# Patent

## Title
Protease inhibitors

## Abstract

The present invention provides HIV protease inhibitors of formulas I, IA, IB, Ib or II, or pharmaceutically acceptable salts thereof, wherein R2 may be, for example, 2-pyridyl-CH2—, 3 -pyridyl-CH2—, 4-pyridyl-CH2—, a sulfonyl group as described in the formulas herein including benzenesulfonyl or thiophenesulfonyl groups, R2a—CO—, R2a being selected from the group consisting of piperonyl, 2-pyrazinyl (unsubstituted or substituted with H, or an alkyl of 1 to 4 carbon atoms) or a picolylamine group as described herein, wherein R3 may be, for example, a phenyl group or diphenylmethyl group as described herein, and wherein Cx may be, for example, COOH, CONR5R6, CH2OH or CH2OR7.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a U.S. National Stage Application of International Patent Application No. PCT/IB2007/004453, filed Sep. 20, 2007, which claims the benefit of the filing date of U.S. Provisional Application No. 60/846,084, filed Sep. 21, 2006, each of which is hereby incorporated by reference.
This application claims priority to U.S. Provisional Application No. 60/846,084, filed Sep. 21, 2006, the entire contents of which are herein incorporated by reference.


BACKGROUND OF THE INVENTION
Inhibitors of the HIV viral protease are presently considered the most effective drugs against HIV infection. Unfortunately, most current proteases inhibitors are relatively large hydrophobic molecules that possess rather low bioavailability. A high pill burden is therefore required to attain the therapeutic dose in a patient. This is a deterrent, which too often results in patient non-compliance and inadequate treatment results. This situation leads to sub-optimal therapeutic drug concentration that in turns leads to the development of HIV resistant strains. Consequently, there is an urgent need to improve the solubility and bioavailability of proteases inhibitors.
A unique class of amino acid based HIV protease inhibitors have been described in international application No. PCT/CA02/00190 published under No. WO02/064551 on Aug. 22, 2002 the entire content of which is incorporated herein by reference.
Aromatic derivatives have also been described in U.S. Pat. No. 6,632,816 to Stranix et al, the entire content of which is incorporated herein by reference. This patent includes, more particularly, N,-synthetic amino acid substituted L-lysine derivatives possessing potent aspartyl protease inhibitory properties. However, it would be advantageous to improve these derivatives by enhancing aqueous solubility and bioavailability in order to reduce the pill burden and to favour patient's compliance. Since it is challenging to generate active protease inhibitors, specifically toward wild-type and resistant strains, the formation of derivatives of original HIV protease inhibitors such as inhibitors described in U.S. Pat. No. 6,632,816 to Stranix et al, known to be active toward resistant strains represents a viable route with considerable advantages. More particularly, generation of compounds with enhanced aqueous solubility, bioavailability, time of duration and formulation properties along with other advantages is desirable in the development of an effective drug.
Compounds with improved solubility and bioavailability have been described in U.S. application Ser. No. 10/902,935 published under No. 2006-0025592A1 on Feb. 2, 2006 in the name of to Stranix et al. These compounds were found to be suitable for oral administration in aqueous solution.
SUMMARY OF THE INVENTION
The present invention provides new compounds which may be used to inhibit HIV protease.
More particularly, the present invention relates in a first aspect thereof to a compound of formula I




and pharmaceutically acceptable salt thereof,
where Cx may be selected, for example, from the group consisting of CH2OH, COOM′, CONR5R6, CH2OR7 where R7 may be selected from the group consisting of (HO)2P(O) and (MO)2P(O), where M′ may be H or an alkali metal or alkaline earth metal, where M may be an alkali metal or alkaline earth metal and a group of formula R7A—CO—,
where R7A may be selected, for example, from the group consisting of a straight or branched alkyl group of 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, an alkyloxy group of 1 to 6 carbon atom, —CH2OH, CH3O2C—, CH3O2CCH2—, Acetyl-OCH2CH2—, HO2CCH2—, 2-hydroxyphenyl, 3-hydroxyphenyl, 4-hydroxyphenyl, (CH3)2NCH2—, (CH3)2CHCH(NH2)—, HOCH2CH2NH—, CH3OCH2O—, CH3OCH2CH2O—, 2-pyrrolyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 1-methyl-1,4-dihydro-3-pyridyl, 2-pyrazinyl, 2-quinolyl, 3-quinolyl, 4-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 2-quinoxalinyl, a phenyl group of formula




a picolyl group selected from the group consisting of




a picolyloxy group selected from the group consisting of




a substituted pyridyl group selected from the group consisting of




and a group of formula,




where X and Y, the same or different, may be selected, for example, from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, F, Cl, Br, I, —CF3, —OCF3, —CN, —NO2, —NR5R6, —NHCOR5, —OR5, —SR5, —COOR5, —COR5, and —CH2OH or X and Y together define an ethyleneoxy group of formula —OCH2CH2—, or —CH2CH2O—, or an alkylenedioxy group selected from the group consisting of a methylenedioxy group of formula —OCH2O—, and an ethylenedioxy group of formula —OCH2CH2O—,
where R1 may be selected, for example, from the group consisting of a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, 2-pyridyl-CH2—, 3-pyridyl-CH2—, and 4-pyridyl-CH2—,
where R2 may be selected, for example, from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, 2-pyridyl-CH2—, 3-pyridyl-CH2—, 4-pyridyl-CH2—, a benzenesulfonyl group of formula




a thiophenesulfonyl group of formula




a group selected from the group of




a group of formula




a group selected from the group of formula




and a group of formula R2A—CO—, where R2A may be selected from the group consisting of a straight or branched alkyl group of 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, an alkyloxy group of 1 to 6 carbon atoms, tetrahydro-3-furanyloxy, —CH2OH, —CF3, —CH2CF3, —CH2CH2CF3, piperonyl, pyrrolidinyl, piperidinyl, 4-morpholinyl, CH3O2C—, CH3O2CCH2—, Acetyl-OCH2CH2—, HO2CCH2—, 3-hydroxyphenyl, 4-hydroxyphenyl, 4-CH3OC6H4CH2—, CH3NH—, (CH3)2N—, (CH3CH2)2N—, (CH3CH2CH2)2N—, HOCH2CH2NH—, CH3OCH2O—, CH3OCH2CH2O—, C6H5CH2O—, 2-pyrrolyl, 2-pyridyl (unsubstituted or substituted), 3-pyridyl(unsubstituted or substituted), 4-pyridyl-(unsubstituted or substituted), 2-pyrazinyl (unsubstituted or substituted with H, alkyl of 1 to 4 carbon atoms), 2-quinolyl, 3-quinolyl, 4-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 2-quinoxalinyl,
a phenyl group of formula




a picolyl group selected from the group consisting of




a picolylamine group selected from the group




a picolyloxy group selected from the group consisting of




a substituted pyridyl group selected from the group consisting of




a group selected from the group consisting of




where X′ and Y′, the same or different, may be selected, for example, from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, F, Cl, Br, I, —CF3, —NO2, —NR5R6, —NHCOR5, —OR5, —SR5, —COOR5, —COR5, —OCF3, —CN and —CH2OH,
wherein R4 may be selected, for example, from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, and a cycloalkyl group of 3 to 6 carbon atoms,
where R5 and R6, the same or different, may be selected, for example, from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, and a cycloalkyl group of 3 to 6 carbon atoms,
where R3 may be selected, for example, from the group consisting of a cyclohexyl group of formula




a phenyl group of formula




a diphenylmethyl group of formula IV




a naphthyl-1-CH2— group of formula V




a naphthyl-2-CH2— group of formula VI




a biphenylmethyl group of formula VII




and an anthryl-9-CH2— group of formula VIII




In accordance with the present invention, R2 may be selected, for example, from the group consisting of 2-pyridyl-CH2—, 3-pyridyl-CH2—, 4-pyridyl-CH2—, a benzenesulfonyl group of formula




a thiophenesulfonyl group of formula




a group selected from the group of




a group of formula




a group selected from the group of formula




and a group of formula R2A—CO—, where R2A may be selected from the group consisting of piperonyl, 2-pyrazinyl (unsubstituted or substituted with H, or an alkyl of 1 to 4 carbon atoms)
and a group selected from the group of




where X′, Y′, R5, R6 may be as defined herein.
In accordance with an exemplary embodiment of the present invention Cx may be COOH.
In accordance with an additional embodiment the present invention Cx may be CONR5R6.
In accordance with a further embodiment of the present invention, Cx may be CH2OH.
In accordance with yet a further exemplary embodiment of the present invention, Cx may be CH2OR7.
In accordance with an exemplary embodiment of the present invention, R3 may be a cyclohexyl group as described herein.
In accordance with an additional embodiment the present invention R3 may be a diphenylmethyl group as described herein.
In accordance with a further embodiment of the present invention, R3 may be a naphthyl-CH2 group as described herein.
In accordance with yet a further embodiment of the present invention, R3 may be a phenyl group as described herein.
In accordance with the present invention R3 may be a phenyl group of formula




where X′ or Y′ may be as defined herein and where at least one of X′ or Y′ is, for example, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms.
Also in accordance with the present invention R3 may be a phenyl group of formula




Cx may be CH2OR7 and where R7 may be selected, for example, from the group consisting of (HO)2P(O) and (MO)2P(O), wherein M may be an alkali metal or alkaline earth metal and a group of formula.
Also in accordance with the present invention R3 may be (C6H5)2CH—, 1-naphtyl-CH2— or 2-naphthyl-CH2—.
In an additional aspect, the present invention relates to a compound of formula IA




and pharmaceutically acceptable salt thereof,
where Cx may be selected, for example from the group consisting of CH2OH, COOM′, CONH2, CONR5R6, CH2OR7 where R7 may be selected, for example, from the group consisting of (HO)2P(O) and (MO)2P(O), where M′ may be H or an alkali metal or alkaline earth metal, wherein M may be an alkali metal or alkaline earth metal and a group of formula R7A—CO—, where R7A may be, selected from the group consisting of a straight or branched alkyl group of 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, an alkyloxy group of 1 to 6 carbon atom, —CH2OH, CH3O2C—, CH3O2CCH2—, Acetyl-OCH2CH2—, HO2CCH2—, 2-hydroxyphenyl, 3-hydroxyphenyl, 4-hydroxyphenyl, (CH3)2NCH2—, (CH3)2CHCH(NH2)—, HOCH2CH2NH—, CH3OCH2O—, CH3OCH2CH2O—, 2-pyrrolyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 1-methyl-1,4-dihydro-3-pyridyl, 2-pyrazinyl, 2-quinolyl, 3-quinolyl, 4-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 2-quinoxalinyl, a phenyl group of formula




a picolyl group selected from the group consisting of




a picolyloxy group selected from the group consisting of




a substituted pyridyl group selected from the group consisting of




and a group of formula,




where X and Y, the same or different, may be selected, for example, from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, F, Cl, Br, I, —CF3, —OCF3, —CN, —NO2, —NR5R6, —NHCOR5, —OR5, —SR5, —COOR5, —COR5, and —CH2OH or X and Y together define an ehyleneoxy group of formula —OCH2CH2— or —CH2CH2O—, or an alkylenedioxy group selected from the group consisting of a methylenedioxy group of formula —OCH2O— and an ethylenedioxy group of formula —OCH2CH2O—,
where R1 may be selected from the group consisting of a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, 2-pyridyl-CH2—, 3-pyridyl-CH2— and 4-pyridyl-CH2—,
where R2 may be selected, for example, from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, 2-pyridyl-CH2—, 3-pyridyl-CH2—, 4-pyridyl-CH2—, a benzenesulfonyl group of formula




