INHIBITORS OF FARNESYL-PROTEIN TRANSFERASE

Abstract: The present invention is directed to compounds which inhibit farnesyl-protein transferase (FTase) and the farnesylation of the oncogene protein Ras. The invention is further directed to chemotherapeutic compositions containing the compounds of this invention and methods for inhibiting farnesyl-protein transferase and the farnesylation of the oncogene protein Ras.

Description: TITLE OF THE INVENTION INHIBITORS OF FARNESYL-PROTEIN TRANSFERASE CROSS REFERENCE This Application is a Continuation-In-Part Application of U.S. Serial No. 07/968,025 filed on October 29, 1992. BACKGROUND OF THE INVENTION The Ras gene is found activated in many human cancers, including colorectal carcinoma, exocrine pancreatic carcinoma, and myeloid leukemias. Biological and biochemical studies of Ras action indicate that Ras functions like a G-regulatory protein, since Ras must be localized in the plasma membrane and must bind with GTP in order to transform cells (Gibbs, J. et al., Microbiol. Rev. 53:171-286 (1989). Forms of Ras in cancer cells have mutations that distinguish the protein from Ras in normal cells. At least 3 post-translational modifications are involved with Ras membrane localization, and all 3 modifications occur at the C- terminus of Ras. The Ras C-terminus contains a sequence motif termed a "CAAX" or "Cys-Aaa 1 -Aaa 2 -Xaa" box (Aaa is an aliphatic amino acid, the Xaa is any amino acid) (Willumsen et al-, Nature 310:583-586 (1984)). Other proteins having this motif include the Ras-related GTP- binding proteins such as Rho, fungal mating factors, the nuclear lamins, and the gamma subunit of transducin. Farnesylation of Ras by the isoprenoid farnesyl pyrophosphate (FPP) occurs m vivo on Cys to form a thioether linkage (Hancock et al., Cell 57:1167 (1989); Casev et al. Proc. Natl. Acad. Sci. USA 86:8323 (1989)). In addition, Ha-Ras and N-Ras are palmitoylated via formation of a thioester on a Cys residue near a C-terminal Cys farnesyl acceptor (Gutierrez et aL, EMBO J. 8:1093-1098 (1989); Hancock et al., Cell 57: 1167-1177 (1989)). Ki-Ras lacks the palmitate acceptor Cys. The last 3 amino acids at the Ras C-terminal end are removed proteolytically, and methyl esterification occurs at the new C- terminus (Hancock et aL, ibid). Fungal mating factor and mammalian nuclear lamins undergo identical modification steps (Anderegg et aL, J.Biol. Chem. 263:18236 (1988); Famsworth et al-, J. Biol. Chem. 264:20422 (1989)). Inhibition of Ras farnesylation in vivo has been demonstrated with lovastatin (Merck & Co., Rahway, NJ) and compactin (Hancock et aL, ibid: Casey et aL, ibid: Schafer et al., Science 245:379 (1989)). These drugs inhibit HMG-CoA reductase, the rate- limiting enzyme for the production of polyisoprenoids and the farnesyl pyrophosphate precursor. It has been shown that a farnesyl-protein transferase using farnesyl pyrophosphate as a precursor is responsible for Ras farnesylation. (Reiss et aL, Cell, 62: 81-88 (1990); Schaber et al.. J. Biol. Chem.. 265:14701-14704 (1990); Schafer et al.. Science. 249: 1133-1139 (1990); Manne et al.. Proc. Natl. Acad. Sci USA. 87: 7541-7545 (1990)). Inhibition of farnesyl-protein transferase and, thereby, of farnesylation of the Ras protein, blocks the ability of Ras to transform normal cells to cancer cells. The compounds of the invention inhibit Ras farnesylation and, thereby, generate soluble Ras which, as indicated infra, can act as a dominant negative inhibitor of Ras function. While soluble Ras in cancer cells can become a dominant negative inhibitor, soluble Ras in normal cells would not be an inhibitor. A cytosol-localized (no Cys-Aaa^-Aaa^-Xaa box membrane domain present) and activated (impaired GTPase activity, staying bound to GTP) form of Ras acts as a dominant negative Ras inhibitor of membrane-bound Ras function (Gibbs et aL, Proc. Natl. Acad. Sci. USA 86:6630-6634(1989)). Cytosollocalized forms of Ras with normal GTPase activity do not act as inhibitors. Gibbs et aL, ibid, showed this effect in Xenopus oocytes and in mammalian cells. Administration of compounds of the invention to block Ras farnesylation not only decreases the amount of Ras in the membrane but also generates a cytosolic pool of Ras. In tumor cells having activated Ras, the cytosolic pool acts as another antagonist of membrane-bound Ras function. In normal cells having normal Ras, the cytosolic poo! of Ras does not act as an antagonist. In the absence of complete inhibition of farnesylation, other farnesylated proteins are able to continue with their functions. Farnesyl-protein transferase activity may be reduced or completely inhibited by adjusting the compound dose. Reduction of farnesyl-protein transferase enzyme activity by adjusting the compound dose would be useful for avoiding possible undesirable side effects resulting from interference with other metabolic processes which utilize the enzyme. These compounds and their analogs are inhibitors of farnesyl-protein transferase. Farnesyl-protein transferase utilizes farnesyl pyrophosphate to covalently modify the Cys thiol group of the Ras CAAX box with a farnesyl group. Inhibition of farnesyl pyrophosphate biosynthesis by inhibiting HMG-CoA reductase blocks Ras membrane localization in vivo and inhibits Ras function. Inhibition of farnesyl-protein transferase is more specific and is attended by fewer side effects than is the case for a general inhibitor of isoprene biosynthesis. Previously, it has been demonstrated that tetrapeptides containing cysteine as an amino terminal residue within the CAAX sequence inhibit Ras farnesylation (Schaber et aL, ibid: Reiss et. al.. ibid: Reiss et al-, PNAS. 88:732-736 (1991)). Such inhibitors may inhibit while serving as alternate substrates for the Ras farnesyl- transferase enzyme, or may be purely competitive inhibitors (U.S. Patent 5,141,851 University of Texas). The compounds of the present invention are tetrapeptide- based oxa, thia, oxothia or dioxothia isosteres of the general structure C-[yCH2NH]Xaal[yCH2T]Xaa2-Xaa3 wherein C is cysteine, Xaa 1-3 is any amino acid, T is either oxygen or S(0)m and m is 0, 1 or 2. Reduction of the amide linkages between C and Xaal and between Xaal and Xaa2, and replacement of the amino group between Xaal and Xaa2 by T as shown confers both chemical and metabolic stability to the compounds of this invention and thereby enhances their activity in vivo (cell culture). The noted structural modifications may also lead to an unexpected improvement of intrinsic enzyme -inhibitory activity. Furthermore, of particular utility is the observation that the lactone or ester forms of these inhibitors are prodrugs that efficiently deliver the active hydroxy acids or acids, respectively, to the intracellular compartment that is the site of Ras farnesylation. It is, therefore, an object of this invention to develop tetrapeptide-based compounds wherein the first amide linkage is reduced and the second amide linkage is replaced by methyleneoxa, methylenethia, methyleneoxothia or methylenedioxothia linkages, and which will inhibit farnesyl-protein transferase and the farnesylation of the oncogene protein Ras. It is a further object of this invention to develop chemotherapeutic compositions containing the compounds of this invention, and methods for producing the compounds of this invention. SUMMARY OF THE INVENTION The present invention includes compounds which are tetrapeptide-based oxa, thia, oxothia and dioxothia isosteres and which inhibit farnesyl-protein transferase and the farnesylation of the oncogene protein Ras, chemotherapeutic compositions containing the compounds of this invention, and methods for producing the compounds of this invention. The compounds of this invention are illustrated by the formulae: IV DETAILED DESCRIPTION OF THE INVENTION The compounds of this invention are useful in the inhibition of farnesyl-protein transferase and the farnesylation of the oncogene protein Ras. In a first embodiment of this invention, the inhibitors of farnesyl-protein transferase are illustrated by the formula I: wherein: Rl is hydrogen, an alkyl group, an aralkyl group, an acyl group, an aracyl group, an aroyl group, an alkylsulfonyl group, aralkylsulfonyl group or arylsulfonyl group, wherein alkyl and acyl groups comprise straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; R2 and R3 are the side chains of naturally occurring amino acids, including their oxidized forms which may be methionine sulfoxide or methionine sulfone, or in the alternative may be substituted or unsubstituted aliphatic, aromatic or heteroaromatic groups, such as allyl, cyclohexyl, phenyl, pyridyl, imidazolyl or saturated chains of 2 to 8 carbon atoms which may be branched or unbranched, wherein the aliphatic substituents may be substituted with an aromatic or heteroaromatic ring; R4 is hydrogen or an alkyl group, wherein the alkyl group comprises straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; T