermediate mesylate (444 mg). The intermediate mesylate was dissolved in DMSO (2 mL) and treated with sodium azide (258 mg). The reaction mixture was heated at 40° C. for 6 hr. An aqueous work up gave compound 88 (306 mg, 82%). 
     Preparation of Compound 89 
     
       
         
         
             
             
         
       
     
     Compound 88 (140 mg) was dissolved in DCM (1 mL) and treated with TFA (1 mL). The reaction mixture was stood at room temperature for 30 min then concentrated in vacuo to dryness. The residue was dissolved in saturated HCl in methanol (1 mL) and stood at room temperature and then concentrated in vacuo to give compound 89 (109 mg). 
     Preparation of Compound 90 
     
       
         
         
             
             
         
       
     
     To a solution of compound 89 (109 mg) in DMF (2 mL), at room temperature, was added (S)-N-Boc-tert-leucine (347 mg), NMM (0.165 mL), HOAt (68 mg), and CMC (635 mg). The reaction mixture was stirred at room temperature for 16 hr. Aqueous workup followed by chromatographic purification gave an intermediate Boc compound (173 mg, 87%). The intermediate Boc compound (51 mg) was dissolved in methanol (1 mL) and treated with saturated HCl in methanol (3 mL) and stood at room temperature for 30 min. Concentration in vacuo gave compound 90 (43 mg). 
     Preparation of Compound 91 
     
       
         
         
             
             
         
       
     
     To a solution of compound 90 (42 mg) in DMF (0.37 mL), at room temperature, was added (S)-N-Boc-neo-phenylalanine (79 mg), NMM (28 μl), HOAt (17 mg), and CMC (108 mg). The reaction mixture was shaken at room temperature for 16 hr. Aqueous workup followed by chromatographic purification gave an intermediate Boc compound (88 mg). The intermediate Boc compound (88 mg) was dissolved in saturated HCl in methanol (5 mL) and stood at room temperature for 30 min and then concentrated in vacuo to give compound 91 (70 mg, 89%). 
     EXAMPLE 13 
     General Procedure for the Preparation of C-Terminal Acid Compounds 
     
       
         
         
             
             
         
       
         
         
           
             R 2 =Me or Et 
             R 1 =see examples below 
           
         
       
    
     
       
         
         
             
             
         
       
       
         
         
             
             
         
       
     
     To a solution of the corresponding methyl or ethyl ester (e.g., compound 7b) in a suitable mixture of methanol and tetrahydrofuran, at room temperature, was added aqueous 1 M lithium hydroxide (10-50 equivalents). The reaction mixture was stirred or shaken or stood at room temperature until the starting ester had been satisfactorily hydrolyzed. The usual workup followed by chromatographic purification gave the desired C-terminal acid compound (e.g., compound 82). 
     EXAMPLE 14 
     Preparation of Compound ER-807974 
     
       
         
         
             
             
         
       
     
     Preparation of Compound ER-807641 
     
       
         
         
             
             
         
       
     
     To a stirred solution of N-Boc-N-Me-L-Valine (200 g, 0.86 mols), N,O-demethylhydroxylamine (92.8 g, 0.95 mols, 1.1 eq) and DIEA (316.3 mL, 1.82 mol, 2.1 eq) in CH 3 CN (2 L) at 0° C. was added HBTU (360.7 g, 0.95 mols, 1.1 eq) in portions. The solution was stirred at 0° C. for additional 15 min and then for 1 h at 25° C. Reaction was monitored by TLC (Hept./EtOAc 1:1) and deemed completed when no 46 was observed. The solution was concentrated by rota-vap and then diluted in TBME (1 L). The organic solution was washed with HCl (1N, 500 mL), water (250 mL), NaHCO 3  (sat. 250 mL) and brine (250 mL). The organic solution was dried over MgSO 4  (˜120 g). The solution was filtered through a silica gel bed (˜200 g) and concentrated. Crude amide ER-807641 was used without any further purification. 
     Preparation of Compound ER-808993 
     
       
         
         
             
             
         
       
     