a thiophenesulfonyl group of formula




a group selected from the group of




a group of formula




and a group of formula R2A—CO—, R2A may be selected from the group consisting of a straight or branched alkyl group of 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, an alkyloxy group of 1 to 6 carbon atoms, tetrahydro-3-furanyloxy, —CH2OH, —CF3, —CH2CF3, —CH2CH2CF3, piperonyl, pyrrolidinyl, piperidinyl, 4-morpholinyl, CH3O2C—, CH3O2CCH2—, Acetyl-OCH2CH2—, HO2CCH2—, 3-hydroxyphenyl, 4-hydroxyphenyl, 4-CH3OC6H4CH2—, CH3NH—, (CH3)2N—, (CH3CH2)2N—, (CH3CH2CH2)2N—, HOCH2CH2NH—, CH3OCH2O—, CH3OCH2CH2O—, C6H5CH2O—, 2-pyrrolyl, 2-pyridyl-(unsubstituted or substituted), 3-pyridyl-(unsubstituted or substituted), 4-pyridyl-(unsubstituted or substituted), 2-pyrazinyl (unsubstituted or substituted with H, or an alkyl of 1 to 4 carbon atoms), 2-quinolyl, 3-quinolyl, 4-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 2-quinoxalinyl,

a phenyl group of formula




a picolyl group selected from the group consisting of




a picolylamine group selected from the group




a picolyloxy group selected from the group consisting of




a substituted pyridyl group selected from the group consisting of




a group selected from the group consisting of




where X′ and Y′, the same or different, may be selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, F, Cl, Br, I, —CF3, —NO2, —NR5R6, —NHCOR5, —OR5, —SR5, —COOR5, —COR5, —CN, —OCF3 and —CH2OH,
where R4 may be selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, and a cycloalkyl group of 3 to 6 carbon atoms,
where R5 and R6, the same or different, may be selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, and a cycloalkyl group of 3 to 6 carbon atoms,
In accordance with an embodiment of the invention, Cx may be selected from the group consisting of COOH, and CONR5R6.
In accordance with the present invention, R2 may be selected from the group consisting of 2-pyridyl-CH2—, 3-pyridyl-CH2—, 4-pyridyl-CH2—,
a benzenesulfonyl group of formula




a thiophenesulfonyl group of formula




a group selected from the group of




a group of formula




a group selected from the group of formula




and a group of formula R2A—CO—, where R2A may be selected from the group consisting of piperonyl, NR5R6(CH2)m—O—, 2-pyrazinyl (unsubstituted or substituted with H, or an alkyl of 1 to 4 carbon atoms), and a group selected from the group




In a particular embodiment of the present invention, R2 may be selected, for example, from the group consisting of a benzenesulfonyl group of formula




a thiophenesulfonyl group of formula




a group selected from the group of




a group of formula




and a group selected from the group of formula




In a further aspect the present invention relates to a compound of formula IB




and pharmaceutically acceptable salt thereof,
where Cx may be selected, for example, from the group consisting of CH2OH, COOM′, CONH2, CONR2R6, CH2OR7 where R7 may be selected from the group consisting of (HO)2P(O) and (MO)2P(O), where M′ may be H or an alkali metal or alkaline earth metal, where M may be an alkali metal or alkaline earth metal and a group of formula R7A—CO—, where R7A may be selected, for example, from the group consisting of a straight or branched alkyl group of 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, an alkyloxy group of 1 to 6 carbon atom, —CH2OH, CH3O2C—, CH3O2CCH2—, Acetyl-OCH2CH2—, HO2CCH2—, 2-hydroxyphenyl, 3-hydroxyphenyl, 4-hydroxyphenyl, (CH3)2NCH2—, (CH3)2CHCH(NH2)—, HOCH2CH2NH—, CH3OCH2O—, CH3OCH2CH2O—, 2-pyrrolyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 1-methyl-1,4-dihydro-3-pyridyl, 2-pyrazinyl, 2-quinolyl, 3-quinolyl, 4-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 2-quinoxalinyl, a phenyl group of formula




a picolyl group selected from the group consisting of




a picolyloxy group selected from the group consisting of




a substituted pyridyl group selected from the group consisting of




and a group of formula,




where X and Y, the same or different, may be selected, for example, from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, F, Cl, Br, I, —CF3, —OCF3, —CN, —NO2, —NR5R6, —NHCOR5, —OR5, —SR5, —COOR5, —COR5, and —CH2OH or X and Y together define an ethylenoxy group of formula —CH2CH2O— or —CH2CH2O— or an alkylenedioxy group selected from the group consisting of a methylenedioxy group of formula —OCH2O— and an ethylenedioxy group of formula —OCH2CH2O—,
where R1 may be selected, for example, from the group consisting of a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, 2-pyridyl-CH2—, 3-pyridyl-CH2—, and 4-pyridyl-CH2—,
where R2 may be selected, for example, from the group consisting of piperonyl-CO—, 2-pyridyl-CO—, 3-pyridyl-CO—, 4-pyridyl-CO—, 2-pyrazinyl-CO— (unsubstituted or substituted with H, or an alkyl of 1 to 4 carbon atoms), a carboxyphenyl group of formula




and a pyridyl-CO— group selected from the group consisting of




where at least one of V and W may be a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms and the other of V and W being, H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, F, Cl, Br, I, —CF3, —NO2, —NR5R6, —NHCOR5, —OR5, —SR5, —COOR5, —COR5, and —CH2OH,
where X′ and Y′, the same or different, may be selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, F, Cl, Br, I, —CF3, —NO2, —NR5R6, —NHCOR5, —OR5, —SR5, —COOR5, —COR5, and —CH2OH,
where R4 may be selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, and a cycloalkyl group of 3 to 6 carbon atoms,
where R5 and R6, the same or different, may be selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, and a cycloalkyl group of 3 to 6 carbon atoms.
In yet a further aspect the present invention relates to a compound of formula Ib




and pharmaceutically acceptable salt thereof,
where R7 may be selected, for example, from the group consisting of (HO)2P(O) and (MO)2P(O), where M may be an alkali metal or alkaline earth metal and a group of formula R7A—CO—, R7A may be selected from the group consisting of an alkyloxy group of 1 to 6 carbon atom, —CH2OH, CH3O2C—, CH3O2CCH2—, Acetyl-OCH2CH2—, HO2CCH2—, 2-hydroxyphenyl, 3-hydroxyphenyl, 4-hydroxyphenyl, (CH3)2NCH2—, (CH3)2CHCH(NH2)—, HOCH2CH2NH—, CH3OCH2O—, CH3OCH2CH2O—; 2-pyrrolyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 1-methyl-1,4-dihydro-3-pyridyl, 2-pyrazinyl, 2-quinolyl, 3-quinolyl, 4-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 2-quinoxalinyl, a phenyl group of formula




a picolyl group selected from the group consisting of




a picolyloxy group selected from the group consisting of




a substituted pyridyl group selected from the group consisting of




and a group of formula,




where X and Y, the same or different, may be selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, F, Cl, Br, I, —CF3, —OCF1, —CN, —NR5R6, —NHCOR5, —OR5, —SR5, —COOR5, —COR5, and —CH2OH or X and Y together define an ethylenoxy group of formula —CH2CH2O— or —OCH2CH2— or an alkylenedioxy group selected from the group consisting of a methylenedioxy group of formula —OCH2O— and an ethylenedioxy group of formula —OCH2CH2O—,
where R1 may be selected, for example, from the group consisting of a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, 2-pyridyl-CH2—, 3-pyridyl-CH2— and 4-pyridyl-CH2—,
where R2 may be selected, for example, from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, 2-pyridyl-CH2—, 3-pyridyl-CH2—, 4-pyridyl-CH2—,
a benzenesulfonyl group of formula




a thiophenesulfonyl group of formula




a group selected from the group of




a group of formula




a group selected from the group of formula




and a group of formula R2A—CO— where R2A may be selected, for example, from the group consisting of a straight or branched alkyl group of 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, an alkyloxy group of 1 to 6 carbon atoms, tetrahydro-3-furanyloxy, —CH2OH, —CF3, —CH2CF3, —CH2CH2CF3, piperonyl, pyrrolidinyl, piperidinyl, 4-morpholinyl, CH3O2C—, CH3O2CCH2—, Acetyl-OCH2CH2—, HO2CCH2—, 3-hydroxyphenyl, 4-hydroxyphenyl, 4-CH3OC6H4CH2—, CH3NH—, (CH3)2N—, (CH3CH2)2N—, (CH3CH2CH2)2N—, HOCH2CH2NH—, CH3OCH2O—, CH3OCH2CH2O—, C6H5CH2O—, 2-pyrrolyl, 2-pyridyl, 3-pyridyl, 4-pyridyl-, 2-pyrazinyl (unsubstituted or substituted with H or an alkyl of 1 to 4 carbon atoms), 2-quinolyl, 3-quinolyl, 4-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 2-quinoxalinyl, a phenyl group of formula




a picolyl group selected from the group consisting of




a picolylamine group selected from the group




a picolyloxy group selected from the group consisting of




a substituted pyridyl group selected from the group consisting of




a group selected from the group consisting of




wherein X′ and Y′, the same or different, may be selected, for example, from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, F, Cl, Br, I, —CF3, —NO2, —NR5R6, —NHCOR5, —OR5, —SR5, —COOR5, —COR5, —CN, —OCF3, and —CH2OH,
wherein R4 may be selected, for example, from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, and a cycloalkyl group of 3 to 6 carbon atoms,
and wherein R5 and R6, the same or different, may be selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, and a cycloalkyl group of 3 to 6 carbon atoms.
In an additional aspect, the present invention relates to a compound of formula II




and pharmaceutically acceptable salts thereof,
where Cx may be selected from the group consisting of CH2OH, COOM′, CONH2, CONR5R6, CH2OR7 where R7 may be selected from the group consisting of (HO)2P(O) and (MO)2P(O), where M′ may be H or an alkali metal or alkaline earth metal, where M may be an alkali metal or alkaline earth metal and a group of formula R7A—CO—, where R7A may be selected from the group consisting of a straight or branched alkyl group of 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, an alkyloxy group of 1 to 6 carbon atom, —CH2OH, CH3O2C—, CH3O2CCH2—, Acetyl-OCH2CCH2—, 2-hydroxyphenyl, 3-hydroxyphenyl, 4-hydroxyphenyl, (CH3)2NCH2—, (CH3)2CHCH(NH2)—, HOCH2CH2NH—, CH3OCH2O—, CH3OCH2CH2O—, 2-pyrrolyl, 2-pyridyl, 3-pyridyl, 4-pyridyl, 1-methyl-1,4-dihydro-3-pyridyl, 2-pyrazinyl, 2-quinolyl, 3-quinolyl, 4-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 2-quinoxalinyl, a phenyl group of formula




a picolyl group selected from the group consisting of




a picolyloxy group selected from the group consisting of




a substituted pyridyl group selected from the group consisting of




a group of formula,




where X and Y, the same or different, may be selected, for example, from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, F, Cl, Br, I, —CF3, —OCF3, —CN, —NO2, —NR5R6, —NHCOR5, —SR5, —COOR5, —COR5, and —CH2OH or X and Y together define an ethylenoxy group of formula —CH2CH2O— or —OCH2CH2— or an alkylenedioxy group selected from the group consisting of a methylenedioxy group of formula —OCH2O— and an ethylenedioxy group of formula —OCH2CH2O—,
wherein R1 may be selected, for example, from the group consisting of a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, 2-pyridyl-CH2—, 4-pyridyl-CH2—,
wherein R2 may be selected, for example, from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, 2-pyridyl-CH2—, 3-pyridyl-CH2—, 4-pyridyl-CH2—, a benzenesulfonyl group of formula




a thiophenesulfonyl group of formula




a group selected from the group of




a group of formula




a group selected from the group of formula




and a group of formula R2A—CO—, where R2A may be selected from the group consisting of a straight or branched alkyl group of 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, an alkyloxy group of 1 to 6 carbon atoms, tetrahydro-3-furanyloxy, —CH2OH, —CF3, —CH2CF3, —CH2CH2CF3, piperonyl, pyrrolidinyl, piperidinyl, 4-morpholinyl, CH3O2C—, CH3O2CCH2—, Acetyl-OCH2CH2—, HO2CCH2—, 3-hydroxyphenyl, 4-hydroxyphenyl, 4-CH3OC6H4CH2—, CH3NH—, (CH3)2N—, (CH3CH2)2N—, (CH3CH2CH2)2N—, HOCH2CH2NH—, CH3OCH2O—, CH3OCH2CH2O—, C6H5CH2O—, 2-pyrrolyl, 2-pyridyl (unsubstituted or substituted), 3-pyridyl (unsubstituted or substituted), 4-pyridyl-(unsubstituted or substituted), 2-pyrazinyl (unsubstituted or substituted with H, or an alkyl of 1 to 4 carbon atoms), 2-quinolyl, 3-quinolyl, 4-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 2-quinoxalinyl,
a phenyl group of formula