is O or S(0) m ; m and n are independently 0, 1 or 2; or the pharmaceutically acceptable salts thereof. In a second embodiment of this invention, the prodrugs of compounds of formula I are illustrated by the formula II: wherein: Rl is hydrogen, an alkyl group, an aralkyl group, an acyl group, an aracyl group, an aroyl group, an alkylsulfonyl group, aralkylsulfonyl group or arylsulfonyl group, wherein alkyl and acyl groups comprise straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; R2 and R3 are the side chains of naturally occurring amino acids, including their oxidized forms which may be methionine sulfoxide or methionine sulfone, or in the alternative may be substituted or unsubstituted aliphatic, aromatic or heteroaromatic groups, such as allyl, cyclohexyl, phenyl, pyridyl, imidazolyl or saturated chains of 2 to 8 carbon atoms which may be branched or unbranched, wherein the aliphatic substituents may be substituted with an aromatic or heteroaromatic ring; R4 is hydrogen or an alkyl group, wherein the alkyl group comprises straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; T is O or S(0) m ; m and n are independently 0, 1 or 2; or the pharmaceutically acceptable salts and disulfides thereof. In a third embodiment of this invention, the inhibitors of farnesyl-protein transferase are illustrated by the formula HI: wherein: Rl is hydrogen, an alkyl group, an aralkyl group, an acyl group, an aracyl group, an aroyl group, an alkylsulfonyl group, aralkylsulfonyl group or arylsulfonyl group, wherein alkyl and acyl groups comprise straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; R2, R3 and R5 are the side chains of naturally occurring amino acids, including their oxidized forms which may be methionine sulfoxide or methionine sulfone, or in the alternative may be substituted or unsubstituted aliphatic, aromatic or heteroaromatic groups, such as allyl, cyclohexyl, phenyl, pyridyl, imidazolyl or saturated chains of 2 to 8 carbon atoms which may be branched or unbranched, wherein the aliphatic substituents may be substituted with an aromatic or heteroaromatic ring; R4 is hydrogen or an alkyl group, wherein the alkyl group comprises straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; T is O or S(0) m ; m is 0, 1 or 2;. or the pharmaceutically acceptable salts thereof. In a fourth embodiment of this invention, the prodrugs of compounds of formula HI are illustrated by the formula IV: IV wherein, Rl is hydrogen, an alkyl group, an aralkyl group, an acyl group, an aracyl group, an aroyl group, an alkylsulfonyl group, aralkylsulfonyl group or arylsulfonyl group, wherein alkyl and acyl groups comprise straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; R2, R3 and R5 are the side chains of naturally occurring amino acids, including their oxidized forms which may be methionine sulfoxide or methionine sulfone, or in the alternative may be substituted or unsubstituted aliphatic, aromatic or heteroaromatic groups, such as allyl, cyclohexyl, phenyl, pyridyl, imidazolyl or saturated chains of 2 to 8 carbon atoms which may be branched or unbranched, wherein the aliphatic substituents may be substituted with an aromatic or heteroaromatic ring; R4 is hydrogen or an alkyl group, wherein the alkyl group comprises straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; R6 is a substituted or unsubstituted aliphatic, aromatic or heteroaromatic group such as saturated chains of 1 to 8 carbon atoms, which may be branched or unbranched, wherein the aliphatic substituent may be substituted with an aromatic or heteroaromatic ring; T is O or S(0) m ; m is 0, 1 or 2; or the phaimaceutically acceptable salts and disulfides thereof. The preferred compounds of this invention are as follows: 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-2-methyl-3-phenylpropionyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-2-methyl-3-phenylpropionyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]ρropylamino-3(S)-methyl]- pentyloxy-4-pentenoyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-4-pentenoyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]ρropylamino-3(S)-methyl]- pentyloxypentanoyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxypentanoyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-4-methylpentanoyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-4-methylpentanoyl-homoserine, ° 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-methylbutanoyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-methylbutanoyl-homoserine, 5 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylbutanoyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- ° pentyloxy-3-phenylbutanoyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentylrhio-2-methyl-3-phenylpropionyl-homoserine lactone, 5 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentylthio-2-methyl-3-phenylpropionyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentylsulfonyl-2-methyl-3-phenylpropionyl-homoserine lactone, 0 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentylsulfonyl-2-methyl-3-phenylpropionyl-homosεrine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine methyl ester, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine sulfone methyl ester, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine sulfone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3 -pheny lpropionyl-methionine sulfone isopropyl ester, 2-(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-naphth-2-yl-propionyl-methionine sulfone methyl ester, 2-(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-naphth-2-yl-propionyl-methionine sulfone, 2-(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-naphth-l-yl-propionyl-methionine sulfone methyl ester, 2-(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-naphth-l -yl-propionyl-methionine sulfone, 2-(S)-[2(S)-f2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-methybutanoyl-methionine methyl ester, 2-(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-methybutanoyl-methionine, Disulphide of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine lactone, Disulphide of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine, Disulphide of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)- methyl]pentyloxy-3-methylbutanoyl-methionine methyl ester. or the pharmaceutically acceptable salts thereof. The most preferred compounds of this invention include the following inhibitor and the corresponding lactone/ester prodrug pairs: 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-homoserine 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-homoserine lactone 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl -methionine methyl ester 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine sulfone 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine sulfone methyl ester 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine sulfone isopropyl ester or the pharmaceutically acceptable salts thereof. As used herein, "alkyl" is intended to include both branched and straight-chain saturated aliphatic hydrocarbon groups having the specified number of carbon atoms. The pharmaceutically acceptable salts of the compounds of this invention include the conventional non-toxic salts of the compounds of this invention as formed, e.g., from non-toxic inorganic or organic acids. For example, such conventional non-toxic salts include those derived from inorganic acids such as hydrochloric, hydrobromic, sulfuric, sulfamic, phosphoric, nitric and the like: and the salts prepared from organic acids such as acetic, propionic, succinic, glycolic, stearic, lactic, malic, tartaric, citric, ascorbic, pamoic, maleic, hydroxymaleic, phenylacetic, glutamic, benzoic, salicylic, sulfanilic, 2-acetoxy-benzoic, fumaric, toluenesulfonic, methanesulfonic, ethane disulfonic, oxalic, isethionic, trifluoroacetic and the like. The pharmaceutically acceptable salts of the compounds of this invention can be synthesized from the compounds of this invention which contain a basic moiety by conventional chemical methods. Generally, the salts are prepared by reacting the free base with stoichiometric amounts or with an excess of the desired salt-forming inorganic or organic acid in a suitable solvent or various combinations of solvents. The compounds of the invention can be synthesized from their constituent amino acids by conventional peptide synthesis techniques, and the additional methods described below. Standard methods of peptide synthesis are disclosed, for example, in the following works: Schroeder et aL, "The Peptides", Vol. I, Academic Press 1965, or Bodanszky et aL, "Peptide Synthesis", Interscience Publishers, 1966, or McOmie (ed.) "Protective Groups in Organic Chemistry", Plenum Press, 1973, or Barany et aL, "The Peptides: Analysis, Synthesis, Biology" 2, Chapter 1, Academic Press, 1980, or Stewart et aL, "Solid Phase Peptide Synthesis", Second Edition, Pierce Chemical Company, 1984. The teachings