     To a stirred solution of amide ER-807641 (207 g, 755 mmol, 1 eq.) in dry THF (2070 mL) at −78° C. was added a solution of LiAlH 4  (1.0M/THF, 754 mL, 755 mmol, 1.0 eq.). The solution was stirred at −78° C. for 1 h. Reaction was quenched at −78° C. by addition of reaction solution to a suspension of Na 2 SO 4 .10H 2 O (243 g) in TBME (1.5 L). The slurry was allowed to warm up to ˜15° C. and was then filtered through a Celite pad. The filtrate was concentrated, and the crude aldehyde ER-808993 was obtained as a clear oil and used without further purification.: 157.9 g (97%). 
     Preparation of Compound ER-808995-01 
     
       
         
         
             
             
         
       
     
     Part A: 
     To a stirred solution of aldehyde ER-808993 (138 g, 641 mmol, 1 eq.) in dry THF (1.4 L) at 25° C. was added Ph 3 P═CMeCO 2 Et (256 g, 705.1 mmol, 1.1 eq.). The solution was stirred at r.t for 18 h. Reaction was not completed after that time. The solution was heated to reflux for 5 h, after which TLC showed no aldehyde remaining. The solution was cooled to room temp and heptane (1.5 L) was added. Precipitation of by-product Ph 3 P═O was observed. The mixture was filtered through a silica gel (200 g) plug. The filtrate was concentrated to a minimum volume (˜50 mL), and the residue was dissolved in EtOAc (800 mL). 
     Part B: 
     To a stirred solution of crude ER-808994 in EtOAc (800 mL) was added MSA (80 mL). The mixture was stirred at r.t. for 45 min. (until complete by TLC). The amino-ester MSA salt was extracted from organic solution with water (2×300 mL). The aqueous layer was neutralized to pH 7-8 with sat. NaHCO 3  (300 mL). The resultant solution was extracted with EtOAc (2×400 mL), washed with brine (300 mL), dried over MgSO 4 , and filtered. The EtOAc solution of the free amino-ester was bubbled with HCl (gas), and the HCl salt of ER-808995 precipitated and was collected by filtration under N 2 . 
     Preparation of Compound ER-803921-01 
     
       
         
         
             
             
         
       
     
     To a stirred solution of ER-808995 (61.2 g, 259.6 mmol, 1 eq.), N-Boc-tBu-Gly-OH (90.1 g, 389.4 mmol, 1.5 eq) and DIEA (158 mL, 906.6 mmol, 3.5 eq) in dry DCM (612 mL) at 25° C. was added HBTU (147.7 g, 389.4 mmol, 1.5 eq.). The solution was stirred at room temp for 4 h After concentration, the solid residue was suspended in TBME (250 mL). The mixture was filtered through a silica gel bed (˜120 g), and the filtrate was washed with a solution of aq. HCl (1N, 200 mL), water (200 mL) and NaHCO 3  (sat, 200 mL). The organic layer was dried over MgSO 4 , filtered and concentrated. The N-Boc-amino-ester ER-808996 was isolated as an oil. This intermediate was re-dissolved in EtOAc (120 mL) and MSA (75 mL) was added. The solution was stirred at room temp for 1 h, at which time the reaction was deemed complete by TLC. The amino-ester MSA salt was extracted with water (2×250 mL), followed by neutralization with a solution NaOH (ca.50%, 300 mL) to pH˜8-9. The free amine was extracted with TBME (2×30 mL). The combined organic solution was washed with water (200 mL) and brine (200 mL). After drying over MgSO 4  and filtration, HCl (g) was bubbled to obtain the hydrochloride salt of ER-803921 as a white solid collected by filtration at ca. 5° C. 
     Preparation of Compound ER-808998 
     
       
         
         
             
             
         
       
     
     A stirred suspension of D-pipecolic acid (100.0 g, 0.77 mol, 1 eq.) and Pd(OH) 2  (20% wt. Pd, 10 g) in a mixture MeOH/acetone (2:1 v/v, 1.5 L) was submitted to hydrogenation (H 2  60 psi) for 24 h. Reaction was monitored by TLC (ethanol) and deemed complete when no D-pipecolic acid was observed. The mixture was filtered through a Celite (˜50 g) bed. The clear filtrate was concentrated to ca. 100 mL and TBME (50 mL) was added. ER-808998 was filtered as a white crystalline solid in 88% yield. 
     Preparation of Compound ER-807961 
     
       
         
         
             
             
         
       
     