a picolyl group selected from the group consisting of




a picolylamine group selected from the group




a picolyloxy group selected from the group consisting of




a substituted pyridyl group selected from the group consisting of




a group selected from the group consisting of




where X′ and Y′, the same or different, may be selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, F, Cl, Br, I, —CF3, —NO2, —NR5R6, —NHCOR5, —OR5, —SR5, —COOR5, —COR5, —CN, —OCF3 and —CH2OH,
where R4 may be selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, and a cycloalkyl group of 3 to 6 carbon atoms,
where R5 and R6, the same or different, may be selected from the group consisting of H, straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, and a cycloalkyl group of 3 to 6 carbon atoms,
where R8 may be selected from the group consisting of
a group selected from the group of




a group selected from the group of




a group of formula




and a group of formula




where R3 may be selected from the group consisting of a phenyl group of formula




a diphenylmethyl group of formula IV




a naphthyl-1-CH2— group of formula V




a naphthyl-2-CH2— group of formula VI




a biphenylmethyl group of formula VII




and an anthryl-9-CH2— group of formula VIII




The present invention further relates to the use of at least one compound described herein for making a pharmaceutical composition, medicament or drug. The compound described herein may be used in the making of a drug for the treatment and/or prevention of HIV infection and/or for the prevention of the apparition of acquired immunodeficiency syndrome (AIDS), and/or for reducing HIV replication and/or its cytopathic effects and/or inhibiting the HIV protease enzyme (e.g., for reducing the activity of an HIV protease) etc.
The present invention further relates to the use of the at least one compound described herein for treating and/or preventing HIV infection and/or AIDS for reducing HIV replication and/or its cytopathic effects and/or inhibiting the HIV protease enzyme or else in an individual in need thereof.
The invention also relates to a method of treating and/or preventing HIV infection and/or AIDS (e.g., for delaying the apparition of AIDS), for reducing HIV replication and/or its cytopathic effects and/or for inhibiting the HIV protease enzyme or else in an individual in need thereof. In accordance with the present invention, the method may comprise administering a compound described herein (or a pharmaceutical composition, drug etc.) to (in) an individual in need thereof.
The present invention more particularly relates to a method of reducing the replication of HIV, the method may comprise providing a cell with a compound described herein (or a pharmaceutical composition, drug etc.) or administering such compound to (in) an individual in need thereof.
The present invention also relates to a process or method for preparing the compounds described herein and the use of intermediate compounds for such purpose.
The compounds of this invention may include pharmaceutically acceptable derivatives of the compounds as described herein. A “pharmaceutically acceptable derivative” means any pharmaceutically acceptable salt (e.g., Na, K, Cs, etc), acetals (i.e., dimethylacetal, diethylacetal, etc), oxime, ammonium or ester (as for example, but not limited to methyl, ethyl, propyl, isopropyl esters, etc) of a compound of this invention.
Pharmaceutical compositions of this invention comprise any of the compounds of the present invention, and pharmaceutically acceptable salts thereof, with any pharmaceutically acceptable carrier, adjuvant or vehicle. Pharmaceutically acceptable carriers, adjuvants and vehicles that may be used in the pharmaceutical compositions of this invention include, but are not limited to ion exchangers, alumina, aluminum stearate, lecithin, serum proteins, such as human serum albumin, buffer substances such as phosphates, glycine, sorbic acid, potassium sorbate, partial glyceride mixtures of saturated vegetable fatty acids, water, salts or electrolytes, such as protamine sulfate, disodium hydrogen phosphate, potassium hydrogen phosphate, sodium chloride, zinc salts, colloidal silica, magnesium trisilicate, polyvinyl pyrrolidone, cellulose-based substances, polyethyleneglycol, sodium carboxymethylcellulose, polyacrylates, waxes, polyethylene-polyoxypropylene-block polymers, polyethylene glycol and wool fat.
The pharmaceutical compositions of this invention may be administered orally, parenterally by inhalation spray, topically, rectally, nasally, buccally, vaginally or via an implanted reservoir. We prefer oral administration or administration by injection. The pharmaceutical compositions of this invention may contain any conventional non-toxic pharmaceutically acceptable carriers, adjuvants or vehicles. The term “parenteral” as used herein includes subcutaneous, intracutaneous, intravenous, intramuscular, intra-articular, intrasynovial, intrasternal, intrathecal, intralesional and intracranial injection or infusion techniques.
The pharmaceutical compositions may be in the form of a sterile injectable preparation, for example, as a sterile injectable aqueous or oleaginous suspension. This suspension may be formulated according to techniques known in the art using suitable dispersing or wetting agents (such as, for example, Tween 80) and suspending agents. The sterile injectable preparation may also be a sterile injectable solution or suspension in a non-toxic 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 amino acid, water, Ringer's solution 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 may be employed including synthetic mono- or diglycerides. Fatty acids, such as oleic acid and its glyceride derivatives are useful in the preparation of injectables, as are natural pharmaceutically-acceptable oils, such as olive oil or castor oil, especially in their polyoxyethylated versions. These oil solutions or suspensions may also contain a long-chain alcohol diluent or dispersant, such as Ph. Helv. or a similar alcohol.
The pharmaceutical compositions of this invention may be orally administered in any orally acceptable dosage form including, but not limited to, capsules, tablets, and aqueous suspension and solutions. In the case of tablets for oral use, carriers that are commonly used include lactose and corn starch. Lubricating agents, such as magnesium stearate, are also typically added. For oral administration in a capsule form, useful diluents include lactose and dried corn starch. When aqueous suspensions are administered orally, the active ingredient is combined with emulsifying and suspending agents. If desired, certain sweetening and/or flavoring and/or coloring agents may be added.
The pharmaceutical compositions of this invention may also be administered in the form of suppositories for rectal administration. These compositions can be prepared by mixing a compound of this invention with a suitable non-irritating excipient which is solid at room temperature but liquid at the rectal temperature and therefore will melt in the rectum to release the active components. Such materials include, but are not limited to, cocoa butter, beeswax, and polyethylene glycols.
Topical administration of the pharmaceutical compositions of this invention is especially useful when the desired treatment involves areas or organs readily accessible by topical application. For application topically to the skin, the pharmaceutical composition should be formulated with a suitable ointment containing the active components suspended or dissolved in a carrier. Carriers for topical administration of the compounds of this invention include, but are not limited to, mineral oil, liquid petroleum, white petroleum, propylene glycol, polyoxyethylene or polyoxypropylene compound, emulsifying wax and water. Alternatively, the pharmaceutical compositions can be formulated with a suitable lotion or cream containing the active compound suspended or dissolved in a carrier. Suitable carriers include, but are not limited to, mineral oil, sorbitan monostearate, polysorbate 60, cetyl esters wax cetearyl alcohol, 2-octyldodecanol, benzyl alcohol and water. The pharmaceutical compositions of this invention may also be topically applied to the lower intestinal tract by rectal suppository formulation or in a suitable neat formulation. Topically-transdermal patches are also included in this invention.
The pharmaceutical compositions of this invention may be administered by nasal aerosol or inhalation. Such compositions are prepared according to techniques well-known in the art of pharmaceutical formulation and may be prepared as solutions in saline employing benzyl alcohol or other suitable preservatives, absorption promoters to enhance bioavailability, fluorocarbons, and/or other solubilizing or dispersing agents known in the art.
Dosage levels of between about 0.01 and about 25 mg/kg body weight per day, preferably between about 0.5 and about 25 mg/kg body weight per day of the active ingredient compound are useful in the prevention and treatment of viral infection, including HIV infection. Typically, the pharmaceutical compositions of this invention will be administered from about 1 to about 5 times per day or alternatively, as a continuous infusion. Such administration can be used as a chronic or acute therapy. The amount of active ingredient that may be combined with the carrier materials to produce a single dosage form will vary depending upon the patient treated and the particular mode of administration. A typical preparation will contain from about 5% to about 95% active compound (w/w). Preferably, such preparations contain from about 20% to about 80% active compound.
Upon improvement of a patient's condition, a maintenance dose of a compound, composition or combination of this invention may be administered if necessary. Subsequently, the dosage or frequency of administration, or both, may be reduced, as a function of the symptoms, to a level at which the improved condition is retained. When the symptoms have been alleviated to the desired level, treatment should cease. Patients may, however, require intermittent treatment on a long-term basis, upon any recurrence of disease symptoms.
As the skilled artisan will appreciate, lower or higher doses than those recited above may be required. Specific dosage and treatment regimen for any particular patient will depend upon a variety of factors, including the activity of the specific compound employed, the age, body weight, general health status, sex, diet, time of administration, rate of excretion, drug combination, the severity and course of the infection, the patient's disposition to the infection and the judgment of the treating physician.
It is to be understood herein, that if a “range” or “group of substances” is mentioned with respect to a particular characteristic (e.g., temperature, concentration, time and the like) of the present invention, the present invention relates to and explicitly incorporates herein each and every specific member and combination of sub-ranges or sub-groups therein whatsoever. Thus, any specified range or group is to be understood as a shorthand way of referring to each and every member of a range or group individually as well as each and every possible sub-ranges or sub-groups encompassed therein; and similarly with respect to any sub-ranges or sub-groups therein. Thus, for example,

    
    
        with respect to the number of carbon atoms, the mention of the range of 1 to 6 carbon atoms is to be understood herein as incorporating each and every individual number of carbon atoms as well as sub-ranges such as, for example, 1 carbon atoms, 3 carbon atoms, 4 to 6 carbon atoms, etc.
    
    


It is in particular to be understood herein that the compound formulae each include each and every individual compound described thereby as well as each and every possible class or sub-group or sub-class of compounds whether such class or sub-class is defined as positively including particular compounds, as excluding particular compounds or a combination thereof; for example an exclusionary definition may read as follows: “provided that when one of A and B is —COOH and the other is H, —COOH may not occupy the 4′ position”.
The compounds of the present invention may be prepared using conventional techniques from readily available starting materials. The detailed descriptions of these approaches are presented herein.
Schemes illustrate a generic example for the preparation of the compounds described herein.
