of these works are hereby incorporated by reference. Abbreviations used in the description of the chemistry and in the Examples that follow are: The oxa isostere compounds of this invention are prepared according to the route outlined in Scheme I. An aminoalcohol 1 is acylated with α-chloroacetyl chloride in the presence of trialkylamines to yield amide 2. Subsequent reaction of 2 with a deprotonation reagent (e.g., sodium hydride or potassium t-butoxide) in an ethereal solvent such as THF provides morpholinone 3. The N-Boc derivative 4 is then obtained by the treatment of 3. with BOC anhydride and DMAP (4- dimethylamino-pyridine) in methylene chloride. Alkylation of 4 with R3χ, where X is a leaving group such as Br, I- or Cl- in THF/DME (1,2-dimethoxyethane) in the presence of a suitable base, preferably NaHMDS [sodium bis(trimethylsilyl)amide], affords 5, which is retreated with NaHMDS followed by either protonation or the addition of an alkyl halide R4χ to give 6a or 6b, respectively. Alternatively, 6a can be prepared from 4 via an aldol condensation approach. Namely, deprotonation of 4 with NaHMDS followed by the addition of a carbonyl compound R7R8CO gives the adduct 7. Dehydration of 7 can be effected by mesylation and subsequent elimination catalyzed by DBU (1 ,8-diazabicyclo[5.4.0]undec-7-ene) or the direct treatment of 7 with phosphorus oxy-chloride in pyridine to give olefin _%. Then, catalytic hydrogenation of 8 yields 6a. Direct hydrolysis of 6 with lithium hydrogen peroxide in aqueous THF will produce acid 9b. Sometimes, it is more efficient to carry out this conversion via a 2-step sequence, namely, hydrolysis of 6 in hydrochloric acid to afford 9a, which is then derivatized with BOC-ON or BOC anhydride to give 9b. The peptide coupling of acid 9b with either an -aminolactone (e.g., homoserine lactone, etc.) or the ester of an amino acid is carried out under the conditions exemplified in the previously described references to yield derivative 10. Treatment of J_0 with gaseous hydrogen chloride gives 1 1. which undergoes reductive alkylation in the presence of aldehyde 12 using sodium cyanoborohydride or similar reducing agents to afford 13. Finally, deprotection of 13 in TFA in the presence of triethylsilane leads to the product 14- Hydrolysis of compounds j_4 to the corresponding hydroxy acids and acids, respectively, is accomplished by standard methods such as treatment with NaOH in alcoholic or aqueous milieux followed by careful acidification with dilute HCL SCHEME I 2 SCHEME I (CONT'D) a a, R 9 =H b, R 9 =BOC 10 15 20 11 A = 30 SCHEME I (CONT'D ^ ) The thia, oxothia and dioxothia isostere compounds of this invention are prepared in accordance to the route depicted in Scheme II. Aminoalcohol 1 is derivatized with BOC20 to give 15. Mesylation of 15 followed by reaction with methyl a-mercaptoacetate in the presence of cesium carbonate gives sulfide 16. Removal of the BOC group in J 6 with TFA followed by neutralization with di-isopropylethylamine leads to lactam J 7. N-BOC derivative j_8 is obtained via the reaction of ___!_ with BOC anhydride in THF catalyzed by DMAP. Sequential alkylation of 18 with the alkyl halides R3χ and R4χ in THF/DME using NaHDMS as the deprotonation reagent produces 19. Hydrolysis of 19 in hydrochloride to yield 20a, which is derivatized with Boc anhydride to yield 20b. The coupling of 20b with an a-aminolactone (e.g., homoserine lactone, etc.) or the ester of an amino acid is carried out under conventional conditions as exemplified in the previously described references to afford 2L Sulfide 2\_ is readily oxidized to sulfone 22 by the use of MCPBA (m-chloroperoxybenzoic acid). The N-BOC group of either 2i or 22 is readily removed by treatment with gaseous hydrogen chloride. The resultant amine hydrochloride 23 undergoes reductive alkylation in the presence of aldehyde 12 using sodium cyanoborohydride or similar reducing agents to yield 24. Finally, deprotection of 24 in TFA in the presence of triethylsilane provides the product 25, which is hydrolyzed to the corresponding hydroxy acid or acid as described for 14. The compounds of this invention inhibit farnesyl-protein transferase and the farnesylation of the oncogene protein Ras. These compounds are useful as pharmaceutical agents for mammals, especially for humans. These compounds may be administered to patients for use in the treatment of cancer. Examples of the type of cancer which may be treated with the compounds of this invention include, but are not limited to, colorectal carcinoma, exocrine pancreatic carcinoma, and myeloid leukemias. The compounds of this invention may be administered to mammals, preferably humans, either alone or, preferably, in combination with pharmaceutically acceptable carriers or diluents, optionally with known adjuvants, such as alum, in a pharmaceutical composition, according to standard pharmaceutical practice. The compounds can be administered orally or parenterally, including the intravenous, intramuscular, intraperitoneal, subcutaneous, rectal and topical routes of administration. SCHEME π 13. 11 18 Base 19 SCHEME π (CONT'D) m = 0, 20 \ MCPBA m = 2, 22 J 23 m = 0 or 2 SCHEME π (CONT'D) m = 0 or 2 For oral use of a chemotherapeutic compound according to this invention, the selected compound may be administered, for example, in the form of tablets or capsules, or as an aqueous solution or suspension. In the case of tablets for oral use, carriers which are commonly used include lactose and corn starch, and lubricating agents, such as magnesium stearate, are commonly added. For oral administration in capsule form, useful diluents include lactose and dried com starch. When aqueous suspensions are required for oral use, the active ingredient is combined with emulsifying and suspending agents. If desired, certain sweetening and/or flavoring agents may be added. For intramuscular, intraperitoneal, subcutaneous and intravenous use, sterile solutions of the active ingredient are usually prepared, and the pH of the solutions should be suitably adjusted and buffered. For intravenous use, the total concentration of solutes should be controlled in order to render the preparation isotonic. The present invention also encompasses a pharmaceutical composition useful in the treatment of cancer, comprising the administration of a therapeutically effective amount of the compounds of this invention, with or without pharmaceutically acceptable carriers or diluents. Suitable compositions of this invention include aqueous solutions comprising compounds of this invention and pharmacologic¬ ally acceptable carriers, e.g. saline, at a pH level, e.g., 7.4. The solutions may be introduced into a patient's intramuscular blood-stream by local bolus injection. When a compound according to this invention is administered into a human subject, the daily dosage will normally be determined by the prescribing physician with the dosage generally varying according to the age, weight, and response of the individual patient, as well as the severity of the patient's symptoms. In one exemplary application, a suitable amount of compound is administered to a human patient undergoing treatment for cancer. Administration occurs in an amount between about 0.1 mg/kg of body weight to about 20 mg/kg of body weight per day, preferably of between 0.5 mg/kg of body weight to about 10 mg/kg of body weight per day. EXAMPLES Examples provided are intended to assist in a further understanding of the invention. Particular materials employed, species and conditions are intended to be further illustrative of the invention and not limitative of the reasonable scope thereof. EXAMPLE 1 Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-propylamino-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine lactone and 2(S)- [2(S)-[2(R)-Amino-3-mercapto]-propylamino-3(S)-methyl]pentyloxy-3- phenyl-propionyl-homoserine Step A: Preparation of N-(oc-chloroacetyl)-L-isoleucinol To a stirred solution of L-isoleucinol (20 g, 0.17 mol) and triethylamine (28.56 ml, 0.204 mol) in CH2CI2 (500 ml) at -78°C was added chloroacetyl chloride (16.3 ml, 0.204 mol) over 5 minutes. The cooling bath was removed and the solution allowed to warm to -20°C. The mixture was diluted with EtOAc and washed sequentially with 1 M HCI, and brine and dried (Na2S04). Evaporation in vacuo afforded the amide title compound (35 g, 100%). Rf = 0.3 CH2CI2: MeOH (95:5); lH NMR (CDC13) δ 6.80 (1H, brd, J = 5 Hz), 4.10 (2H, s), 3.84 (1H, m), 3.79 (2H, m), 2.65 (1H, brs), 1.72 (1H, m), 1.55 (1H, m), 1.17 (1H, m), 0.96 (3H, d, J = 6Hz) 0.90 (3H,t, J=6 Hz). Step B: Preparation of 5(S)-[l(S)-methyl]proρyl-2,3,5,6-tetra- hydro-4H-l .4-oxazin-3-one To a stirred solution of N-(a-chloroacetyl)-L-isoleucinol (7.4 g, 0.038 mol) in THF (125 ml) under argon at 0°C was slowly added sodium hydride (2.2 g of a 60% dispersion in mineral oil, 0.055 mol) with concomitant gas evolution. After completing the addition, the mixture was warmed