     To a stirred solution of dipeptide ER-803921 (5.0 g, 16.8 mmol, 1 eq.), N-iPr-pipecolic acid ER-808998 (3.7 g, 21.8 mmols, 1.3 eq.) and HBTU (8.3 g, 21.8 mmols, 1.3 eq.) in 50 mL DCM was added DIEA (7.3 mL, 41.9 mmols, 2.5 eq.) dropwise at 25° C. The mixture was stirred for 18 h (overnight) at which time reaction was deemed complete by TLC (heptane/EtOAc 1:1). The mixture was concentrated under vacuum and TBME (50 mL) was added. The residual “thick” oil was separated from the ethereal solution by filtration through a Celite pad. The filtrate was washed with aq HCl (1M, 3×25 mL). The combined aqueous phases were neutralized with NH 4 OH to pH 8-9 in the presence of EtOAc (25 mL). The aqueous layer was separated and back-extracted with TBME (25 mL). The combined organic phase was washed with brine and dried over MgSO 4 , filtered, and concentrated to give tripeptide-amino-ester ER-807961 in 93% yield. 
     Preparation of Compound ER-807974 
     
       
         
         
             
             
         
       
     
     To a stirred solution of ester ER-807961 (5.0 g, 16.8 mmol) in 5:1 THF/H 2 O (50 mL) was added LiOH (3.50 g, 83.8 mmol), and the mixture was stirred at room temperature for 20 h. The reaction was monitored by TLC (ethanol) and deemed complete when no ER-807961 was observed. The suspension was acidified with H 2 SO 4  (˜0.50 mL) to pH 7. The mixture was extracted with EtOAc (3×25 mL). The combined organic solution was washed with brine (20 mL), dried over MgSO 4 , filtered, and concentrated. The residue was triturated with TBME: 1.8 g (83%) of thick oil free-base ER-807974 was obtained. 
     EXAMPLE 15 
     Preparation of Compound ER-808367 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 2Z 
     
       
         
         
             
             
         
       
     
     To a suspension of D-pipecolic acid 1Z (750 mg, 5.81 mmol) in MeOH (23.2 mL) and 2-butanone (11.6 mL) was added Pd(OH) 2  (175 mg). Gaseous H 2  (balloon pressure) was charged in and the reaction mixture was allowed to stir under an H 2  atmosphere overnight. The reaction solution was then filtered through a bed of celite, and concentrated to give a crude white solid. The crude product was subjected to flash chromatography (SiO 2 ) eluting with 100% EtOH. This provided compound 2Z (721 mg, white solid) as a mixture of diastereomers in 67% yield. 
     Preparation of Compounds 3Z and 4Z 
     
       
         
         
             
             
         
       
     
     To a solution of 2Z (650 mg, 3.51 mmol) in DMF (8.8 mL) was added K 2 CO 3  (728 mg 5.27 mmol) and p-nitrobenzylbromide (1.1 g, 5.27 mmol). The reaction mixture was allowed to stir overnight. The reaction solution was diluted with water and extracted several times with diethyl ether. The ether extracts were combined, washed with water and brine. The solution was dried over MgSO 4 , filtered, and concentrated in vacuo. The crude mixture of diasteomers was then separated by flash chromatography eluting with 8% EtOAc in hexanes to give each diastereomer as a pale yellow oil. Compound 3Z (360 mg) was obtained in 32% yield with an R f =0.590 (SiO 2 ) using 30% EtOAc in hexanes. Compound 4Z (652 mg) was obtained in 58% yield with an R f =0.482 (SiO 2 ) using 30% EtOAc in hexanes. 
     Preparation of Compound ER-809439 
     
       
         
         
             
             
         
       
     
     To a solution of compound 3Z (320 mg, 1.0 mmol) in MeOH (10 mL) was added Pd(OH) 2  (50 mg). Gaseous H 2  (balloon pressure) was charged in and the reaction mixture was allowed to stir under an H 2  atmosphere for 3 hours. The reaction solution was then filtered through a bed of celite, and concentrated to provide compound ER-809439 (185 mg) as a white solid, quantitatively. Compound ER-809439, R f =(SiO 2 , 0.292, 100% EtOH). 
     Preparation of Compound ER-809447 
     A procedure similar to that used for the preparation of compound ER-809439 was used. Compound ER-809447, R f =(SiO 2 , 0.292, 100% EtOH). 
     Preparation of Compound ER-808357 
     
       
         
         
             
             
         
       
     