As it may be appreciated by the person skilled in the art, the above synthetic schemes are not intended to be a comprehensive list of all means by which the compound described and claimed in this application may be synthesized but only represent exemplification of synthesis methods among others. Further methods will be evident to those of ordinary skill in the art.
The compounds of this invention may be modified by appending appropriate functionalities to enhance selective biological properties. Such modifications are known in the art and include those which increase biological penetration into a given biological system (e.g., blood, lymphatic system, central nervous system), increase oral availability, increase solubility to allow administration by injection, alter metabolism and alter rate of excretion.
In the description herein, the following abbreviations are used:














Abbreviation
Meaning









Ac
Acetyl



AcOH
Acetic acid



APCI
Atmospheric pressure chemical ionization



AIDS
Acquired Immunodeficiency Syndrome



AZT
3-Azido-3-deoxythymine (Zidovudine)



Boc
Benzyloxycarbonyl



t-Butyl
tert-Butyl



CAM
Cerium ammonium molybdate



DCM
Dichloromethane



DMAP
N,N-dimethylaminopyridine



DMSO
Dimethylsulfoxide



DMF
Dimethylformamide



DNA
Deoxyribonucleic acid



EDAC
1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide




hydrochloride



EtOAc
Ethyl acetate



EtOH
Ethyl alcohol



g
Gram



h
hour



HIV-1, -2
Human immunodeficiency virus type 1, type 2



HOBt
1-Hydroxybenzotriazole



HPLC
High performance liquid chromatography



HTLV-I, -II
Human T-cell lymphotropic virus type I, type II



IL-2
Interleukin-2



Kg
Kilogram



L
Liter



LC-MS
Liquid chromatography-mass spectrometry



M
Molar



MeOH
Methyl alcohol



mg
Milligram



mp
Melting point



min
Minute



Moc
Methoxycarbonyl



mol
Mole



mL
Milliliter



mmol
Millimole



nm
Nanometer



nM
Nanomolar



po
Orally



rEPO
Recombinant erythropoietin



TLC
Thin layer chromatography



3TC
2′,3′-Dideoxy-3-thiacytidine



TFA
Trifluoroacetic acid



THF
Tetrahydrofuran












DETAILED DESCRIPTION
Examples
This section describes the synthesis of several compounds and their prodrugs useful HIV aspartyl protease inhibitors. These examples are for the purpose of illustration only and are not to be construed as limiting the scope of the invention in any way.
Materials and Methods
Analytical thin layer chromatography (TLC) was carried out with 0.25 mm silica gel E. Merck 60 F254 plates and eluted with the indicated solvent systems. Preparative chromatography was performed by flash chromatography, using silica gel 60 (EM Science) with the indicated solvent systems and positive air pressure to allow proper rate of elution. Detection of the compounds was carried out by exposing eluted plates (analytical or preparative) to iodine, UV light and/or treating analytical plates with a 2% solution of p-anisaldehyde in ethanol containing 3% sulfuric acid and 1% acetic acid followed by heating. Alternatively, analytical plates can be treated with a 0.3% ninhydrin solution in ethanol containing 3% acetic acid and/or a CAM solution made of 20 g (NH4)6Mo7O24 and 8.3 g Ce(SO4)2 polyhydrate in water (750 mL) containing concentrated sulfuric acid (90 mL).
Preparative HPLC were perform on a Gilson apparatus equipped with a C18 column, a 215 liquid handler module and 25 mL/min capacity head pumps. The HPLC is operated with a Gilson UniPoint System Software.
Semi-Preparative HPLC Conditions for Purification of Test Compounds:
HPLC system: 2 Gilson #305-25 mL pumps, Gilson #215 liquid handler for injection and collection and a Gilson #155 UV-Vis absorbance detector, all controlled from a Gilson Unipoint V1.91 software
Column: Alltech (#96053) Hyperprep PEP, C-18, 100 Åα, 8 μm, 22×250 mm
Flow: 15 mL/min
Solvents: A: H2O; B: CH3CN
Gradient: 25% to 80% of B over 40 min
Detector: absorbance; λ: 210 & 265 nm
The crude material dissolved in acetonitrile to a concentration of around 50 to 80 mg/2 mL were injected in each run. Fractions were collected in amounts of 9 mL pertaining absorbance was detected at the UV detector.
Unless otherwise indicated, all starting materials were purchased from a commercial source such as Aldrich Co. or Sigma Co.
Melting points (mp) were determined on a Büchi 530 melting point apparatus in capillary tubes and were uncorrected.
Mass spectra were recorded on a Hewlett Packard LC/MSD 1100 system using APCI or electrospray sources either in negative mode or positive mode.
Nuclear magnetic resonance (NMR) spectra were recorded on a Bruker AMX-II-500 equipped with a reversed or QNP probe. Samples were dissolved in deuterochloroform (CDCl3), deuteroacetone (acetone-d6), deuteromethanol (CD3OD) or deuterodimethylsulfoxide (DMSO-d6) for data acquisition using tetramethylsilane as internal standard. Chemical shifts (#) are expressed in parts per million (ppm), the coupling constants (J) are expressed in hertz (Hz) whereas multiplicities are denoted as s for singlet, d for doublet, 2d for two doublets, dd for doublet of doublets, t for triplet, q for quartet, quint. for quintet, m for multiplet, and br s for broad singlet.
DETAILED DESCRIPTION OF THE INVENTION
General Procedures
General Procedure for the Preparation of Test Compounds
A. General Coupling Procedure with HOBt and EDAC
Method used in scheme 1 of this invention.
To the acid to be condensed (0.8 eq.) and 1-hydroxybenzotriazole (25 mg, 0.18 mmol, 1.2 eq.) in solution in 1 mL of dichloromethane and few drops of dimethylformamide, the minimum as to solubilize the reagents, was added 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (EDAC) (26 mg, 0.14 mmol, 0.9 eq). The mixture was stirred for 15 min before addition of the amine ((1S)-4-amino-N-(4-amino-1-hydroxymethyl-butyl)-N-isobutyl-benzenesulfonamide (VII, example 1, step F)) (50 mg, 0.15 mmol) in 1 mL DMF. The resulting mixture was stirred for several hours, generally overnight, before pouring into an extraction funnel containing 15 mL hydrochloric acid 1.0 N and 30 mL ethyl acetate and extracted. The organic layers were washed with 20 mL of water, dried over magnesium sulfate, filtered and evaporated. The crude mixture was purified by reverse phase semi-preparative HPLC under the conditions described in the materials and methods section. The fractions containing the desired compound were combined and evaporated. The residue was taken up in a minimal amount of acetonitrile, diluted with water and lyophilized.
B. General Coupling Procedure with HOBt and EDAC
Method used in scheme 2 of this invention.
To a suitable vessel was added 100 mg N-substituted amino acids, and a 1 mL aliquot of DMF, 150 mg EDAC, 75 mg HOBt were added. After 30 min at 40° C. 1.5 eq. of the amino amide/acid, (1S)-4-amino-N-(5-amino-1-carboxylamido-pentyl)-N-isobutyl-benzenesulfonamide (step D) was added along with 100 mg N-methyl morpholine. The solution was then stirred at 23° C. for 4-12 h. A 1M K2CO3 (20 mL aliquot) is added and left for 1 h. Then, EtOAc is added (50 mL). The aqueous phase is separated and extracted with citric acid (10%) 50 mL. The organic phase was separated and evaporated. The residue was purified by semi-preparative HPLC and lyophilized.
C. Preparation of Amides and Sulphonamides Using Acid Chlorides and Sulphonyl Chlorides
To the amine dissolved in dichloromethane and N,N-dimethylformamide (DMF), the minimum as to dissolve the product, were added 1.5 eq. of diisopropylethylamine and the mixture cooled in an ice bath under stirring for 10-15 min. The acid/sulphonyl chloride (1.1 eq.) was added dropwise and the reaction continued at 0° C. for 20-30 min and at room temperature an additional 2-4 hours. The reaction mixture was poured into an extraction funnel containing aqueous 1.0N sodium hydroxide and EtOAc and separated. The organic layer was washed with 1.0N hydrochloric acid, with brine, and then dried over magnesium sulfate. The crude product obtained after evaporation was generally purified by semi-preparative HPLC as described earlier (see materials and methods section).
D. Alternative Procedure for the Preparation of Amide Derivatives from Acid Chloride
In a dried flask and under nitrogen atmosphere, dry acetonitrile (1 mL), triethylamine (4 eq.) and N-hydroxybenzotriazole (1.2 eq.) were added and stirred at room temperature. The corresponding acid chloride (1.1 eq.) was added slowly and the mixture was stirred for 30 minutes. The amine (product of example 8 (1 eq.) or other appropriate amine) was then added and the mixture was stirred until completion by TLC (100% EtOAc). The mixture was poured into an extracting funnel containing 50 mL of ethyl acetate. The organic layers were washed with water, saturated NaHCO3 and brine, dried over sodium sulfate, filtered and evaporated. The crude mixture was purified by flash chromatography with 100% AcOEt.
E. General Procedure for the Preparation of Amide Derivatives from Acid
N-Hydroxybenzotriazole (1.9 eq.), 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (EDAC) (2.5 eq.) and the corresponding carboxylic acid (0.8 eq.) were added to 1 mL of N,N-dimethylformamide and stirred at room temperature for 30-60 minutes. The amine (product of example 8 (1 eq.) or other appropriate amine) was then added and the mixture was stirred until completion by TLC (100% EtOAc). The mixture was poured into an extracting funnel with 50 mL of ethyl acetate. The organic layers were washed with water, saturated NaHCO3 and brine, dried over sodium sulfate, filtered and evaporated. The crude mixture was purified by flash chromatography with 100% EtOAc.
F. General Procedure for the Preparation of Secondary Amine Derivatives from Aldehydes
(5S)-2-Amino-N-{5-[(4-amino-benzenesulfonyl)-isobutyl-amino]-6-hydroxy-hexyl}-3-naphthalen-2-yl-propionamide (or the product of example 8 for the ornithine derivatives or other amine) (1.0 eq.) was added to dichloromethane (1 mL) and stirred at 0° C. The corresponding aldehyde (1.0 eq.) and acetic acid (1.0 eq.) were added to the mixture. After stirring for 10 minutes, sodium triacetoxyborohydride (1.5 eq.) was added and the mixture stirred until completion by TLC (100% EtOAc). The solvent was evaporated and the crude mixture was purified by reverse phase semi-preparative HPLC under the conditions described in the Materials and Methods section.
G. General Procedure for the Preparation of Carbamates from Alcohols
In a dried flask and under inert atmosphere, the alcohol was dissolved in dry dichloromethane (0.2M) and dissuccinimidyl carbonate (1.0 eq.) was added. The mixture was stirred at room temperature for 2-3 hours before addition of the solid amine. The mixture was stirred an additional hour and then poured in an extraction funnel containing 1.0N sodium hydroxide and ethyl acetate and extracted. The organic layer was washed with a 1.0N hydrochloric acid solution (if the alcohol moiety do not bear a basic site) and with brine, dried with magnesium sulphate, filtered and evaporated to dryness. The crude residue was then purified by semi-preparative HPLC using the conditions described in the Materials and Methods section.
EXAMPLES
Step A. Preparation of (3S)-3-isobutylamino-azepan-2-one (IV)
L-α-amino-,-caprolactam (22.0 g) was dissolved in cold dichloromethane (DCM, 200 mL). isobutyraldehyde (12.6 g) was added slowly and stirred until the heat evolved was dissipated (water forms at the surface). The cold solution was added to 46.5 g of powdered NaBH(OAc)3 in DCM (0.5 L). AcOH (70 mL) was added to the solution. The slightly turbid mixture was stirred at 20° C. for 4 h. A 500 mL solution of 2M NaOH was added slowly to the turbid mixture and the pH adjust to 11 using a concentrated NaOH solution, and then the mixture stirred for a further 20 min. After extraction, the DCM layer was dried with MgSO4, filtered and evaporated. The oil thus obtained crystallizes slowly on standing (27.8 g, 85%) and was used without further purification in the next step.