to room temperature (R.T.) and stirred for 16 hr. Water (2.8 ml) was added and the solvents evaporated in vacuo. The residue was dissolved in CHCI3 (70 ml) and washed with water saturated NaCI solution. The organic layer was dried (Na2S04) and evaporated in vacuo. The residue was chromatographed using silica gel eluting with CH2Cl2:MeOH (96:4) to afford the lactam title compound (4.35 g, 72%) as a white solid. Rf = 0.35 CH2Cl2:MeOH (95:5); 1H NMR δ (CDC13) 6.72 (IH, brs), 4.20 (IH, d, J = 14.5 Hz), 4.10 (IH, d, J = 14.5 Hz), 3.88 (IH, dd, J = 9 and 3.5 Hz), 3.58 (IH, dd, J = 9 and 6.5 Hz), 3.45 (IH, brqt, J = 3.5 Hz), 1.70-1.45 (2H, m), 1.34 - 1.15 (IH, m), 0.96 (3H, t, J = 6.5 Hz), 0.94 (3H, d, J = 6.5 Hz). Step C: Preparation of N-(tert-butoxycarbonyl)-5(S)-[l(S)- methyllpropyl-2.3.5.6-tetrahvdro-4H-1.4-oxazin-3-one 5(S)-[ 1 (S)-Methyl]propyl-2,3,5,6-tetrahydro 4H- 1 ,4- oxazin-3-one (12.2 g, 0.0776 mol) and DMAP (18.9 g, 0.155 mol) were dissolved in methylene chloride (120 ml) under argon at R.T. Boc anhydride (33.9 g, 0.155 mol) was added to the stirred solution in one portion, with concomitant gas evolution and the mixture was stirred at R.T. for 16 hr. The solvent was evaporated in vacuo and the residue was taken up in ethyl acetate and washed sequentially with 10% citric acid, 50% NaHCθ3 and finally brine. The organic extract was dried (Na2S04) and evaporated in vacuo. Chromatography of the residue over silica gel eluting with 20% EtOAc in hexanes afforded the title compound (14.1 g, 71 %) as a white solid. Rf = 0.75 EtOAc exanes (20:80); mp 59-60°C Anal. Calc'd. for C13H23 4N : C, 60.68; H,9.01; N, 5.44. Found: C, 60.75; H, 9.01; N, 5.58. IH NMR (CDCI3) δ 4.25 (IH, d, J = 15 Hz), 4.15 (IH, d, J = 15 Hz), 4.15 - 4.00 (2H, m), 3.73 (IH, dd, J = 10 and 2 Hz), 1.88 (IH, qt, J = 6 Hz), 1.55 (9H, s), 1.50 - 1.36 (IH, m), 1.35 - 1.19 (IH, m) 1.00 (3H, d, J = 6 Hz) 0.95 (3H, d, J = 6.5 Hz). Step D: Preparation of N-(tert-Butoxycarbonyl)-2(S)-benzyl-5(S)- [l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H-l ,4-oxazin-3- one A solution of N-(tert-butoxycarbonyl)-5(S)-[l(S)- methyl]propyl-2,3,5,6-tetrahydro-4H-l,4-oxazin-3-one (5.75 g, 22.34 mmol) in DME (100 ml) under argon was cooled to -60°C. The cold solution was transferred via canula to a second flask containing sodium bis(trimethylsilyl)amide (24.58 ml of a 1M solution in THF, 24.58 mmol) at -78°C under argon. After stirring for 10 minutes, benzyl bromide (2.25 ml, 18.99 mmol) was added over 5 minutes and the resulting mixture was stirred at -78 °C for 3 hours. After this time, the reaction mixture was transferred via cannula to another flask containing sodium bis(trimethylsilyl)amide (24.58 ml of a 1M solution in THF, 24.58 mmol) at -78°C, under argon. After stirring for a further 5 minutes, the reaction was quenched by the addition of saturated aqueous ammonium chloride solution (24.6 ml) and allowed to warm to room temperature. This mixture was diluted with brine (50 ml) and water (20 ml) and then extracted with ethyl acetate (2 x 100 ml). The organic extracts were washed with brine (50 ml) and evaporated in vacuo to afford an oil. Chromatography of the residue over silica gel (230-400 mesh, 300 g) eluting with 10-20% ethyl acetate in hexanes afforded the title compound (5.12 g, 67%) as a clear oil. Rf = 0.25 EtOAc:Hexanes (20:80); IH NMR (CDC13) δ 7.35 - 7.15 (5H, m), 4.31 (IH, dd, J = 6 and 2 Hz), 4.03 (IH, d, J = 12 Hz), 3.88 (IH, dd, J = 6 and 1 Hz), 3.66 (IH, dd, J = 12 and 2 Hz), 3.29 (IH, dd, J = 12 and 3 Hz), 1.54 (9H, s), 3.12 (IH, dd, J = 12 and 7 Hz), 1.47 (IH, m), 1.25 (IH, m), 1.10 (IH, m), 0.83 (3H, d, J = 6 Hz), 0.80 (3H, t, J = 6 Hz). Step E: Preparation of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino- 3(S)-methyllpentyloxy-3-phenyl-propionic acid To a stirred solution of N-(tert-butoxycarbonyl)-2(S)- benzyl-5(S)-[l(S)-methyl]-propyl-2,3,5,6-tetrahydro-4H-l,4-oxazin-3- one (5.1 g, 14.7 mmol) in THF (150 ml) and water (50 ml) at 0°C was added hydrogen peroxide (15 ml of a 30% aqueous solution, 132 mmol) and lithium hydroxide (3.0 g, 63.9 mmol). After stirring for 30 minutes, the reaction was quenched with a solution of sodium sulfite (28.25 g, 0.224 mol) in water (70 ml). The THF was evaporated in vacuo and the aqueous phase was acidified to pH 3-4 by addition of 10% citric acid solution and extracted with EtOAc. The organic extracts were dried (Na2Sθ4), evaporated in vacuo and the residue purified by chromatography over silica gel eluting with 4% MeOH in CH2CI2 to give the lactam 2(S)-benzyl-5(S)-[l(S)-methyl]propyl-2,3,5,6- tetrahydro-4H-l,4-oxazin-3-one (0.82 g 22%) and then with 20% MeOH in CH2CI2 to afford the title compound (4.03 g, 75%) as a viscous oil. Rf = 0.4 MeOH:CH2Cl2 (5:95) + 0.3% AcOH; IH NMR (d6 DMSO) δ 7.35 - 7.10 (5H, m), 6.68 (IH, br, s), 3.75 (IH, dd, J = 7.5 and 2.5 Hz) 3.54 (IH, m), 3.5 - 3.2 (2H, m) 2.99 (IH, dd, J = 12.5 and 2.5 Hz), 2.75 (IH, dd, J = 12.5 and 7.5 Hz), 1.50 - 1.35 (1 IH, m), 0.98 (IH, sept, J = 6 Hz), 0.78 (3H, t, J = 6 Hz), 0.65 (3H, d, J = 6 Hz); FAB MS 366 (MH+) 266 (MH2+ - Cθ2tBu). Step F: Preparation of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino- 3 (S)-methyl] -pentyloxy-3 -phenyl -propionyl-homoserine lactone To a stirred solution of N-(tert-butoxycarbonyl)-2(S)- [2(S)-amino-3(S)-methyl]-pentyloxy-3-phenylpropionic acid (0.53 g, 1.45 mmol) and 3-hydroxy-l,2,3,-benzotriazin-4(3H)-one (HOOBT) (0.26 g, 1.6 mmol) in DMF (15 ml) at room temperature was added EDC (0.307 g, 1.6 mmol) and L-homoserine lactone hydrochloride (0.219 g, 6.0 mmol). The pH was adjusted to pH= 6.5 by addition of NEt3 (the pH was monitored by application of an aliquot of the reaction mixture to a moist strip of pH paper). After stirring at room temperature for 16 hr, the reaction was diluted with EtOAc and washed with saturated NaHCθ3 and then brine and dried (NaS04). Evaporation in vacuo (sufficient to remove DMF) and chromatography over silica gel eluting with 5% acetone in CH2CI2 afforded the title compound (520 mg, 80%) as a white solid, mp 115-117°C. Rf = 0.3 Acetone: CH2CI2 (5:95). IH NMR (CDCI3) δ 7.73 (IH, brd, J=5 Hz), 7.40-7.15 (5H, m), 4.68 (IH, dt, J=9 and 7.5 Hz), 4.65-4.35 (2H, m), 4.33-4.18 (IH, m), 4.20 (IH, dd, J=7 and 3 Hz), 3.78 (IH, m), 3.49 (IH, dd, J=7.5 and 4.0 Hz), 3.37 (IH, dd, J=7.5 and 6.5 Hz), 3.15 (IH, dd, J=11.5 and 2 Hz), 2.86 (IH, dd, J=l 1.5 and 7.5 Hz), 2.68 (IH, m) 2.1 1 (IH, q, J=9 Hz), 1.55- 1.30 (11H, m), 1.07 (IH, m), 0.87 (3H, t, J=6.3 Hz), 0.79 (3H, d, J=6 Hz). Step G: Preparation of 2(S)-[2(S)-amino-3(S)-methyl]-pentyloxy-3- phenylpropionyl-homoserine lactone hydrochloride Anhydrous HCI gas was bubbled through a cold (0°C) solution of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine lactone (3.0 g, 6.7 mmol) in ethyl acetate (120 ml) until a saturated solution was obtained. The resulting mixture was stirred at 0°C for 1 hr. The solution was purged with nitrogen and the mixture concentrated in vacuo to afford the title compound as a sticky foam which was used without further purification. IH NMR (d6 DMSO) δ 8.60 (IH, d, J=7 Hz), 8.08 (3H, brs), 7.35-7.15 (5H, m), 4.60 (IH, qt, J=8 Hz), 4.36 (IH, t J=7.5 Hz), 4.22 (IH, q, J=7.5 Hz), 4.15-3.95 (2H, m), 3.64 (IH, dd, J=9 and 2.5 Hz), 3.15-3.00 (2H, m), 2.92 (IH, dd, J=12.5 and 5.0 Hz), 2.40-2.15 (2H, m), 1.65 (IH, m), 1.43 (IH, m), 1.07 (IH, m), 0.82 (3H, t, J=6 Hz), 0.72 (3H, d, J=6.0 Hz). Step H: Preparation of 2(S)-[2(S)-[2(R)-(tert-butoxycarbonyl)- amino-3-triphenylmemylmercap-to]propylamino-3(S)- methyll-pentyloxy-3-phenylpropionyl-homoserine lactone 2(S)-[2(S)-Amino-3(S)-methyl]pentyloxy-3-phenyl- propionyl-homoserine hydrochloride (6.7 mmol) and N-(tert-butoxy- carbonyl)-S-triphenylmethylcysteine aldehyde (0.74 g, 7.5 mmol) (prepared from N-(tert-butoxycarbonyl)-S-triphenylmethylcysteine by the procedure of Goel, O.P.; Krolls, U.; Stier, M.; Keston, S. Org. Svn. 1988, 67, 69.) and potassium acetate (3.66 g, 8.2 mmol) were dissolved in methanol (48 ml). Activated 4A molecular sieves (6g) and then Na(CN)BH3 (0.70 g, 10.7 mmol) were added and the resulting slurry was stirred under argon at room temperature for 16 hr. The solids were removed by filtration and the filtrate evaporated in vacuo. The residue was dissolved in EtOAc and washed sequentially with saturated aqueous NaHC03 and brine and then dried (Na2S04). Evaporation in vacuo afforded an oil which was purified by chromatography over silica gel eluting with a gradient of 30-50% EtOAc in hexane to afford the title compound (2.34 g, 45%) contaminated with a small amount of the corresponding methyl ester. IH NMR (CD3OD) δ 7.60-7.05(20H, m), 4.64 (IH, d, J=9.0Hz), 4.39 (IH, br t, J=9Hz), 4.25(1H, m), 3.93 (IH, m), 3.75-3.60(lH, m), 3.55 (IH, dd, J=9.0 and 2Hz), 3.20 (IH, dd, J=9.0 and 6.0 Hz), 3.04 (IH, dd, J=15.0 and 5.0 Hz), 2.85 (IH, dd, J=15.0 and 9.0 Hz), 2.60 (IH, dd, J=12.0 and 5.0 Hz), 2.50-2.15 (7H, m), 1.45 (9H, s), 1.40-1.20 (IH, m), 1.07 (IH, m), 0.87 (3H, t, J=6 Hz), 