     Compound 49 (9.6 mg, 0.031 mmol), N-sec-butylpipecolic ER-809439 (5.2 mg, 0.028 mmol), HBTU (12.9 mg, 0.034 mmol), were combined. DMF (0.28 mL) was added, followed by DIEA (14.9 mL, 0.084 mmol). The solution was stirred at room temperature under nitrogen for 20 h. The solution was purified directly by RP HPLC to give the TFA salt of compound ER-808357 (13.6 mg, 82%). 
     Preparation of Compound ER-808367 
     
       
         
         
             
             
         
       
     
     The TFA salt of compound ER-088357 (10.4 mg, 0.018 mmol) was dissolved in 1:2 H 2 O/EtOH (0.072 mL/0.144 mL) at room temperature. LiOH (7.5 g, 0.18 mmol) was added. The suspension was stirred at room temperature for 19 hours. The solution was purified directly by RP HPLC to give the TFA salt of compound ER-808367 (10.1 mg, quantitative). 
     EXAMPLE 16 
     Preparation of Compound ER-808368 
     
       
         
         
             
             
         
       
     
     Preparation of Compound ER-808358 
     
       
         
         
             
             
         
       
     
     A procedure similar to that used for the preparation of compound ER-808357 was used. 
     Preparation of Compound ER-808368 
     
       
         
         
             
             
         
       
     
     A procedure similar to that used for the preparation of compound ER-808367 was used. 
     EXAMPLE 17 
     Preparation of Compound ER-808662 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 5Z 
     
       
         
         
             
             
         
       
     
     To a suspension of D-pipecolic acid 1Z (1.00 g, 7.74 mmol) in MeOH (31 mL) and 3-methyl-2-butanone (15.5 mL) was added Et 3 N (1.1 mL) and Pd(OH) 2  (250 mg). Gaseous H 2  (balloon pressure) was charged in and the reaction mixture was allowed to stir under an H 2  atmosphere overnight. The reaction solution was then filtered through a bed of celite, and concentrated to give a crude white solid. The crude product was subjected to flash chromatography (SiO 2 ) eluting with 100% EtOH. This provided compound 5Z (377.9 mg, white solid) as a single diastereomer in 24.5% yield. R f =(SiO 2 , 0.280, 100% EtOH). 
     Preparation of Compound ER-808656 
     
       
         
         
             
             
         
       
     
     A procedure similar to that used for the preparation of compound ER-808357 was used. 
     Preparation of Compound ER-808662 
     
       
         
         
             
             
         
       
     
     A procedure similar to that used for the preparation of compound ER-808367 was used. 
     Compounds ER-809638 through ER-809650 were made according to the procedures for ER-808368 or ER-808662 with the one change: N-BOC-L-Valine was used in place of N-BOC-N-Methyl-L-Valine (46). Compounds ER-808998, ER-809439 and 5Z were used as required. 
     EXAMPLE 18 
     Preparation of Compound ER-808824 
     
       
         
         
             
             
         
       
     
     Preparation of Compound 6Z 
     
       
         
         
             
             
         
       
     
     Compound 48 (325.5 mg, 1.38 mmol), L-N-BOC-valine (300.0 mg, 1.38 mmol), HBTU (628.3 mg, 1.66 mmol), were combined. CH 2 Cl 2  (7 mL) was added, followed by DIEA (0.72 mL, 4.14 mmol). The solution was stirred at room temperature under nitrogen for 1 hour. The solution was concentrated in vacuo, and the crude was purified by flash chromatography (SiO 2 ) eluting with 4% EtOAc in hexanes. This provided compound 6Z (476.8 mg) as a colorless oil in 86.7% yield. 
     Preparation of Compound 7Z 
     
       
         
         
             
             
         
       
     
     Compound 6Z (450 mg, 1.13 mmol) was dissolved directly in 4N HCl/dioxane (2.8 mL). The reaction was stirred for overnight and then concentrated in vacuo to give compound 7Z (374.8 mg) as a white solid, quantitatively. 
     Preparation of Compound ER-808815 
     
       
         
         
             
             
         
       
     
     A procedure similar to that used for the preparation of compound ER-808357 was used. 
     Preparation of Compound ER-808824 
     
       
         
         
             
             
         
       
     