1H NMR (CDCl3): δ 0.93 (d, J=6.5, 3H), 0.97 (d, J=6.5, 3H), 1.39 (t, J=9.8, 1H), 1.47 (m, 1H), 1.78-1.65 (m, 2H), 2.00-1.93 (m, 2H), 2.32-2.2 (m, 2H), 2.38 (t, J=9.7, 1H), 3.16 (m, 3H), 6.62 (s, 1H (NH)). mp 52-54° C. (hexanes).
A small sample was converted to the S-methyl benzyl urea by adding the solid to a solution of S-methyl benzyl isocyanate in MeCN. NMR gives 98% ee
Step B. Preparation of Nα-isobutyl-Nα-(4-acetamidobenzenesulfonyl)-L-α-amino-,-caprolactam (V)
Nα-isobutyl-L-α-amino-,-caprolactam (IV) (4.1 g free base) was dissolved in DCM (200 mL) and treated with 4.0 g triethylamine, followed by 4-acetamidobenzenesulfonyl chloride (5.2 g). A 0.1 g portion of dimethylaminopyridine was added and the mixture was stirred 5 h. The resulting thick slurry was poured into 500 mL 0.5 M HCl and shaken vigorously. The solid in the biphasic solution was filtered out and washed with cold acetone to give 7.3 g (87%) of clean product.
1H NMR (DMSO-d6): σ 0.93 (d, J=6.0, 3H), 0.96 (d, J=6.0, 3H), 1.39 (t, J=12.0, 1H), 1.85-1.65 (m, 3H), 2.08-2.18 (m and s, 6H), 2.90-2.97 (m, 1H), 3.00-3.06 (m, 2H), 3.35 (dd, J=14.2, 8.5, 1H), 4.65 (d, J=8.7, 1H), 6.3 (s, 1H), 7.42 (d, J=8.8, 2H), 7.6 (d, J=8.8, 2H). mp 230-233° C. (EtOH).
Step C. Preparation of (3S)-3-{[(4-(acetyl-tert-butoxycarbonyl-amino)-benzenesulfonyl]-isobutyl-amino}-2-oxo-azepane-1-carboxylic acid tert-butyl ester (Boc Activation) (VI)
4.2 g of Nα-isobutyl-Nα-(4-acetamidobenzenesulfonyl)-L-α-amino-,-caprolactam (V) was suspended in 30 mL MeCN and briefly sonicated to break up any large chunks. To this white suspension was added 6.7 g (3 eq.) of di-tert-butyl pyrocarbonate in 10 mL MeCN. The suspension was stirred with a magnetic bar and a 120 mg portion of DMAP was added. The solution becomes a clear light yellow after a few minutes. TLC (EtOAc) reveals 1 product Rf 0.9 (starting material Rf at 0.4). The solution is poured in distilled water 20 mL and extracted with ether, dried with Na2SO4 and evaporated yielding 6.90 g. A sample was recrystallized from hexanes.
1H NMR (DMSO-d6σ 0.68 (d, J=6.0, 3H), 0.85 (d, J=6.0, 3H), 1.39 (s, 10H), 1.47 (s, 9H), 1.85-1.65 (m, 3H), 2.15 (s, 3H), 2.80 (q, J=4, 1H), 3.10-3.36 (m, 2H), 4.01 (d, J=8.0, 1H), 4.85 (d, J=8.7, 1H), 7.32 (d, J=8.8, 2H), 7.87 (d, J=8.8, 2H). mp 123-124° C.
Step D. Preparation of (1S)-4-amino-N-(5-amino-1-hydroxymethyl-pentyl)-N-isobutyl-benzenesulfonamide (VII-deprotected) (Reductive Ring Opening and Deprotection)
A 3.0 g portion of (3S)-3-{[4-(acetyl-tert-butoxycarbonyl-amino)-benzenesulfonyl]-isobutyl-amino}-2-oxo-azepane-1-carboxylic acid tert-butyl ester (VI, step C) is dissolved in 40 mL EtOH followed by 750 mg NaBH4. Brief heating with a heat gun gives a clear solution. TLC reveals one streaky spot after 20 min (EtOAc). The solution is concentrated to a paste, poured in 40 mL 1N NaOH and extracted with ethyl acetate, the organic phase dried with NaSO4 and evaporated to give 2.8 g of product intermediate (VII); (1S)-{4-[(5-tert-butoxycarbonylamino-1-hydroxymethyl-pentyl)-isobutyl-sulfamoyl]-phenyl}-carbamic acid tert-butyl ester (VII).
The above product intermediate is dissolved in 5 mL EtOH and 5 mL 12 N HCl is added. Vigorous gas evolution is observed for a few minutes. After 2 h the solution is evaporated and rendered basic with concentrated KOH and extracted with EtOAc yielding 1.75 g of a white powder.
1H NMR (DMSO-d6): σ 0.82 (m, 6H), 0.97-1.12 (m, 2H), 1.15-1.30 (m, 3H), 1.57 (m, 1H), 1.84 (m, 1H), 2.40 (t, J=7.8, 2H), 2.75 (m, 1H), 2.85 (m, 1H), 3.21 (m, 1H), 3.44 (d, J=6.4, 2H), 5.92 (br s, 2H), 6.59 (d, J=8.0, 2H), 7.39 (d, J=8.0, 2H).
Step A
The preparation of the title is based on scheme 4 of this invention.
(1S,5S)-(1-{5-[(4-amino-benzenesulfonyl)-isobutyl-amino]-6-hydroxy-hexylcarbamoyl}-2-naphthalen-2-yl-ethyl)-carbamic acid tert-butyl ester (698 mg, 1.089 mmol) was added to 6 mL of ethanol and 6 mL of HCl. The mixture was stirred at room temperature until completion by TLC. The ethanol was evaporated and the acidic mixture was poured into an extracting funnel containing 75 mL of ethyl acetate and 50 mL of HCl 1M and separated. The aqueous layer was washed with ethyl acetate. The aqueous phase was basified with pellets of NaOH and poured into an extracting funnel. The organic layer was washed with NaOH 1M and brine, dried over sodium sulfate, filtered, evaporated and dried under vacuum to give 544 mg (92%) of a yellow solid (Rf=0, 100% EtOAc, indicator: ninhydrin).
Step A. Preparation of Nα-isobutyl-Nα-(3,4-methylenedioxybenzenesulfonyl)-L-α-amino-,-caprolactam
(2S)-3-Isobutylamino-azepan-2-one (example 28, step A) 1.0 g was dissolved in DCM (20.0 mL) and treated with 2 ml triethylamine followed by the addition of 3,4-methylenedioxybenzenesulfonyl chloride (900 mg). A 0.05 g portion of DMAP was added and the mixture was stirred 5 h. The resulting solution was poured into mL 0.5 M HCl and shaken vigorously. The organic phase was dried and evaporated to give (1.30 mg) of clean product.
1H NMR (DMSO-d6): *0.93 (d, J=6.0, 3H), 0.96 (d, J=6.0, 3H), 1.26-1.47 (m, 1H), 1.85-1.65 (m, 3H), 2.08-2.28 (m and s, 6H), 2.97-3.07 (m, 1H), 3.11-3.33 (m, 3H), 4.65 (d, J=9.0, 1H), 6.02 (s, 2H), 6.88 (d, J=6.6, 1 H), 7.14 (s, 1H), 7.30 (d, J=6.7 1H).
Step B
Specific Examples for the Preparation of Derivatives of General Formula I
The following prodrugs were prepared from L-lysine derivatives using the procedures summarized herein.
Example 1
Preparation of (1S,5S)-[1-{5-[(4-amino-benzenesulfonyl)-isobutyl-amino]-6-phosphonooxy-hexylcarbamoyl}-2-(2-bromo-phenyl)-ethyl]-carbamic acid methyl ester
Step A. Preparation of (2S)-3-(2-bromo-phenyl)-2-methoxycarbonylamino-propionic acid (or L-Moc-2-bromophenylalanine)
1.0 g L-2-bromophenylalanine (Peptech Corp.) is dissolved in 6 mL 1M K2CO3 followed by 0.77 g methoxycarbonyloxysuccinimide in 20 mL acetone. The resulting clear biphasic solution is stirred for 4 h, then concentrated to 10 mL. The resulting basic solution is extracted with ether and the aqueous phase rendered acidic with 6 M HCl. The oily precipitate is extracted with EtOAc (2×20 mL) and evaporated to yield 1.16 g of a clear oil which crystallizes upon standing.
1H NMR (CD3OD): δ 2.94-3.02 (m, 1H), 3.30-3.36 (m, 1H), 3.51 (s, 3H) 4.52 (t, J=7.6, 1H), 7.04 (t. J=6.8 1H), 7.20-7.26 (m, 2H), 7.52 (d, J=7.0, 2H).
Step B. Preparation of (1S,5S)-[1-{5-[(4-amino-benzenesulfonyl)-isobutyl-amino]-6-phosphonooxy-hexylcarbamoyl}-2-(2-bromo-phenyl)-ethyl]-carbamic acid methyl ester
This compound was prepared as for the preparation of the product of example 3 (step D) with 100 mg of L-Moc-2-bromophenylalanine (step A of this example). The resulting precipitated residue was further purified by reverse phase preparative HPLC. Yields 25 mg of the title compound.
LC-MS: 693.1 (M+H)+, 95% pure.
1H NMR (CD3OD): δ 0.89-0.98 (m, 7H), 1.00-1.15 (m, 2H), 1.26-1.35 (m, 2H), 1.45-1.52 (m, 1H), 1.62-1.70 (m, 1H), 1.88-1.95 (m, 1H), 2.74-2.98 (m, 3H), 2.98-3.16 (m, 3H), 3.20-3.29 (m, 1H), 3.56 (s, 3H), 3.67-3.74 (m, 1H), 3.81-3.89 (m, 1H), 3.99-4.05 (m, 1H), 4.39 (t, J=7.0, 1H), 6.75 (d, J=8.0, 2H), 7.10-7.17 (m, 1H), 7.24 (s, 1H), 7.50 (d, J=8.0, 2H), 7.58-7.61 (m, 1H).
31P NMR (CD3OD): δ 2.75
Example 2
Preparation of (2S,2S) phosphoric acid mono-(2-[(4-aminobenzenesulfonyl)-isobutyl-amino]-6-{3-(2-bromo-phenyl)-2-[(2-methyl-pyridine-3-carbonyl)-amino]-propionylamino}-hexyl)ester
The title derivative was prepared as for the synthesis of the product of example 3 (step D) with 100 mg of 3-(2-bromo-phenyl)-2-[(2-methyl-pyridine-3-carbonyl)-amino]-propionic acid. Yields 70 mg of the title compound. The 3-(2-bromo-phenyl)-2-[(2-methyl-pyridine-3-carbonyl)-amino]-propionic acid starting material was easily prepared from the coupling of L-2-bromophenylalanine (Peptech Corp.) and 2-methyl-nicotinoyl chloride.
LC-MS: 769.6 (M+H)+, 95% pure.
1H NMR (CD3OD): δ 0.83-0.99 (m, 8H), 1.00-1.15 (m, 2H), 1.26-1.35 (m, 2H), 1.45-1.52 (m, 1H), 1.62-1.70 (m, 1H), 1.88-1.95 (m, 1H), 2.84-2.98 (m, 2H), 2.98-3.86 (m, 3H), 3.20-3.29 (m, 1H), 3.56 (s, 3H), 3.67-3.69 (m, 1H), 3.81-3.89 (m, 1H), 3.99-4.05 (m, 1H), 4.99 (t, J=7.0, 1H), 6.68 (d, J=8.0, 2H), 7.03-7.32 (m, 4H), 7.50 (d, J=8.0, 1H), 7.57 (t, J=7.8, 1H), 7.71 (t, J=7.8, 1H), 8.43 (d, J=7.8 1H).
31P NMR (CD3OD): δ 2.68
Example 3
Preparation of (2S,2S) phosphoric acid mono-(2-[(4-aminobenzenesulfonyl)-isobutyl-amino]-6-{3-(2-bromo-phenyl)-2-[(pyridine-4-carbonyl)-amino]-propionylamino}-hexyl)ester
This compound was done as for the preparation of the product of example 3 (step D) with 100 mg of L-3-(2-bromo-phenyl)-2-[(pyridine-4-carbonyl)-amino]-propionic acid. The precipitated residue was further purified by reverse phase preparative HPLC. Yields 65 mg of the desired material. The L-3-(2-bromo-phenyl)-2-[(pyridine-4-carbonyl)-amino]-propionic acid starting material was easily prepared from the combination of L-2-bromophenylalanine (Peptech Corp.) and isonicotinoyl chloride mono hydrochloride (Aldrich).
LC-MS: 755.8 (M+H)+, 95% pure.
1H NMR (CD3OD): δ 0.83-0.99 (m, 8H), 1.00-1.15 (m, 2H), 1.26-1.35 (m, 2H), 1.45-1.52 (m, 1H), 1.62-1.70 (m, 1H), 1.88-1.95 (m, 1H), 2.84-2.98 (m, 2H), 2.98-3.86 (m, 3H), 3.20-3.29 (m, 1H), 3.56 (s, 3H), 3.67-3.69 (m, 1H), 3.81-3.89 (m, 1H), 3.99-4.05 (m, 1H), 4.99 (t, J=7.0, 1H), 6.68 (d, J=8.0, 2H), 7.03-7.32 (m, 4H), 7.50 (d, J=8.0, 1H), 7.70 (d, J=7.8, 2H), 8.73 (d, J=7.8 2H).
31P NMR (CD3OD): δ 3.28
Example 4
Preparation of (1S,5S)-[1-{5-[(4-amino-benzenesulfonyl)-isobutyl-amino]-6-phosphonooxy-hexylcarbamoyl}-2-(2-fluoro-phenyl)-ethyl]-carbamic acid methyl ester
The title compound was synthesized as for the preparation of the product of example 3 (step D) with 100 mg of L-3-(2-fluoro-phenyl)-2-methoxycarbonylamino-propionic acid (or L-Moc-2-fluorophenylalanine). Yields 14.5 mg 35% of the desired material. The L-3-(2-fluoro-phenyl)-2-methoxycarbonylamino-propionic acid starting material was easily prepared from the combination of L-2-fluorophenylalanine (Peptech Corp.) and methoxycarbonyloxysuccinimide as in example 4 (step A).
LC-MS: 647.2 (M+H)+, 95% pure.
1H NMR (CD3OD): δ 0.90 (d, J=3.5, 6H), 0.95-1.01 (m, 1H), 1.02-1.11 (m, 1H), 1.25-1.32 (m, 2H), 1.40-1.49 (m, 1H), 1.56-1.67 (m, 1H), 1.86-1.95 (m, 1H), 2.82-2.90 (m, 1H), 2.90-2.96 (m, 2H), 2.98-3.03 (m, 1H), 3.08-3.14 (m, 2H), 3.59 (s, 3H), 3.74-3.76 (m, 1H), 3.88-3.92 (m, 1H), 4.02-4.06 (m, 1H), 4.33-4.35 (m, 1H), 6.74 (d, J=8.2, 2H), 7.04-7.12 (m, 2H), 7.25-7.30 (m, 2H), 7.53 (d, J=8.2, 2H).
31P NMR (CD3OD): δ 2.75
Example 5
Preparation of (1S,5S) [1-{5-[(4-amino-benzenesulfonyl)-isobutyl-amino]-6-phosphonooxy-hexylcarbamoyl}-2-(2-chloro-phenyl)-ethyl]-carbamic acid methyl ester
This derivative was made as for the preparation of the product of example 3 (step D) with 100 mg of L-3-(2-chloro-phenyl)-2-methoxycarbonylamino-propionic acid (or L-Moc-2-chlorophenylalanine). Yields 71 mg of the desired material. The L-3-(2-chloro-phenyl)-2-methoxycarbonylamino-propionic acid starting material was easily prepared from the combination of L-2-chlorophenylalanine (Peptech Corp.) and methoxycarbonyloxysuccinimide as in example 4 (step A).
LC-MS: 664.3 (M+H)+, 95% pure.
1H NMR (CD3OD): δ 0.89-0.98 (m, 8H), 1.00-1.15 (m, 2H), 1.26-1.35 (m, 2H), 1.45-1.52 (m, 1H), 1.62-1.70 (m, 1H), 1.88-1.95 (m, 1H), 2.84-2.98 (m, 2H), 2.98-3.06 (m, 3H), 3.20-3.29 (m, 1H), 3.56 (s, 3H), 3.67-3.69 (m, 1H), 3.81-3.89 (m, 1H), 3.99-4.05 (m, 1H), 4.39 (t, J=7.0, 1H), 7.05 (d, J=8.0, 2H), 7.16-7.25 (m, 3H), 7.34 (s, 1H), 7.75 (d, J=8.0, 2H).
31P NMR (CD3OD): δ 2.47
Example 6