0.67 (3H, d, J=6.0 Hz). Step I: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-phenylpropionyl- homoserine lactone To a stirred solution of 2(S)-[2(S)-[2(R)-(tert-butoxy- carbonyl)amino-3-triphenylmethylmercapto]-propylamino-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine lactone (2.72 g, 3.49 mmol) in CH2CI2 (90 ml) was added HSiEt3 (2.16 ml, 13.5 mmol) and TFA (43.2 ml, 0.56 mol) and the solution was stirred at R.T. under argon for 2 hrs. The solvent was evaporated in vacuo and the residue partitioned between 0.1% aqueous TFA (200 ml) and hexanes (100 ml). The aqueous layer was separated and washed with hexanes (20 ml) and then lyophilised. The resulting white lyophilate was chromatographed in 5 equal portions over a Waters Prepak cartridge (C-18, 15-20 mM 100 A) eluting with a gradient of 95:5 to 5:95 0.1% TFA in H2O : 0.1% TFA in CH3CN at 100 ml/min over 60 min. The desired compound eluted after 19 min. The CH3CN was evaporated in vacuo and the aqueous solution lyophilised to afford the title compound (1.95 g, 77%) as the TFA salt. The salt is hygroscopic and is prone to disulphide formation if left in solution and exposed to air. IH NMR δ (CD3OD) 7.40-7.15 (5H,m), 4.55-5.40 (2H, m), 4.33 (IH, m), 4.18 (IH, m), 3.90-3.62 <3H, m), 3.53 (IH, dd, J=10.5 and 4.0 Hz), 3.37 (IH, dd, J=10.5 and 6.0 Hz), 3.23 (IH, m), 3.15-2.95 (2H, m), 2.88 (IH, dd, J=12.5 and 5.0 Hz), 2.55-2.25 (2H, m), 1.92 (IH, m), 1.49 (IH, m), 1.23 (IH, m), 0.94 (3H, t, J=6 Hz), 0.90 (3H, d, J=6Hz). FAB MS 873 (2M-H+) 438 (MH+) 361 (MH±Ph) Anal, calc'd for C22H36O4N3S 2.6 TFA:C, 43.58; H, 5.25; N, 5,82. Found: C, 43.62; H, 5.07; N, 5.80. Step J: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-phenylpropionyl- homoserine 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl-amino-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine lactone (0.00326 mmol) was dissolved in methanol (0.0506 ml) and IN sodium hydroxide (0.0134 ml) was added followed by methanol (0.262 ml). The conversion of the lactone to the hydroxy-acid was confirmed by HPLC analysis and NMR. EXAMPLE 2 Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-propylamino-3(S)- methyl]-pentyloxy-2-methyl-3-phenyl-propionyl-homoserine lactone and 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-2-methyl-3-phenyl-propionyl-homoserine Step A: Preparation of N-(tert-butoxycarbonyl)-2(S)-benzyl-2- methyl-5(S)-[l(S)-methyl]-propyl-2,3,5,6-tetrahydro-4H- 1.4-oxazin-3-one A solution of N-(tert-butoxycarbonyl)-5(S)-[l(S)- methyl]propyl-2,3,5,6-tetrahydro-4H-l ,4-oxazin-3-one (1.0g, 3.89 mmol) in DME (12.6 ml) was cooled to -60°C under argon, then transferred via a cannula to a flask containing 4.27 ml of 1.0M NaHMDS solution in THF. The resulting mixture was stirred under argon at -78°C for 5 min. followed by the treatment of benzyl bromide (0.42 ml, 3.5 mmol). The mixture was stirred at -78°C for 0.5 hr, then warmed to -50°C and stirred for 0.5h. It was recooled to -78°C and methyl iodide (0.48 ml, 7.78 mmol) was added. After 10 min of stirring, the mixture was added via cannula to a stirred solution of NaHMDS (1.0M in THF, 4.27 ml) at -78°C. The final mixture was stirred at -78°C for 10 min. before the addition of brine and ether. The organic layer was separated, dried, filtered and evaporated to yield a residue which was purified by flash chromatography to afford the title compound. NMR (CDC13) δ 0.63 (3H, t, J=7Hz), 0.69 (3H, d, J=7Hz), 0.85 (H, m), 1.01 (2H, m), 1.49 (3H, s), 1.53 (9H, s), 2.86 (H, d, J=12Hz), 3.32 (H, d, J=12 Hz), 3.74 (H, m), 3.82 (2H, s), 7.25 (5H, m). Step B: Preparation of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino- 3(S)-methyllpentyloxy-2-methyl-3-phenylpropionic acid A mixture of N-(tert-butoxycarbonyl)-2(S)-benzyl-2- methyl-5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H-l ,4-oxazin-3- one (0.41 g, 1.13 mmol), concentrated hydrochloric acid (4 ml) and acetic acid (4 ml) was heated at reflux overnight. After cooling, the mixture was evaporated to dryness and the residue was mixed with Boc- ON (0.417g) and dissolved in acetone (5 ml) and water (5 ml). The pH value of the mixture was then adjusted to 9 by the addition of triethylamine and stirred at room temperature overnight. The reaction mixture was evaporated to dryness and the residue was treated with 10% citric acid solution (20 ml) and extracted with methylene chloride twice (2x25 ml). The combined extracts were washed with water, dried, filtered and evaporated to leave a residue which was purified by flash chromatography to afford the title compound (0.295g, 0.78 mmol, 69%). NMR (DMSO-d6) δ 0.78 (3H, d, J=7Hz), 0.83 (3H, t, J=7Hz), 1.18 (3H, s), 1.40 (9H, s), 1.57 (H, m), 3.85 (H, d, J=12Hz), 3.98 (H, d, J=12Hz), 6.65 (H, m), 7.23 (5H, m). Step C: Preparation of N-(tert-Butoxycarbonyl)-2(S)-2(S)-amino- 3(S)-methyl]pentyloxy-2-methyl-3-phenylpropionyl- homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1 , Step F, but using N-(tert-butoxycarbonyl)- 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-2-methyl-3-phenylpropionic acid instead of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino-3(S)- methyl]pentyloxy-3-phenylpropionic acid. NMR (CDCI3) δ 0.89 (3H, d, J=7Hz), 0.90 (3H, t, J=7Hz), 1.13 (H, m), 1.43 (12H, s), 1.92 (H, m), 2.51 (H, m), 2.90 (H, d, J=12Hz), 3.03 (H, d, J=12Hz), 3.40 (H, m), 3.57 (H, d of d, J=10, 6Hz), 3.73 (H, m), 4.24 (H, m), 4.35 - 4.48 (2H, m), 4.58 (H, m), 7.23 (5H, m), 7.63 (H, m). Step D: Preparation of 2(S)-[2(S)-amino-3(S)-methyl]-pentyloxy-2- methyl-3-phenylpropionyl-homoserine lactone hydrochloride The title compound was prepared in a similar fashion as that described in Example 1, Step G, but using N-(tert-butoxycarbonyl)- 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-2-methyl-3-phenylpropionyl- homoserine lactone in place of N-(tert-butoxycarbonyl)-2(S)-[2(S)- amino-3(S)-methyl]pentyloxy-3-phenylpropionyl-homoserine lactone. NMR (DMSO-d6) δ 0.79 (3H, d, J=7Hz), 0.85 (3H, t, J=7Hz), 1.15 (H, m), 1.33 (3H, s), 1.48 (H, m), 1.70 (H, m), 2.15 (H, m), 2.32 (H, m), 2.97 (H, d, J=12Hz), 3.07 (H, d, J=12Hz), 3.16 (H, m), 3.52 (H, m), 3.65 (H, d of d, J=10, 3Hz), 4.26 (H, m), 4.37 (H, m), 4.65 (H, q, J=8Hz,), 7.24 (5H, m), 8.44 (H, d, J=8Hz). Step E: Preparation of 2(S)-[2(S)-[2(R)-(tert-Butoxy-carbonyl)- amino-3-triphenylmethylmercapto]propylamino-3(S)- methyl]pentyloxy-2-methyl-3-phenylpropionyl-homosεrine lactone The title compound was prepared in the same manner as that described in Example 1, Step H, but using 2(S)-[2(S)-amino-3(S)- methyl]pentyloxy-2-methyl-3-phenylpropionyl-homoserine lactone hydrochloride in place of 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3- phenylpropionyl-homoserine lactone hydrochloride. Step F: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercaρto]- propylamino-3(S)-methyl]pentyloxy-2-methyl-3- phenylpropionyl-homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step I, but using 2(S)-[2(S)-[2(R)-(tert- butoxycarbonyl)amino-3-triphenylmethylmercapto]propylamino-3(S)- methyl] -penty loxy-2-methy 1-3 -pheny lpropionyl-homoserine lactone in place of 2(S)-[2(S)-[2(R)-(tert-butoxycarbonyl)amino-3-triphenyl- methylmercapto]propylamino-3(S)-methyl]pentyloxy-3-phenyl- propionyl-homoserine lactone. NMR (CD3OD) δ 0.99 (3H, t, J=7Hz), 1.02 (3H, d, J=7Hz), 1.30 (H, m), 1.49 (H, m), 1.52 (3H, s), 1.62 (H, m), 1.94 (H, m), 2.30-2.50 (2H, m), 2.86 (H, d of d, J=15, 7Hz), 3.04 (2H, s), 3.20 (H, m), 3.42 (H, d of d, J=14,6Hz), 3.62 (H, d of d, J=11.3Hz), 3.68-3.85 (2H, m), 4.34 (H, m), 4.48 (2H, m), 7.25 (5H, m). Anal. Calcd for C23H37N3θ4S « 2.15CF3Cθ2H-0.5H2θ: C, 46.46; H, 5.73; N, 5.94 Found: C, 46.49; H, 5.75; N, 5.85. Step G: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-2-methyl-3- phenylpropionyl-homoserine The title compound was prepared in a similar fashion as that described in Example 1, Step J, but using 2(S)-[2(S)-[2(R)-amino-3- mercapto]propylamino-3(S)-methyl]pentyloxy-2-methyl-3-phenyl- propionyl-homoserine lactone in place of 2(S)-[2(S)-[2(R)-amino-3- mercapto]propylamino-3(S)-methyl]pentyloxy-3-phenylpropionyl- homoserine lactone. EXAMPLE 3 Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-propylamino-3(S)- methyl]pentyloxy-4-pentenoyl-homoserine lactone and 2(S)-[2(S)-[2(R)- Amino-3-mercapto]propylamino-3(S)-methyl]pentyloxy-4-pentanoyl- homoserine Step A: Preparation of N-(tert-Butoxycarbonyl)-2(S)-allyl-5(S)- [ 1 (S)-methyl]proρyl-2,3,5,6-tetra-hydro-4H- 1 ,4-oxazin-3- one The title compound was prepared in a similar fashion as that described in Example 1, Step D, but using allyl bromide instead of benzyl bromide. NMR (CDC13) δ 0.94 (3H, t, J=7Hz), 1.00 (3H, d, J=7Hz), 1.24 (H, m), 1.43 (H, m), 1.54 (9H, s), 1.85 (H, m), 2.55 (H, m), 2.76 (6H, m), 3.72 (H, d of d, J=13,3 Hz), 3.96 (H, m), 4.07-4.17 (2H, m), 5.10 (H, d, J=12Hz), 5.18 (H, d of d, i=12,2Hz), 5.86 (H, m). Step B: Preparation of N-(tert-Butoxycarbonyl)-2(S)-[2(S)-amino- 3(S)-methyllpentyloxy-4-pentenoic acid The title compound was prepared in a similar fashion as that described in Example 1, Step E, but using N-(tert-butoxycarbonyl)- 2(S)-allyl-5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H-l ,4-oxazin- 3-one in place of N-(tert-butoxycarbonyl)-2(S)-benzyl-5(S)-[l(S)- methyl]propyl-2,3,5,6-tetrahydro-4H-l,4-oxazin-3-one. NMR (DMSO- d6) δ 0.80 (3H, d, J=7Hz), 0.82 (3H, t, J=7Hz), 1.05 (H, m), 1.38 (9H, s). 