     A procedure similar to that used for the preparation of compound ER-808367 was used. 
     EXAMPLE 19 
     Biological Assays 
     In certain embodiments, compounds of the invention were tested for in vitro and in vivo activity. Screening methods included standard in vitro cell growth inhibition assays using a panel of human cancer cell lines, a U937 (ATCC accession number CRL 1593) mitotic block reversibility assay, mouse serum stability assay, MDR assay, and cytotoxicity assay. In certain other emdodiments, compounds of the invention were evaluated in tumor xenograft in vivo growth inhibition assays. 
     In vitro potency was determined in the MDA-MB-435 cell growth inhibition assay, and active compounds (IC 50 &lt;20 nM) were evaluated in the reversibility, MDR, and mouse serum stability assays. In addition, the active compounds were tested in the IMR-90 cytotoxicity assay and in additional cell growth inhibition assays in a panel of human cancer cell lines, both solid and non-solid tumors. 
     Cell growth inhibition assay: Cultured human cancer cells (including breast, prostate, colon, lung, leukemia, lymphoma and other) were plated in 96-well plates and grown in the continuous presence of test compounds for 72 or 96 hours. The human cell lines used in this cell growth inhibition assay, include, but are not limited to, the following solid tumor cell lines and non-solid tumor cell lines: DLD-1 colon cancer cells (ATCC accession number CCL-221), DU 145 prostate cancer cells (ATCC accession number HTB-81), H460 non small cell lung cancer, HCT-15 colon cancer cells (ATCC accession number CCL-225), HEL erythroleukemia cells, HL-60 promyelocytic leukemia cells (ATCC accession number CCL-240), K562 leukemia (ATCC accession number CCL-243), LOX melanoma, MDA-MB-435 breast cancer cells, U937 lymphoma cells (ATCC accession number CRL 1593), PANC-1 pancreatic cancer (ATCC accession number CRL-1469), HCC-2998 colon cancer (NCI-Frederick Cancer DCTD Tumor/Cell Line Repository), HCT 116 colon cancer (ATCC accession number CCL-247), HT-29 colon cancer (ATCC accession number HTB-38), LoVo colon cancer (ATCC accession number CCL-229), SW-480 colon cancer (ATCC accession number CCL-228), SW-620 colon cancer (ATCC accession number CCL-227) and COLO-205 colon cancer (ATCC accession number CCL-222). For monolayer cultures, growth was assessed using modifications (Amin et al, Cancer Res., 47: 6040-6045, 1987) of a methylene blue-based microculture assay (Finlay et al, Anal. Biochem., 139: 272-277, 1984). Absorbances at 620 and 405 nm were measured on a Titertek Multiscan MCC/340 plate reader and absorbances at 405 nm were subtracted from absorbances at 620 nm. For suspension cultures, growth was assessed using a 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide-based assay (Mosmann et al, J. Immunol. Methods, 65: 55-63, 1983) modified as follows. After 4 days of incubation with test compounds, sterile-filtered 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide was added to each well (final concentration, 0.5 mg/ml), and plates were incubated at 37° C. for 4 h. Acid-isopropanol (0.1 N HCl in isopropanol, 150 mL) was then added to each well, and the resultant formazan crystals were dis-solved by gentle mixing. Absorbances at 540 nm were measured on a Titertek Multiscan MCC/340 plate reader. 
     Mitotic block reversibility assay was performed as described (See, patent U.S. Pat. No. 6,214,865 B1, by B. Littelfield et al, Apr. 10, 2001; which is incorporated herein be reference in its entirety). 
     Briefly, U937 (ATCC accession number CRP 1593) were exposed to various concentration of compounds for 12 hours. The compounds were washed away and the cells were allowed to recover for an additional 10 hours. The cells were collected by centrifugation and fixed overnight in 70% ethanol. The cells were washed in PBS, incubated with RNase A and stained with propidium iodide. Single channel flow cytometry was performed on a Becton Dickinson FACScan; the collection and analysis of data were performed using Becton Dickinson CELLQuest software. Doublet events were eliminated from analyses by proper gating on FL2-W/FL2-A primary plots before histogram analysis of DNA content (measured as FL2-A). 