Preparation of (1S,5S) [1-{5-[(4-amino-benzenesulfonyl)-isobutyl-amino]-6-phosphonooxy-hexylcarbamoyl}-2-(4-bromo-phenyl)-ethyl]-carbamic acid methyl ester
This derivative was synthesized using the procedure described for the preparation of (1S,5S)-[1-{5-[(4-amino-benzenesulfonyl)-isobutyl-amino]-6-phosphonooxy-hexylcarbamoyl}-2-(2-bromo-phenyl)-ethyl]-carbamic acid methyl ester (example 4, steps A and B) using L-4-bromophenylalanine (Peptech Corp.) instead of L-2-bromophenylalanine. The desired material was obtained in 28% yield (25 mg)
LC-MS: 707.0 (M+H)+, 95% pure.
1H NMR (CD3OD): δ 0.90 (d, J=5.9, 6H), 1.00-1.17 (m, 2H), 1.20-1.30 (m, 2H), 1.39-1.50 (m, 1H), 1.55-1.69 (m, 1H), 1.86-1.99 (m, 1H), 2.79-2.90 (m, 2H), 2.91-3.11 (m, 4H), 3.59 (s, 3H), 3.75-3.79 (m, 1H), 3.86-3.92 (m, 1H), 4.02-4.08 (m, 1H), 4.20-4.30 (m, 1H), 6.76 (d, J=8.2, 2H), 7.15 (d, J=7.8, 2H), 7.42 (d, J=7.8, 2H), 7.54 (d, J=8.2, 2H).
31P NMR (CD3OD): δ 2.74
Example 7
This compound was prepared based on Scheme 2
Preparation of (1S)-4-amino-N-(5-amino-1-carboxamido-pentyl)-N-isobutyl-benzenesulfonamide (Reductive Ring Opening and Deprotection)
A 3.0 g portion of (3S)-3-{[4-(acetyl-tert-butoxycarbonyl-amino)-benzenesulfonyl]-isobutyl-amino}-2-oxo-azepane-1-carboxylic acid tert-butyl ester (VI, step C) is dissolved in 40 mL EtOH followed by 1 mL NH4OHconc. Brief heating with a heat gun gives a clear solution. TLC reveals one streaky spot after 20 min (EtOAc). The solution is concentrated to a paste, poured in 40 mL 1N NaOH and extracted with ethyl acetate, the organic phase dried with NaSO4 and evaporated to give 2.8 g of product intermediate; (1S)-{1-[(5-tert-butoxycarbonylamino-1-hydroxymethyl-pentyl)-isobutyl-sulfamoyl]-phenyl}-carbamic acid tert-butyl ester (VII).
The above product intermediate is dissolved in 5 mL EtOH and 5 mL 12 N HCl is added. Vigorous gas evolution is observed for a few minutes. After 2 h the solution is evaporated and rendered basic with concentrated KOH and extracted with EtOAc yielding 1.75 g of a white powder.
100 mg portion of the above was added to a solution of 100 mg Moc-Dip in 2 mL DMF containing 2 eq of EDAC and 1 eq HOBt. The solution was reacted for 30 min and poured into 1 M K2CO3. The turbid solution was extracted with EtOAc and the organic phase dried with Na2SO4 the evaporated to dryness. The residue was then purified by RP-HPLC.
LC-MS: 638.3 (M+H)+, 95% pure
Example 8
This compound was prepared based on Scheme 2
As in example 7 using Acetyl-DIP.
LC-MS: 622.4 (M+H)+, 95% pure
Example 9
This compound was prepared based on Scheme 2
LC-MS: 667.4 (M+H)+, 95% pure
Example 10
This compound was prepared based on Scheme 2
LC-MS: 639.2 (M+H)+, 95% pure
Example 11
This compound was prepared based on Scheme 1 and 3
The compound was prepared from general procedure A using (2S)-2-tert-butoxycarbonylamino-2-naphthyl-propionic acid and (1S)-4-amino-N-(5-amino-1-hydroxymethyl-pentyl)-N-isobutyl-benzenesulfonamide (above) but the product was purified by flash chromatography yielding 49% of the Boc derivative. This product was treated with trifluoroacetic acid to give the amine in 96% yield using the same conditions as described for the preparation of (2S,4S)-2-amino-N-{4-[(4-amino-benzenesulfonyl)-isobutyl-amino]-5-hydroxy-pentyl}-2-naphthyl-propionamide. The product was used without further purification. The product was reacted with benzene sulfonyl chloride using general procedure C.
LC-MS: 682.1 (M+H)+, 95% pure
Example 12
This compound was prepared based on Scheme 1 and 3
Prepared as in example 11 using 2-thiophene-sulphonyl chloride throught general procedure C.
LC-MS: 688.1 (M+H)+, 95% pure
Example 13
This compound was prepared based on Scheme 1
LC-MS: 594.4 (M+H)+, 95% pure
Example 14
This compound was prepared based on Scheme 1
LC-MS 623.4 (M+H)+, 95% pure
Example 15
This compound was prepared based on Scheme 1 and 3
LC-MS: 681.8 (M+H)+, 95% pure
Example 16
This compound was prepared based on Scheme 1
LC-MS: 697.9 (M+H)+, 95% pure
Example 17
This compound was prepared based on Scheme 1
LC-MS: 710.8 (M+H)+, 95% pure
Example 18
This compound was prepared based on Scheme 1 and 3
The compound was prepared from general procedure A using (2S)-2-tert-butoxycarbonylamino-2-bromophenyl-propionic acid and (1S)-4-amino-N-(5-amino-1-hydroxymethyl-pentyl)-N-isobutyl-benzenesulfonamide (above) but the product was purified by flash chromatography. This product was treated with trifluoroacetic acid to give the amine in 96% yield using the same conditions as described for the preparation of (2S,4S)-2-amino-N-{4-[(4-amino-benzenesulfonyl)-isobutyl-amino]-5-hydroxy-pentyl}-2bromophenyl-propionamide. The product was used without further purification. The product was reacted with 3-hydroxy-2-methyl benzoic acid using general procedure E.
LC-MS 704.8 (M+H)+, 95% pure
Example 19
This compound was prepared based on Scheme 1 and 3
As in example 18 using 6-hydroxy-2-picolinic acid through general procedure E
LC-MS: 691.8 (M+H)+, 95% pure
Example 20
This compound was prepared based on Scheme 1 and 3
The compound was prepared from general procedure A using (2S)-2-tert-butoxycarbonylamino-(2-methyl-phenyl)-propionic acid and (1S)-4-amino-N-(5-amino-1-hydroxymethyl-pentyl)-N-isobutyl-benzenesulfonamide (above) but the product was purified by flash chromatography. This product was treated with trifluoroacetic acid to give the amine in 96% yield using the same conditions as described for the preparation of (2S,4S)-2-amino-N-{4-[(4-amino-benzenesulfonyl)-isobutyl-amino]-5-hydroxy-pentyl}-(2-methyl-phenyl)propionamide. The product was used without further purification. The product was reacted with nicotinic acid using general procedure E.
LC-MS: 610.8 (M+H)+, 95% pure
Example 21
This compound was prepared based on Scheme 1 and 3
As in example 20 using 6-methyl-nicotinic acid through general procedure E
LC-MS: 624.8 (M+H)+, 95% pure
Example 22
This compound was prepared based on Scheme 1 and 3
As in example 20 using 4-picolinic acid through general procedure E
LC-MS: 610.8 (M+H)+, 95% pure
Example 23
This compound was prepared based on Scheme 1 and 3
As in example 20 using 2-hydroxy-3-methyl benzoic acid through general procedure E
LC-MS: (M+H)+, 95% pure
Example 24
This compound was prepared based on Scheme 1 and 3
The compound was prepared from general procedure A using (2S)-2-tert-butoxycarbonylamino-(cyclohexyl)-propionic acid and (1S)-4-amino-N-(5-amino-1-hydroxymethyl-pentyl)-N-isobutyl-benzenesulfonamide (above) but the product was purified by flash chromatography. This product was treated with trifluoroacetic acid to give the amine in 96% yield using the same conditions as described for the preparation of (2S,4S)-2-amino-N-{4-[(4-amino-benzenesulfonyl)-isobutyl-amino]-5-hydroxy-pentyl}-(cyclohexyl)propionamide. The product was used without further purification. The product was reacted with methyl chloroformate using general procedure C.
LC-MS: 639.8 (M+H)+, 95% pure
Example 25
This compound was prepared based on Scheme 1 and 3
As in example 24 using nicotinic acid through general procedure E
LC-MS: 602.8 (M+H)+, 95% pure
Example 26
This compound was prepared based on Scheme 1 and 3
As in example 24 using 6-methylnicotinic acid through general procedure E
LC-MS: 616.8 (M+H)+, 95% pure
Example 27
This compound was prepared based on Scheme 1
LC-MS: (M+H)+, 95% pure
Example 28
This compound was prepared based on Scheme 1
Preparation of (1S)-benzo[1,3]dioxole-5-sulfonic acid (5-amino-1-hydroxymethyl-pentyl)-isobutyl-amide
This compound was prepared from Nα-isobutyl-Nα-(3,4-methylenedioxybenzenesulfonyl)-L-α-amino-,-caprolactam (step A) in a three step reaction sequence (Boc activation, reductive ring opening and deprotection) as described for the preparation of (1S)-4-amino-N-(5-amino-1-hydroxymethyl-pentyl)-N-isobutyl-benzenesulfonamide (example 28, steps C and D). The final product was obtained in 75% yield and was used as such in the next step.
LC-MS: 717.8 (M+H)+, 95% pure
Example 29
This compound was prepared based on Scheme 1 and 3
The compound was prepared from general procedure A using (2S)-2-tert-butoxycarbonylamino-2-chlorophenyl-propionic acid and (1S)-4-amino-N-(5-amino-1-hydroxymethyl-pentyl)-N-isobutyl-benzenesulfonamide (above) but the product was purified by flash chromatography. This product was treated with trifluoroacetic acid to give the amine in 96% yield using the same conditions as described for the preparation of (2S,4S)-2-amino-N-{4-[(4-amino-benzenesulfonyl)-isobutyl-amino]-5-hydroxy-pentyl}-2-chlorophenyl-propionamide. The product was used without further purification. The product was reacted with 4-picolinic acid using general procedure E.
LC-MS: 630.2 (M+H)+, 95% pure
Example 30
This compound was prepared based on Scheme 1 and 3
As in example 29 using 2-methylnicotinic acid through general procedure E
LC-MS: 645.2 (M+H)+, 95% pure
Example 31
This compound was prepared based on Scheme 1
LC-MS: 727.2 (M+H)+, 95% pure
Example 32
This compound was prepared based on Scheme 1
LC-MS: 652.3 (M+H)+, 95% pure
Example 33
This compound was prepared based on Scheme 1
Preparation of (3S)-3-(4-pyridylmethyl)1amino-azepan-2-one intermediate was effected as in the synthesis (3S)-3-isobutylamino-azepan-2-one using pyridine-4 carbaldehyde.
LC-MS: 660.3 (M+H)+, 95% pure
Example 34
This compound was prepared based on Scheme 1
LC-MS: 707.3 (M+H)+, 95% pure
Example 35
This compound was prepared based on Scheme 1
LC-MS: 681.8 (M+H)+, 95% pure
Example 36
This compound was prepared based on Scheme 1 and 3
As in example 18 using 3-methyl-2 picolinic acid acid through general procedure E
LC-MS: 689.3 (M+H)+, 95% pure
Example 37
This compound was prepared based on Scheme 1 and 3
As in example 18 using 3-hydroxy-4-methyl benzoic acid through general procedure E
LC-MS: 704.3 (M+H)+, 95% pure
Example 38
This compound was prepared based on Scheme 1 and 3
As in example 18 using 4-pyridine carbinol acid through general procedure G
LC-MS: 705.3 (M+H)+, 95% pure
Example 39
This compound was prepared based on Scheme 1 and 3
As in example 18 using 2-methyl nicotinic acid acid through general procedure E
LC-MS: 689.3 (M+H)+, 95% pure
Example 40
This compound was prepared based on Scheme 1 and 3
As in example 18 using 6-methyl nicotinic acid through general procedure E
LC-MS: 689.3 (M+H)+, 95% pure
Example 41
This compound was prepared based on Scheme 1 and 3
As in example 18 using 3,4 methylene dioxybenzoic acid through general procedure E
LC-MS: 718.3 (M+H)+, 95% pure
Example 42
This compound was prepared based on Scheme 1 and 3
As in example 18 using 4-picolinic acid through general procedure E
LC-MS: 675.3 (M+H)+, 95% pure
Example 43
This compound was prepared based on Scheme 1 and 3
As in example 18 using 5-methyl-pyrazine carboxylic acid through general procedure E
LC-MS: 690.3 (M+H)+, 95% pure
Example 44
This compound was prepared based on Scheme 1 and 3
As in example 18 using 2-pyrazine carboxylic acid through general procedure E
LC-MS: 676.3 (M+H)+, 95% pure
Example 45
This compound was prepared based on Scheme 1 and 3
As in example 18 using 2-pyridine carboxylic acid through general procedure E
LC-MS: 675.3 (M+H)+, 95% pure
Example 46
This compound was prepared based on Scheme 1 and 3
As in example 18 using nicotinic acid through general procedure E
LC-MS: 675.3 (M+H)+, 95% pure
Enzymatic Assay for Determining the Inhibition Constant (Ki) of Synthetic Compounds Targeting the HIV Protease
This is a fluorometric assay based on the cleavage by protease of a substrate carrying a donor group (EDANS) and an acceptor group (DABCYL) on each side of the cleavage site, interacting together through fluorescence resonance energy transfer (FRET) as described by Matayoshi et al. (Science 247:954-954, 1990).
After calculation of Vo and Vi, the inhibition constant (Ki) of the compound is determined using the equation of Henderson:




  
    Vo
    Vi
  
  =
  
    
      1
      +
      
        
          
            [
            I
            ]
          
          
            Ki
            app
          
        
        ⁢
        
          
        
        ⁢
        Where
        ⁢
        
          
        
        ⁢
        Ki
      
    
    =
    
      
        Ki
        app
      
      
        
          1
          +
          
            [
            S
            ]
          
        
        Km
      
    
  




where Vo=the enzyme's initial velocity
Vi=the enzyme velocity in the presence of the inhibitory compound,
[I]=inhibitor concentration, [S]=substrate concentration,
Km=Michaelis-Menten constant and Kiapp=apparent Ki
Graphs are traced and the Ki determined using GraphPad Prism software v. 3.0.
Anti-Viral and Cytotoxicity Assays in Vitro

    
    
        To evaluate the EC50 of our compounds, various drug concentrations are incubated with the infected cell for six days and then the metabolic activity of the cells is monitored by the MTT assay. (See A. J. Japour et al., Antimicrobial Agents and Chemotherapy, 37, 1095-1101, 1993 and R. Pauwels et al. Journal of Virological Methods, 20, 309-321, 1988)
        We use the laboratory viral strain NL4.3 as wild type virus and the cell line used is MT-4 which is a T-cell line highly sensitive to HIV-1. We also use some WT clinical strains. To address the resistance issue we assay the inhibitors with NL4.3 mutants which are designed to be resistant to specific commercially available inhibitors.
        The same MTT assay is used to evaluate the CCIC50 (cell culture of IC50) of our compounds except that the virus is omitted.
    
    


The compounds listed in Table 1 were prepared as indicated above. The numbers of the compounds listed in Table 1 (Ex. No.) corresponds to the example numbers presented above.
The activities of the compounds are listed in Table 2, demonstrating their potential usefulness. The CCIC50 are not shown in the table but it was found that the average CCIC50 for HIV protease inhibitors of the invention was 30+/−20 μM with a range of 6 to 100 μM. Ki, IC50 and EC50 results for compounds of formula I are presented in Table 2, illustrating their potential usefulness.







TABLE 1







Structures of exemplary embodiments of HIV aspartyl protease inhibitors in


accordance with this invention









I

























Ex.








D, L, DL


No.
X
Y
R1
Cx
R2
R3
R4
n
R, S, RS





 1
H
4-NH2
Iso-butyl-
—CH2O—(HO)2P(O)
CH3O—CO
2-BrC6H4CH2
H
4
S, S


 2
H
4-NH2
Iso-butyl-
—CH2O—(HO)2P(O)
2-CH3-3-pyridyl-
2-BrC6H4CH2
H
4
S, S







CO






 3
H
4-NH2
Iso-butyl-
—CH2O—(HO)2P(O)
4-Pyridyl-CO
2-BrC6H4CH2
H
4
S, S


 4
H
4-NH2
Iso-butyl-
—CH2O—(HO)2P(O)
CH3O—CO
2-FC6H4CH2
H
4
S, S


 5
H
4-NH2
Iso-butyl-
—CH2O—(HO)2P(O)
CH3O—CO
2-ClC6H4CH2
H
4
S, S


 6
H
4-NH2
Iso-butyl-
—CH2O—(HO)2P(O)
CH3O—CO
4-BrC6H4CH2
H
4
S, S


 7
H
4-NH2
Iso-butyl-
—CONH2
CH3O—CO
(C6H5)2CH
H
4
S, S


 8
H
4-NH2
Iso-butyl-
—CONH2
CH3—CO
(C6H5)2CH
H
4
S, S


 9
H
4-NH2
Iso-butyl-
—CONH2
4-Morpholine-
Naphthyl-1-CH2
H
4
S, S







CO






10
H
4-NH2
Iso-butyl-
—COOH
CH3O—CO
(C6H5)2CH
H
4
S, S







3-O—CF3—






 


47
H
4-NH2
Iso-butyl-
—CH2OH
Benzenesulfonyl
Naphthyl-2-CH2
H
4



 


48
H
4-NH2
Iso-butyl-
—CH2OH




Naphthyl-2-CH2
H
4



 


49
H
4-NH2
Iso-butyl-
—CH2OH
2F—,4F—
Naphthyl-2-CH2
H
4








Benzenesulfonyl






50
H
4-NH2
Iso-butyl-
—CH2OH
3-MeO-4-MeO-
Naphthyl-2-CH2
H
4








benzenesulfonyl






 


51
H
4-NH2
Iso-butyl-
—CH2OH




Naphthyl-2-CH2
H
4



 


52
H
4-NH2
Iso-butyl-
—CH2OH




Naphthyl-2-CH2
H
4



 


53
H
4-NH2
Iso-butyl-
—CH2OH
4-CN—
Naphthyl-2-CH2
H
4








Benzenesulfonyl






 


54
H
4-NH2
Iso-butyl-
—CH2OH




Naphthyl-2-CH2
H
4



 


55
H
4-NH2
Iso-butyl-
—CH2OH




Naphthyl-2-CH2
H
4



 


56
H
4-NH2
Iso-butyl-
—CH2OH
2-Pyridyl-CH2—
Naphthyl-2-CH2
H
4



57
H
4-NH2
Iso-butyl-
—CH2OH
Thiophene 2-SO2
(C6H5)2CH
H
4



58
H
4-NH2
Iso-butyl-
—CH2OH
benzenesulfonyl
(C6H5)2CH
H
4



59
4-F
3-NH2
Iso-butyl-
—CH2OH
benzenesulfonyl
Naphthyl-2-CH2
H
4



60
4-F
3-NH2
Iso-butyl-
—CH2OH
Thiophene 2-SO2
Naphthyl-2-CH2
H
4



61
H
4-NH2
Iso-butyl-
—CH2OH
3-Picolyl-NH—
(C6H5)2CH
H
4








CO






62
H
4-NH2
Iso-butyl-
—CH2OH
4-Picolyl-NH—
(C6H5)2CH
H
4








CO


























D, L, DL


Ex. No.
X/Y
R1
Cx
R2
R3
R4
n
R, S, RS





11
4-NH2/H
i-C4H9
—CH2OH
C6H5SO2
Naphthyl-2-CH2
H
4
S, S


12
4-NH2/H
i-C4H9
—CH2OH
Thiophene 2-SO2
Naphthyl-1-CH2
H
4
S, S


 


13
4-OCH2CH2-3
i-C4H9
—CH2OH
CH3O—CO
2-F-Phenyl-CH2
H
4
S, RS


 


 14*




i-C4H9
—CH2OH
CH3O—CO
2-F-phenyl-CH2
H
4
S, S


 