1.52 (H, m), 2.25 (H, m), 2.39 (H, m), 3.55 (2H, m), 4.96 (H, d, J=10Hz), 5.02 (H, d, J=17Hz), 5.85 (H, m), 6.73 (H, m). Step C: Preparation of N-(tert-Butoxycarbonyl)-2(S)-[2(S)-amino- 3(S)-methyllpentyloxy-4-pentenoyl-homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1 , Step F, but using N-(tert-butoxycarbonyl)- 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-4-pentenoic acid in place of N- (tert-butoxycarbonyl-2(S)-[2(S)-amino-3(S)-methyl]pentyl-oxy-3- phenylpropionic acid. NMR (CDCI3) δ 0.90 (3H, t, J=7Hz), 0.91 (3H, d, J=7Hz), 1.14 (H, m), 1.44 (9H, s), 2.32 (H, m), 2.44 (H, m), 2.5-2.7 (2H, m), 3.56 (2H, m), 3.75 (H, m), 3.90 (H, m), 4.28 (H, m), 4.44-4.55 (2H, m), 4.70 (H, m), 5.05-5.13 (2H, m), 5.80 (H, m), 7.94 (H, m). Step D: Preparation of 2(S)-[2(S)-Amino-3(S)-methyl]-pentyloxy- 4-pentenoyl-homoserine lactone hydrochloride The title compound was prepared in a similar fashion as that described in Example 1, Step G, but using N-(tert-butoxycarbonyl)- 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-4-pentenoyl-homoserine lactone in place of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine lactone. NMR (CDCI3) δ 0.96 (3H, t, J=7Hz), 1.02 (3H, d, J=7Hz), 1.23 (H, m), 1.62 (H, m), 1.77 (2H, m), 2.05 (H, m), 2.50 (H, m), 2.64 (2H, m), 3.30 (H, m), 3.82 (H, m), 3.91 (H, m), 4.07 (H, m), 4.30 (H, m), 4.52 (H, m), 4.90 (H, m), 5.09 (H, d, J=10Hz), 5.16 (H, d, J=18Hz), 5.85 (H, m), 8.70 (H, m). Step E: Preparation of 2(S)-[2(S)-[2(R)-(tert-Butoxy-carbonyl)- amino-3-triphenylmemylmercapto]pro-pylamino-3(S)- methyllpentyloxy-4-pentenoyl-homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step H, but using 2(S)-[2(S)-amino-3(S)- methyl]pentyloxy-4-pentenoyl-homoserine lactone hydrochloride in place of 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3-phenyl-propionyl- homoserine lactone hydrochloride. NMR (CDCI3) δ 0.83 (3H, t, J=7Hz), 0.91 (3H, t, J=7Hz), 1.47 (9H, s), 3.80 (H, m), 4.23 (H, m), 4.27 (H, m), 5.10-5.15 (2H, m), 5.80 (H, m), 7.15-7.50 (15H, m). Step F: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]-pentyloxy-4-pentenoyl- homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step I, but using 2(S)-[2(S)-[2(R)-(tert- butoxycarbonyl)amino-3-triphenylmethylmercapto]propylamino-3(S)- methyl]-pentyloxy-4-pentenoyl-homoserine lactone in place of 2(S)- [2(S)-[2(R)-(tert-butoxycarbonyl)-amino-3-triphenylmethyl- mercapto]proρylamino-3(S)-methyl]pentyloxy-3-phenylpropionyl- homoserine lactone. NMR (CD3OD) δ 0.99 (3H, t, J=7Hz), 1.04 (3H, d, J=7Hz), 1.34 (H, m), 1.55 (H, m), 1.75 (H, m), 1.93 (2H, m), 2.40 (H, m), 2.52 (2H, m), 2.68 (H, m), 2.8-3.1 (2H, m), 3.56 (H, m), 4.03 (H, m), 4.34 (H, m), 4.50 (2H, m), 5.08-5.20 (2H, m), 5.85 (H, m). Step G: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-4-pentanoyl- homoserine The title compound was prepared in a similar fashion as that described in Example 1, Step J, but using 2(S)-[2(S)-[2(R)-amino-3- mercapto]propylamino-3(S)-methyl]pentyloxy-4-pentanoyl-homoserine lactone in place of 2(S)-[2(S)-[2(R)-amino-3-mercapto]propylamino- 3(S)-methyl]pentyloxy-3-phenylpropionyl-homoserine lactone. EXAMPLE 4 Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-propylamino-3(S)- methyljpentyloxypentanoyl-homoserine lactone and 2(S)-[2(S)-[2(R)- Amino-3-mercapto]propylamino-3(S)-methyl]-pentyloxypentanoyl- homoserine Step A: Preparation of N-(tert-Butoxycarbonyl)-2(S)-[2(S)-Amino- 3(SVmethyl1-pentyloxypentanoyl-homoserine lactone A mixture of N-(tert-Butoxycarbonyl)-2(S)-[2-(S)-amino- 3(S)-methyl]pentyloxy-4-pentenoyl-homoserine lactone (87 mg, 0.22 mmol) and 10% Pd/C (10 mg) in ethyl acetate (10 ml) was hydrogenated at 1 arm for 2h. The catalyst was then removed by filtration and the filtrate was concentrated to give the title compound (82 mg, 0.20 mmol, 91%) as a gum. NMR (CDCI3) δ 0.85-0.97 (9H, m), 1.15 (H, m), 1.42 (9H, s), 2.33 (H, m), 2.64 (H, m), 3.55 (2H, m), 3.76 (H, m), 3.84 (H, m), 4.29 (H, m), 4.45-4.60 (2H, m), 4.70 (H, m), 7.93 (H, m). Step B: Preparation of 2(S)-[2(S)-Amino-3(S)-methyl]-pentyloxy- pentanoyl-homoserine lactone hydrochloride The title compound was prepared in a similar fashion as that described in Example 1, Step G, but using N-(tert-butoxycarbonyl)- 2(S)-2(S)-amino-3(S)-methyl]pentyloxypentanoyl-homoserine lactone in place of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino-3(S)-methyl]pentyl- oxy-3-phenylpropionyl-homoserine lactone. NMR (CDCI3) δ 0.89-1.00 (6H, m), 1.02 (3H, d, J=7Hz), 1.87 (H, m), 2.05 (H, m), 2.52 (H, m), 2.68 (H, m), 3.30 (H, m), 3.77 (H, d of d, J=8,2Hz), 3.86 (H, m), 3.98 (H, t, J=5Hz), 4.30 (H, m), 4.53 (H, t, J=10Hz), 4.91 (H, m), 8.73 (H, d, J=9Hz). Step C: Preparation of 2(S)-[2(S)-[2(R)-(tert-Butoxy-carbonyl)- amino-3-triphenylmemylmercapto]pro-pylamino-3(S)- methyllpentyloxy-pentanoyl-homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step H, but using 2(S)-[2(S)-amino-3(S)- methyljpentyloxypentanoyl-homoserine lactone hydrochloride in place of 2(S)- [2(S )-amino-3 (S)-methy l]pentyloxy-3 -phenyl-propiony 1 - homoserine lactone hydrochloride. Step D: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-pentanoyl-homoserine lactone The title compound was prepared in the same manner as that described in Example 1, Step I, but using 2(S)-[2(S)-[2(R)-(tert- butoxycarbonyl)-amino-3-triphenylmethylmercapto]propylamino-3(S)- methylj-pentyloxy-pentanoyl-homoserine lactone in place of 2(S)-[2(S)- [2(R)-(tert-butoxycarbonyl)amino-3-triphenylmethylmercapto]propyl- amino-3(S)-methyl]-pentyloxy-3-phenylpropionyl-homoserine lactone. NMR (CD3OD) δ 0.97-1.13 (9H, m), 1.36 (H, m), 1.51 (2H, m), 1.61 (H, m), 1.75 (H, m), 1.99 (H, m), 2.45 (H, m), 2.59 (H, m), 2.9-3.1 (2H, m), 4.00 (H, m), 4.37 (H, m), 4.55 (H, m). Anal. Calcd for C18H35N3O4S.2.6CF3CO2H-0.45H2O: C, 40.15; H, 5.59; N, 6.05. Found: C, 40.16; H, 5.60; N, 6.05. Step E: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl1-pentyloxy-pentanoyl-homoserine The title compound was prepared in the same manner as that described in Example 1, Step J, but using 2(S)-[2(S)-[2(R)-amino-3- mercapto]propylamino-3(S)-methyl]pentyloxypentanoyl-homoserine lactone in place of 2(S)-[2(S)-[2(R)-amino-3-mercapto]propylamino- 3(S)-methyl]pentyloxy-3-phenylpropionyl-homoserine lactone. EXAMPLE 5 Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-propylamino-3(S)- methyl]pentyloxy-4-methylpentanoyl-homoserine lactone and 2(S)- [2(S)-[2(R)- ino-3-mercapto]propylamino-3(S)-methyl]pentyloxy-4- methyl-pentanoyl-homoserine Step A: Preparation of N-(tert-Butoxycarbonyl)-2(S)-methyallyl- 5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H-l,4- oxazin-3-one The title compound was prepared in a similar fashion as that described in Example 1, Step D, but using methallyl bromide in place of benzyl bromide. NMR (CDCI3) δ 0.94 (3H, t, J=7Hz), 1.01 (3H, d, J=7Hz), 1.25 (H, m), 1.54 (9H, s), 1.81 (3H, s), 1.83 (H, m), 2.42 (H, d of d, J=15, 11Hz), 2.82 (H, d, J=15Hz), 3.72 (H, d of d, J=12, 3Hz), 3.98 (H, m), 4.13 (H, d, J=12Hz), 4.24 (H, d of d, J=9, 2Hz), 4.82 (H, s), 4.88 (H, s). Step B: Preparation of N-(tert-Butoxycarbonyl)-2(S)-[2(S)-amino- 3(S -methyllpentyloxy-4-methyl-4-pentenoic acid The title compound was prepared in a similar fashion as that described in Example 1, Step E, but using N-(tert-butoxycarbonyl)- 2(S)-methallyl-5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H-l,4- oxazin-3-one in place of N-(tert-butoxycarbonyl)-2(S)-benzyl-5(S)- [ 1 (S)-methyl]propyl-2,3,5,6-tetrahydro-4H-l ,4-oxazin-3-one. NMR (DMSO-d6) δ 0.80 (3H, d, J=7Hz), 0.83 (3H, t, J=7Hz), 1.03 (H, m), 1.37 (9H, s), 1.51 (H, m), 1.73 (3H, s), 2.20 (H, d of d, J=15, 10Hz), 2.37 (H, d of d, J=15, 4Hz), 3.23 (H, d of d, J=10, 7Hz), 3.53 (H, m), 3.72- (H, m), 4.72 (2H, s), 6.75 (H, d, J=8Hz). Step C: Preparation of N-(tert-Butoxycarbonyl)-2(S)-[2(S)-amino- 3(S)-methyl]pentyloxy-4-methyl-4-pentenoyl-homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1 , Step F, but using N-(tert-butoxycarbonyl)- 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-4-methyl-4-pentenoic acid in place of N-(tert-butoxycarbony 1)-2(S)- [2(S )-amino-3 (S )-methyl]penty 1 - oxy-3-phenylpropionic acid. NMR (CDCI3) δ 0.88 (3H, t, J=7Hz), 0.89 (3H, d, J=7Hz), 1.13 (H, m), 1.44 (9H, s), 1.78 (3H, s), 2.31 (H, d of d, J=14, 8Hz), 2.33 (H, m), 2.50 (H, d of d, J=15, 4Hz), 2.65 (H, m), 3.57 (2H, d, J=7Hz), 3.75 (H, m), 3.97 (H, d of d, J=9, 5Hz), 4.28 (H, m), 4.48 (H, d of t, J=9, 1Hz), 4.54 (H, d, J=9Hz), 4.72 (H, m), 4.78 (H, s), 4.83 (H, s), 8.01 (H, m). Step D: Preparation of N-(tert-Butoxycarbonyl)-2(S)-[2(S)-amino- 