     Determination of activity in vitro utilizing the MDR assay. This is a modification of the standard cell growth inhibition assays described above. Two cultured himan cancer cell lines were used: human uterine sarcoma MDR negative MES-SA cells (ATCC accession number CRL-1976) and human uterine sarcoma MDR-positive MES-SA/D×5 cells (ATCC accession number CRL-1977). Cells were plated in a 96-well microtiter plates at a density of 7500 cells/well. The cells were incubated in the presence or absence of test compounds for 96 hours. Cell growth was assessed using modifications (Amin et al, Cancer Res., 47: 6040-6045, 1987) of a methylene blue-based microculture assay (Finlay et al, Anal. Biochem., 139: 272-277, 1984). Absorbances at 620 and 405 nm were measured on a Titertek Multiscan MCC/340 plate reader and absorbances at 405 nm were subtracted from absorbances at 620 nm. The ratio of the concentrations of the compounds inhibiting the growth of cells by 50% was calculated and used to estimate the sensitivity of the compounds to MDR (multidrug-resistance, or P-glycoprotein-mediated drug efflux). In some cases, a different pair of cell lines was used: MDR-negative murine leukemia cells P388/S, and MDR-positive murine leukemia cells P388NMDRC.04. Cells were plated in a 96-well microtiter plates at a density of 4000 cells/well. The cells were incubated in the presence or absence of test compounds for 72 hours. Cell growth was assessed using a 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide-based assay (Mosmann et al, J. Immunol. Methods, 65: 55-63, 1983) modified as follows. After 3 days of incubation with test compounds, sterile-filtered 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide was added to each well (final concentration, 0.5 mg/ml), and plates were incubated at 37° C. for 4 h. Acid-isopropanol (0.1 N HCl in isopropanol, 150 mL) was then added to each well, and the resultant formazan crystals were dis-solved by gentle mixing. Absorbances at 540 nm were measured on a Titertek Multiscan MCC/340 plate reader. 
     Stability to esterase degradation was determined in the mouse serum stability assays. The enzymatic activity of mouse serum can result in inactivation of compounds in vivo despite their promising in vitro activity. A modification of the standard cell growth inhibition assays described above was used to determine stability of the test compounds to esterase degradation. Human breast carcinoma cell line MDA-MB-435 or human prostate carcinoma cell line DU 145 were used. The cells were plated in a 96-well microtiter plates at a density of 7500 cells/well. Prior to adding the test compounds to cells in the cell growth inhibition assay, the test compounds were incubated in 100% mouse serum or normal growth medium for 6 hours at 37° C. After that, the test compounds were added to the 96-well microtiter plates containing the cells. The cells were incubated in the presence or absence of test compounds for 96 hours. Cell growth was assessed using modifications (Amin et al, Cancer Res., 47: 6040-6045, 1987) of a methylene blue-based microculture assay (Finlay et al, Anal. Biochem., 139: 272-277, 1984). Absorbances at 620 and 405 nm were measured on a Titertek Multiscan MCC/340. Ability of test compounds to inhibit cell growth after compounds&#39; exposure to mouse serum esterases was assessed. 
     Cytotoxicity assay. To determine toxicity of compounds against normal, non-dividing cells, quiescent IMR-90 normal human fibroblasts (ATCC accession number CCL-186) were used. IMR-90 cells were plated in a 96-well microtiter plate format and grown to confluency (for 72 hours). After the 72-hour growth, the cells were washed and the medium was replaced from normal medium containing 10% fetal bovine serum to medium containing low concentration of serum (0.1%). Cells were made quiescent by incubation in 0.1% serum-containing growth medium for additional 72 hours. Cells were incubated with the test compounds for 24 hours. Cellular ATP levels were measured using a ViaLight HS kit (LumiTech Ltd). A cytotoxic compound carbonyl cyanide was used in all assays as a positive control for cytotoxicity. 
     Determination of antitumor activity in vivo in mice. In vivo tumor xenograft studies were performed in immunocompromised (nude) mice. Mice (female Ncr athymic) were implanted subcutaneously with human tumor xenografts (including breast MDA-MB-435, colon COLO-205, HCT-15, HCT-116, HCC-2998, HT-29, SW-620, DLD-1, LoVo, melanoma LOX, lung H522, pancreatic PANC-1). After the xenografts reached an average size of 75-200 mm 3  or 400-600 mm 3 , the animals were weighed and randomly divided into groups of 8-10 on the first day of compound administration. Test compounds were administered intravenously or intraperitoneally. Tumor and body weight measurements were done twice weekly.