15
4-OCH2CH2-3
i-C4H9
—CH2OH
4-Morpholine-CO
Naphthyl-1-CH2
H
4
S, S


16
4-OCH2CH2O-3
i-C4H9
—CH2OH
4-Morpholine-CO
Naphthyl-1-CH2
H
4
S, S


17
4-OCH2CH2-3
i-C4H9
—CH2OH
4-Morpholine-CO
2-BrC6H4CH2
H
4
S, S


18
4-NH2/H
i-C4H9
—CH2OH
3-OH-2Me-Ph-CO
2-BrC6H4CH2
H
4
S, S


19
4-NH2/H
i-C4H9
—CH2OH
6-OH picoloyl
2-BrC6H4CH2
H
4
S, S


20
4-NH2/H
i-C4H9
—CH2OH
nicotinoyl
2-Me-C6H4CH2
H
4
S, S


21
4-NH2/H
i-C4H9
—CH2OH
6-Me-Nicotinoyl
2-Me-C6H4CH2
H
4
S, S


22
4-NH2/H
i-C4H9
—CH2OH
4-Pyridyl-CO
2-Me-C6H4CH2
H
4
S, S


23
4-NH2/H
i-C4H9
—CH2OH
2-OH-3-Me-
2-Me-C6H4CH2
H
4
S, S






Phenyl-CO






63
4-NH2/H
i-C4H9
—CH2OH
3-OH-4-Me-
2-Me-C6H4CH2
H
4
S, S






Phenyl-CO






24
4-NH2/H
i-C4H9
—CH2OH
CH3O—CO
Cyclohexyl-CH2
H
4
S, S


25
4-NH2/H
i-C4H9
—CH2OH
Nicotinoyl
Cyclohexyl-CH2
H
4
S, S


26
4-NH2/H
i-C4H9
—CH2OH
6-Me-Nicotinoyl
Cyclohexyl-CH2
H
4
S, S


27
8-quinoline
i-C4H9
—CH2OH
CH3O—CO
(C6H5)2CH
H
4
S, S



sulfonyl









28
3,4 methylene
i-C4H9
—CH2OH
6-OH-picoloyl
(C6H5)2CH
H
4
S, S



dioxy









29
4-NH2/H
i-C4H9
—CH2OH
4-Pyridyl-CO
2-Cl-Phenyl-CH2
H
4
S, S


30
4-NH2/H
i-C4H9
—CH2OH
2-Me-nicotinoyl
2-Cl-Phenyl-CH2
H
4
S, S


31
3,4(—OCH2CH2O—)
i-C4H9
—CH2OH
4-Morpholin-CO
(2-Br-Phenyl-CH2
H
4
S, S


32
4-OCH2CH2-3
i-C4H9
—CH2OH
CH3O—CO
(C6H5)2CH
H
4
S, S


33
4-NH2/H
CH2-3-Pyridyl
—CH2OH
CH3O—CO
(C6H5)2CH
H
4



34
4-OCH2CH2-3
i-C4H9
—CH2OH
4-Morpholine-CO
(C6H5)2CH
H
4
S, S


 


 35*




i-C4H9
—CH2OH
H
(C6H5)2CH
H
4
S, S


 


36
4-NH2/H
i-C4H9
—CH2OH
3-Me-2-pyridyl-
(2-Br-Phenyl-CH2
H
4
S, S






CO






37
4-NH2/H
i-C4H9
—CH2OH
3-OH-4-Me-
(2-Br-Phenyl-CH2
H
4
S, S






Phenyl-CO






38
4-NH2/H
i-C4H9
—CH2OH
4-PicolylO—CO
(2-Br-Phenyl-CH2
H
4
S, S


39
4-NH2/H
i-C4H9
—CH2OH
2-Me-Nicotinoyl
(2-Br-Phenyl-CH2
H
4
S, S


40
4-NH2/H
i-C4H9
—CH2OH
6-Me-Nicotinoyl
(2-Br-Phenyl-CH2
H
4
S, S


41
4-NH2/H
i-C4H9
—CH2OH
piperonoyl
(2-Br-Phenyl-CH2
H
4
S, RS


42
4-NH2/H
i-C4H9
—CH2OH
4-Pyridyl-CO
(2-Br-Phenyl-CH2
H
4
S, S


43
4-NH2/H
i-C4H9
—CH2OH
5-Me-2-
(2-Br-Phenyl-CH2
H
4
S, S






Piperazinoly






44
4-NH2/H
i-C4H9
—CH2OH
2-piperazine-CO
(2-Br-Phenyl-CH2
H
4
S, S


45
4-NH2/H
i-C4H9
—CH2OH
2-pyridine-CO
((2-Br-Phenyl-CH2
H
4
S, S


46
4-NH2/H
i-C4H9
—CH2OH
nicotinoyl
(2-Br-Phenyl-CH2
H
4
S, S





*corresponds to R8 in formula II













TABLE 2







Exemplary embodiments of further HIV aspartyl protease inhibitors.

















ANTI-HIV-




KI—CALC
KIGRAPHIC
IC50
EC50




ENZYME
ENZYME
ENZYME
VIRAL




HIV-1
HIV-1
HIV-1
STRAIN




Protease
Protease
Protease
NL4-3


Object ID
Structure
nM
nM
nM
nM















EX. 11




16.5


3200


 


EX. 12




7.9


3000


 


EX 47




55.7





 


EX 48




5.1

4.95
0.162


 


EX 49




54.6





 


EX 50




12.5





 


EX 51




26.2





 


EX 52




247.9





 


EX 53




37.4





 


EX 54




11.4





 


EX 55




<3.8
0.788
0.878
1375


 


Ex 56




4.9

5.898
>50000


 


EX 57




<3.8
0.541
0.601
64


 


EX 58




<3.8
0.492
0.436
61


 


EX 59




24.6





 


EX 60




10.5


>50000


 


EX 61




<3.8
0.473
0.465
171


 


EX 62




<3.8
0.443
0.51
170


 


EX. 7





0.049 0.042
0.652 0.507
30


 


EX. 33




<3.8

1.007
196


 


EX. 8




<3.8

1.073
238


 


EX. 9




<3.8
0.572
0.58
70


 


EX. 10





0.79
1.08
>50000


 


EX. 44





0.318
0.471
60


 


EX. 45





0.429
0.615
197


 


EX. 46





0.119
0.372
58


 


EX. 41





0.05
0.336
43


 


EX. 42




<3.8
0.182
0.618
40


 


EX. 39




<3.8
0.183
0.58
70


 


EX. 40




<3.8
0.217
0.567
55


 


EX. 43




<3.8
0.497
0.836
135


 


EX. 2 This compound is the prodrug of EX 39




>300.0





 


EX. 1 This compound is a prodrug of an active compound described in WO02/064 551




>300.0





 


EX 3 This compound is a prodrug of EX 42




>300.0





 


EX 4 Prodrug




>300.0





 


EX 6 This compound is a prodrug of an active compound described in WO02/064 551




>300.0





 


EX 36




<3.8
0.267
0.503
204


 


EX 37




<3.8
0.224
0.683
60


 


EX 5 prodrug




91





 


EX 38





0.27
0.92
248


 


EX 18





0.26
0.6
136


 


EX 19





0.27
0.29
99


 


EX 13




9.2


2135


 


EX 14




75.7


1832


 


EX 15




<3.8
0.788
0.995
524


 


EX 16




<3.8

2.024
>50000


 


EX 17




<3.8
1.000 1.025
0.599
665


 


EX 31




<3.8

3.659
980


 


EX 32




<3.8
0.781
0.899
151


 


EX 34




<3.8
0.821
0.963
1000


 


EX 35




<3.8

3.011
>50000


 


EX 27




<3.8

2.55
369


 


EX 28





0.47




 


EX 29




<3.8

3.81
144


 


EX 30




<3.8

2.15
422


 


EX 20




<3.8

1.417
148


 


EX 21




<3.8

1.286
198


 


EX 22




<3.8

1.353
158


 


EX 23




<3.8

4.122
>50000


 


EX 63




<3.8

0.938
165


 


EX 24




5.3

5.212
>5000


 


EX 25




<3.8

2.876
>5000


 


EX 26




<3.8

3.314
>5000

## Claims

1. A compound of formula I



or a pharmaceutically acceptable salt thereof or a stereoisomer thereof,
wherein Cx is selected from the group consisting of COOH and CONR5R6,
wherein X and Y, the same or different, are selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, F, Cl, Br, I, —CF3, —CN, —NO2, —NR5R6, —NHCOR5, —OR5, —SR5, —COOR5, —COR5, and —CH2OH or X and Y together define an ethyleneoxy group of formula —OCH2CH2—, or —CH2CH2O—, or an alkylenedioxy group selected from the group consisting of a methylenedioxy group of formula —OCH2O—, and an ethylenedioxy group of formula —OCH2CH2O—,
wherein R1 is selected from the group consisting of a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, 2-pyridyl-CH2—, 3-pyridyl-CH2—, and 4-pyridyl-CH2—,
wherein R2 is selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, 2-pyridyl-CH2—, 3-pyridyl-CH2—, 4-pyridyl-CH2—,
a benzenesulfonyl group of formula




a thiophenesulfonyl group of formula




a group selected from the group of




a group of formula




a group selected from the group of formula




and a group of formula R2A—CO—, R2A being selected from the group consisting of a straight or branched alkyl group of 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a cycloalkylalkyl group having 3 to 6 carbon atoms in the cycloalkyl part thereof and 1 to 3 carbon atoms in the alkyl part thereof, an alkyloxy group of 1 to 6 carbon atoms, tetrahydro-3-furanyloxy, —CH2OH, —CF3, —CH2CF3, —CH2CH2CF3, piperonyl, pyrrolidinyl, piperidinyl, 4-morpholinyl, CH3O2C—, CH3O2CCH2—, Acetyl-OCH2CH2—, HO2CCH2—, 3-hydroxyphenyl, 4-hydroxyphenyl, 4-CH3OC6H4—CH2—, CH3NH—, (CH3)2N—, (CH3CH2)2N—, (CH2CH2CH2)2N—, HOCH2CH2NH—, CH3OCH2O—, CH3OCH2CH2O—, C6H5CH2O—, 2-pyrrolyl, 2-pyridyl(unsubstituted or substituted), 3-pyridyl(unsubstituted or substituted), 4-pyridyl-(unsubstituted or substituted), 2-pyrazinyl (unsubstituted or substituted with H, alkyl of 1 to 4 carbon atoms), 2-quinolyl, 3-quinolyl, 4-quinolyl, 1-isoquinolyl, 3-isoquinolyl, 2-quinoxalinyl,
a phenyl group of formula




a picolyl group selected from the group consisting of




a picolylamine group selected from the group




a picolyloxy group selected from the group consisting of




a substituted pyridyl group selected from the group consisting of




a group selected from the group consisting of




wherein X′ and Y′, the same or different, are selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, F, Cl, Br, I, —CF3, —NO2, —NR5R6, —NHCOR5, —OR5, —SR5, —COOR5, —COR5, —OCF3, —CN and —CH2OH,
wherein R4 is selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, and a cycloalkyl group of 3 to 6 carbon atoms,
wherein R5 and R6, the same or different, are selected from the group consisting of H, a straight alkyl group of 1 to 6 carbon atoms, a branched alkyl group of 3 to 6 carbon atoms, and a cycloalkyl group of 3 to 6 carbon atoms,
wherein R3 is selected from the group consisting of a diphenylmethyl group of formula IV




a naphthyl-1-CH2— group of formula V




a naphthyl-2-CH2— group of formula VI




a biphenylmethyl group of formula VII




and an anthryl-9-CH2— group of formula VIII

2. The compound of claim 1, wherein R3 is (C6H5)2CH—, 1-naphthyl-CH2— or 2-naphthyl-CH2—.

3. A compound of claim 1, wherein Cx is CONR5R6.

4. A compound of claim 3, wherein R5 and R6 are H.

5. A compound of the formula



or a pharmaceutically acceptable salt thereof.

6. A compound of the formula



or a pharmaceutically acceptable salt thereof.