3(S)-methyl]pentyloxy-4-methyl-pentanoyl-homoserine lactone A mixture of N-(tert-butoxycarbonyl)-2(S)-[2-(S)-amino- 3(S)-methyl]pentyloxy-4-methyl-4-pentenoyl-homoserine lactone (75 mg, 0.18 mmol) and 10% Pd/C (10 mg) in ethyl acetate (10 ml) was hydrogenated on a Parr shaker for 2h. The catalyst was removed by filtration and the filtrate was concentrated in vacuo to afford the title compound (70 mg) as a solid. NMR (CDC13) δ 0.87-0.96 (12H, m), 1.15 (H, m), 1.45 (9H, s), 1.82 (H, m), 2.32 (H, m), 2.65 (H, m), 3.52 (H, d of d, J=16, 9Hz), 3.60 (H, d of d, J=10, 5Hz), 3.77 (H, m), 3.85 (H, t, J=6Hz), 4.28 (H, m), 4.48 (H, d of d, J=10, 1Hz), 4.54 (H, d, J=12Hz), 4.74 (H, q, J=12Hz), 7.98 (H, d, J=8Hz). Step E: Preparation of 2(S)-[2(S)-Amino-3(S)-methyl]-pentyloxy- 4-methylpentanoyl-homoserine lactone hydrochloride The title compound was prepared in a similar fashion as that described in Example 1, Step G, but using N-(tert-butoxycarbonyl)- 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-4-methylpentanoyl-homoserine lactone in place of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine lactone. Step F: Preparation of 2(S)-[2(S)-[2(R)-(tert-Butoxy-carbonyl)- ammo-3-triphenylmethylmercapto]-propylamino-3(S)- methyllpentyloxy-4-methyl-pentanoyl-homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step H, but using 2(S)-[2(S)-amino-3(S)- methyl] -penty loxy-4-methylpentanoyl-homoserine lactone hydro¬ chloride in place of 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3-phenyl- propionyl-homoserine lactone hydrochloride. NMR (CD3OD) δ 0.86 (3H, d, J=7Hz), 0.89 (3H, t, J=7Hz), 0.91 (6H, d, J=7Hz), 1.15 (H, m), 1.45 (9H, s), 1.80 (H, m), 2.25-2.55 (6H, m), 2.67 (H, d of d, J=12, 4Hz), 3.60 (H, m of d, J=10Hz), 3.65 (H, m), 3.74 (H, d of d, J=10, 5Hz), 4.28 (H, m), 4.43 (H, d of t, J=10, 1Hz), 4.66 (H, m), 7.2-7.45 (15H, m). Step G: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-4-methylpentanoyl- homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1 , Step I, but using 2(S)-[2(S)-[2(R)-tert- butoxycarbonyl)-amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-4-methyl-pentanoyl-homoserine lactone in place of 2(S)- [2(S)-[2(R)-(tert-butoxycarbonyl)amino-3-mercapto]propyl-amino-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine lactone. NMR (CD30D) δ 0.95 (3H, d, J=7Hz), 0.97 (3H, d, J=7Hz), 0.98 (3H, t, J=7Hz), 1.04 (3H, d, J=7Hz), 1.25-1.60 (3H, m), 1.65-1.9 (2H, m), 1.97 (H, m), 2.35-2.60 (2H, m), 2.92 (H, d of d, J=14, 7Hz), 3.06 (H, d of d, J=14, 5Hz), 3.28 (H, m), 3.38 (H, d of d, J=14, 7Hz), 3.54 (H, d of d, J=14, 5Hz), 3.68 (H, d of d, J=12, 4Hz), 3.82 (H, m), 3.90 (H, d of d, J=12, 5Hz), 4.00 (H, d of d, J=12, 6Hz), 4.33 (H, m), 4.50 (2H, m of t, J=12Hz). Anal. Calcd for C19H37N3O45-2.6CF3CO2H-O.8H2O: C, 40.68; H, 5.81; N, 5.88 Found: C, 40.68; H, 5.83; N, 6.04. Step H: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-4-methylpentanoyl- homoserine The title compound was prepared in a similar fashion as that described in Example 1, Step J, but using 2(S)-[2(S)-[2(R)-Amino- 3-mercapto]propylamino-3(S)-methyl]pentyloxy-4-methylpentanoyl- homoserine lactone in place of 2(S)-[2(S)-[2(R)-amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-phenyl-propionyl-homoserine lactone. EXAMPLE 6 Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercaρto]-propylamino-3(S)- methyl]pentyloxy-3-methylbutanoyl-homoserine lactone and 2(S)-[2(S)- [2(R)-Amino-3-mercapto]ρropylamino-3(S)-methyl]pentyloxy-3- methyl-butanoyl-homoserine Step A: Preparation of N-(tert-Butoxycarbonyl)-2(R)-(l-hydroxy- l-methyl)ethyl-5(S)-[l(S)-methyl]propyl-2,3,5,6-tetra- hvdro-4H-l .4-oxazin-3-one A solution of N-(tert-butoxycarbonyl)-5(S)-[l(S)- methyl]propyl-2,3,5,6-tetrahydro-4H-l ,4-oxazin-3-one (0.5 g, 1.94 mmol) in DME (6 ml) was cooled to -60°C and transferred under argon via a cannula to a flask containing a solution of NaHMDS (1.0 M in THF, 2.14 ml, 2.14 mmol) at -78°C. The resulting mixture was stirred for 5 mins, acetone (0.16 ml, 2.14 mmol) was added and stirred at -78°C for 4 h. The reaction mixture was treated with saturated aqueous ammonium chloride (2.14 ml), brine (4 ml) and water (1 ml). Then, it was extracted with ether (2x10 ml). The combined extracts were dried, filtered and evaporated to yield a residue. Purification of the residue by flash chromatography afforded the title compound (0.28 g, 0.88 mmol, 45%) as an oil. NMR (CDCI3) δ 0.93 (3H, t, J=7Hz,), 1.00 (3H, d, J=7Hz), 1.27 (3H, s), 1.28 (3H, s), 1.54 (9H, s), 1.82 (H, m), 3.73 (H, m), 3.8-4.0 (2H, m), 4.0-4.25 (2H, m), 4.58 (H, m). Step B: Preparation of N-(tert-Butoxycarbonyl-2-iso-propylidenyl- 5(S)-[l(S)-methyl]-propyl-2,3,5,6-tetrahydro-4H-l,4- oxazin-3-one A solution of N-(tert-butoxycarbonyl)-2(R)-(l -hydroxy- 1 - methyl)ethyl-5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H-l,4- oxazin-3-one (0.597 g, 1.26 mmol) in pyridine (20 ml) was cooled to 0°C and treated with phosphorus oxychloride (1.23 ml) and the resulting mixture was allowed to warm to room temperature and stirred overnight. The reaction mixture was treated with saturated sodium bicarbonate solution (50 ml) and extracted with methylene chloride three times. The combined extracts were washed with brine (15 ml), dried, filtered and evaporated to give a residue which was purified by flash chromatography to yield the title compound (0.196 g, 0.64 mmol, 51%). NMR (CDCI3) δ 0.91 (3H, t, J=7Hz), 0.97 (3H, d, J=7Hz), 1.20 (H, m), 1.54 (9H, s), 1.80 (3H, s), 2.14 (3H, s), 3.93 (H, d of d, J=12, 3Hz), 4.07 (H, t of d, J=8, 2Hz), 4.23 (H, d of d, J=12, 4Hz). Step C: Preparation of N-(tert-Butoxycarbonyl)-2(S)-isopropyl- 5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H-l,4- oxazin-3-one A mixture of N-(tert-butoxycarbonyl)-2-iso-propylidenyl- 5(S)-[l(S)-methyl]propyl-2,3,5,6-4H-l,4-oxazin-3-one (0.19 g, 0.63 mmol) and Ptθ2 (20 mg) in ethyl acetate (20 ml) was hydrogenated on a Parr shaker for 5 h at 54 psi. The reaction mixture was filtered through a pad of Celite and the filtrate was evaporated to give the title compound (0.188 mg, 0.63 mmol, 99%) as an oil. NMR (CDC13) δ 0.92 (3H, t, J=7Hz), 0.93 (3H, d, J=7Hz), 0.99 (3H, d, J=7Hz), 1.04 (3H, d, J=7Hz), 1.53 (9H, s), 1.84 (H, m), 2.47 (H, m), 3.67 (H, d of d, J=14, 4Hz), 3.90 (H, d, J=3Hz), 3.92 (H, m), 4.11 (H, d, J=14Hz). Step D: Preparation of N-(tert-Butoxycarbonyl)-2(S)-[2(S)-amino- 3(S)-methyllpentyloxy-3-methyl-butanoic acid The title compound was prepared in a similar fashion as that described in Example 2, Step B, but using N-(tert-butoxycarbonyl)- 2(S)-isopropyl-5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H-l,4- oxazin-3-one in place of N-(tert-butoxycarbonyl)-2(S)-benzyl-2-methyl- 5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H-l ,4-oxazin-3-one. Step E: Preparation of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino- 3(S)-methyl]pentyloxy-3-methyl-butanoyl-homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step F, but using N-(tert-butoxy carbonyl )- 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3-methylbutanoic acid in place of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino-3(S)-methyl]-pentyloxy-3- phenyl-propionic acid. NMR (CDCI3) δ 0.84-0.95 (9H, m), 0.99 (3H, d, J=7Hz), 1.44 (9H, s), 2.11 (H, m), 2.34 (H, m), 2.63 (H, m), 3.50-3.65 (3H, m), 3.75 (H, m), 4.28 (H, m), 4.45-4.60 (2H, m), 4.72 (H, m), 8.05 (H, m). Step F: Preparation of 2(S)-[2(S)-Amino-3(S)-methyl]-pentyloxy- 3-methyl-butanoyl-homoserine lactone hydrochloride The title compound was prepared in a similar fashion as that described in Example 1, Step G, but using N-(tert-butoxycarbonyl)- 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3-methylbutanoyl-homoserine lactone in place of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine lactone. Step G: Preparation of 2(S)-[2(S)-[2(R)-(tert-Butoxy-carbonyl)- amino-3-triphenylmethylmercapto]propylamino-3(S)- methynpentyloxy-3-methylbutanoyl-homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step H, but using 2(S)-[2(S)-amino-3(S)- methyl]-pentyloxy-3-methylbutanoyl-homoserine lactone hydrochloride in place of 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3-phenylpropionyl- homoserine lactone hydrochloride. Step H: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-methylbutanoyl- homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step I, but using 2(S)-[2(S)-[2(R)-(tert- butoxycarbonyl)-amino-3-triphenylmethylmercapto]propylamino-3(S)- methyl]-pentyloxy-3-methylbutanoyl-homoserine lactone in place of 2(S)-[2(S)-[2(R)-(tert-butoxycarbonyl)amino-3-triphenylmethyl- mercapto]propylamino-3(S)-methyl]-pentyloxy-3-phenylpropionyl- homoserine lactone. NMR (CD3OD) δ 0.93-1.04 (9H, m), 1.07 (3H, d, J=7Hz), 1.33 (H, m), 1.58 (H, m), 2.0 (2H, m), 2.4-2.6 (2H, m), 2.93 (H, d of d, J=16,7Hz), 3.08 (H, d of d, J=16,5Hz), 3.80-3.95 (2H, m), 4.35 (H, m), 4.52 (2H, t, J=10Hz). Anal. Calcd for C18H34N304S-2.35CF3C02H: C, 41.53; H, 5.58; N, 6.40. Found: C, 4.57; H, 5.50; N, 6.58. Step I: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-methylbutanoyl- homoserine The title compound was prepared in a similar fashion as that described in Example 1, Step J, but using 2(S)-[2(S)-[2(R)-amino-3- mercapto] -propylamino-3 (S )-methyl]pentyloxy-3 -methylbutanoyl- homoserine lactone in place of 2(S)-[2(S)-[2(R)-amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-phenyl-propionyl-homoserine lactone. EXAMPLE 7 Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-proρylamino-3(S)- methyl]-pentyloxy-3-phenylbutanoyl-homoserine lactone and 2(S)-[2(S)- [2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]pentyloxy-3-phenyl- butanoyl-homoserine Step A: Preparation of N-(tert-Butoxycarbonyl)-2(S)-(a-methyl- benzyl-5(S)-[ 1 (S)-methyl]propyl-2,3,5,6-tetrahydro-4H- 1.4-oxazin-3-one A solution of N-(tert-butoxycarbonyl)-5(S)-[l-(S)- methyl]propyl-2,3,5,6-tetrahydro-4H-l,4-oxazin-3-one (lg, 3.89 mmol) in DME (17 ml) was cooled to -63°C and added via a cannula to a stirred solution of NaHMDS (1.0M, 4.27 ml, 4.27 mmol) in THF at -78 °C under argon. After 10 min. stirring, a-methylbenzyl bromide (2.65 ml, 19.5 mmol) was added to the mixture, then stirred at -40°C for 2 hours. The reaction mixture was successively treated with saturated ammonium chloride (2.65 ml), brine (5 ml) and water (2 ml), then extracted with ethyl acetate twice (2x20 ml). The combined extracts were washed with brine, dried, filtered and evaporated. The residue was purified by flash chromatography to afford the title compound. NMR (CDCI3) δ 0.91 (3H, t, J=7Hz), 1.0 (3H, d, J=Hz), 1.37 (3H, d, J=7Hz), 1.56 (9H, s), 1.78 (H, m), 3.61 (H, d of d, J=12,3Hz), 3.70 (H, m), 3.92 (H, m) 4.09 (H, d, J=12Hz), 4.19 (H, m), 7.2-7.4 (5H, m). Step B: Preparation N-(tert-Butoxycarbonyl)-2(S)-[2(S)-amino- 3(R)-methyll-pentyloxy-3-phenyl-butanoic acid The title compound was prepared in a similar fashion as that described in Example 1, Step E, but using N-(tert-butoxycarbonyl)- 2(S)-(a-methyl)benzyl-5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H- l,4-oxazin-3-one in place of N-(tert-butoxycarbonyl)-2(S)-benzyl-5(S)- [l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H-l,4-oxazin-3-one. NMR (DMSO-d6) δ 0.73 (3H, d, J=7Hz), 0.82 (3H, t, J=7Hz), 1.04 (H, m), 1.17 (3H, d, J=7Hz), 1.38 (9H, s), 7.1-7.3 (5H, m). Step C: Preparation of N-(tert-Butoxycarbonyl)-2(S)-[2(S)-amino- ° 3(S)-methyl]-pentyloxy-3-phenyl-butanoyl-homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1 , Step F, but using N-(tert-butoxycarbonyl)- 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3-phenylbutanoic acid in place 5 of N-(tert-butoxycarbonyl)-2(S)-[2(S)-Amino-3(S)-methyl]-pentyloxy- 3-phenylpropionic acid. NMR (CDCI3) δ 0.77 (3H, d, J=7Hz), 0.87 (3H, t, J=Hz), 1.08 (h, m), 1.24 (3H, d, J=7Hz), 1.48 (9H, s), 2.31 (H, m), 2.62 (H, m), 3.13 (H, t, J=10Hz), 3.35 (2H, m), 3.70 (H, m), 3.93 (H, m), 4.29 (H, m), 4.48 (2H, m), 4.71 (H, m), 7.3 (5H, m), 8.07 (H, 0 m). Step D: Preparation of 2(S)-[2(S)-Amino-3(S)-methyl]-pentyloxy- 3-phenylbutanoyl-homoserine lactone hydrochloride The title compound was prepared in the same manner as 5 that described in Example, Step G, but using N-(tert-butoxycarbonyl)- 2(S)-[2(S)-Amino-3(S)-methyl]-pentyloxy-3-phenylbutanoyl-homoserine lactone in place of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine lactone. NMR (DMSO-d6) δ 0.70 (3H, d, J=7Hz), 0.83 (3H, t, J=7Hz), 1.08 (H, m), 1.28 (3H, d, J=7Hz), 1.44 (H, m), 1.65 (H, m), 2.1-2.3 (2H, m), 3.09 (H, m), 3.18 (H, m), 3.57 (H, m), 3.93 (H, d, J=4Hz), 4.22 (H, m), 4.38 (H, m), 4.48 (H, m), 7.2-7.35 (5H, m), 7.90 (H, m). Step E: Preparation of 2(S)-[2(S)-[2(R)-(tert-Butoxy-carbonyl)- amino-3-triphenylmethylmercapto]propylamino-3(S)- methvnpentyloxy-3-phenylbutanoyl-homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step H, but using 2(S)-[2(S)-amino-3(S)- methyl]-pentyloxy-3-phenylbutanoyl-homoserine lactone hydrochloride in place of 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3-phenylpropionyl- homoserine lactone hydrochloride. NMR (CDCI3) δ 0.71 (3H, d, J=7Hz), 0.85 (3H, t, J=7Hz), 1.27 (3H, d, J=7Hz), 1.43 (9H, s), 4.25 (H, m), 4.44 (H, m), 4.62-4.80 (2H, m), 7.15-7.5 (20H, m). Step F: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-phenylbutanoyl- homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step I, but using 2(S)-[2(S)-[2(R)-(tert- butoxycarbonyl)-amino-3-triphenylmethylmercapto]propylamino-3(S)- methyl]-pentyloxy-3-phenylbutanoyl-homoserine lactone in place of 2(S)-[2(S)-[2(R)-(tert-butoxycarbonyl)-amino-3-triphenylmethyl- mercapto]propylamino-3(S)-methyl]pentyloxy-3-phenylpropionyl- homoserine lactone. NMR (CD3OD) δ 1.00 (3H, t, J=7Hz), 1.06 (3H, d, J=7Hz), 1.40 (3H, d, J=7Hz), 1.55 (H, m), 1.9-2.2 (3H, m), 2.93 (H, d of d, J=16,8Hz), 3.03-3.20 (2H, m), 3.50 (H, m of d), 3.78 (H, m), 3.80-3.90 (2H, m), 3.97 (H, d, J=8Hz), 4.12-4.30 (2H, m), 4.44 (H, d of t), 7.30 (5H, m). Anal. Calcd for C23H37N3θ4S-2.2CF3Cθ2H « 1.90H2θ: C, 44.67; H, 5.88; N, 5.70 Found: C, 44.70; H, 5.89; N, 5.58 Step G: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propy lamino-3 (S )-methy l]pentyloxy-3 -pheny lbutanoy 1 - homoserine The title compound was prepared in a similar fashion as that described in Example 1, Step J, but using 2(S)-[2(S)-[2(R)-amino-3- mercapto]propylamino-3-(S)-methyl]pentyloxy-3-phenylbutanoyl- homoserine lactone in place of 2(S)-[2(S)-[2(R)-amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-phenyl-propionyl homoserine lactone. EXAMPLE 8 Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-propylamino-3(S)- methyl]pentylthio-2-methy 1-3 -pheny 1-propionyl-homoserine lactone and 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentylthio-2-methyl-3-phenylpropionyl-homoserine Step A: Preparation of methyl α-[3(S)-methyl-4(S)-(tert-butoxy- carbonvDaminolpentylthioacetate Boc anhydride (6.56 g, 30 mmol) was added to a stirred solution of L-isoleucinol (3.2 g, 27 mmol) in THF (70 ml). The resulting mixture was warmed but kept below 50°C to effect a clear solution. Then, the stirring was continued at room temperature for 45 minutes. The mixture was evaporated and the residue was redissolved in chloroform (70 ml), cooled to 0°C and treated successively with triethylamine (5.8 ml, 41 mmol) and methanesulfonyl chloride (3.2 ml, 41 mmol). The resulting mixture was stirred at room temperature for 0.5 hours, concentrated in vacuo and the residue was distributed between ethyl acetate (100 ml), and water (100 ml). The organic layer was washed with water twice (2 x 100 ml), dried, filtered and evaporated. The solid residue was dissolved in THF (70 ml), with cesium carbonate (8.9 g, 27 mmol) and methyl a-mercaptoacetate (2.5 ml, 27 mmol). The resulting mixture was heated at reflux for 1 hour. Additional amounts of cesium carbonate (0.9 g) and methyl mercaptoacetate (0.25 ml) were added and heating continued for another hour. After cooling, the solvent was removed by evaporation and the residue was partitioned between ethyl acetate (100 ml) and water (100 ml). The organic layer was washed with water (2 x 100 ml), dried, filtered and evaporated. Purification of the residue by flash chromatography using hexane:ethyl acetate (v: 1=9=1 ) as the eluant gave the title compound (6.04 g, 19.8 mmol, 73%) as an oil. NMR (CDCI3) δ 0.90 (3H, d, J=6Hz), 0.93 (3H, t, 3=6Hz), 1.11 (H, m), 1.47 (9H, s), 1.60 (H, m), 3.67 (H, d of d, J=14.8Hz), 2.77 (H, d of d, J=14,4Hz), 3.23 (H, d, J=14Hz), 3.33 (H, d, J=14Hz), 3.70 (H, m), 4.60 (H, m). Step B: Preparation of 5(S)-[l(S)-methyl]propyl-2,3,5,6- tetrahvdro-4H-l .4-thiazin-3-one Trifluoroacetic acid (8 ml) was added to a solution of methyl α-[3(S)-methyl-4(S)-(tert-butoxy-carbonyl)amino]pentylthio- acetate (6.04 g, 19.8 mmol) in chloroform (10 ml). The mixture was stirred at room temperature for 3 hours, then concentrated by evaporation. The residue was treated with toluene (80 ml) and di-i- propylethylamine (10 ml), heated on a steam bath for 0.5 hours. After cooling, the reaction mixture was concentrated by evaporation and the residue was partitioned between ethyl acetate and water. The organic layer was dried, filtered and evaporated to yield the title compound (2.73 g, 15.8 mmol, 80%) as a solid, mp 103-5°C. NMR (CDCI3) δ 0.92 (3H, d, J=6Hz), 0.94 (3H, t, J=6Hz), 1.25 (H, m), 1.4-1.65 (2H, m), 2.63 (H, d of d, J=14,l 1Hz), 2.71 (H, d of d, J=14.4 Hz), 3.24 (H, d, J=17Hz), 3.34 (H, d, J=17Hz), 3.60 (H,m), 6.15 (H, bs). Step C: Preparation of N-(tert-Butoxycarbonyl)-5(S)-[l(S)- methyllpropyl-2.3.5.6-tetrahvdro-4H-1.4-thiazin-3-one The title compound was prepared in a similar fashion as that described in Example 1, Step C, but using THF and 5(S)-[1(S)- methyl]propyl-2,3,5,6-tetrahydro-4H-l,4-thiazin-3-one in place of methylene chloride and 5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro- 4H-l ,4-oxazin-3-one, respectively. NMR (CDCI3) δ 0.92 (3H, t, J=6Hz), 0.99 (3H, d, J=6Hz), 1.14 (H, m), 1.58 (9H, s), 1.97 (H, m), 2.90 (H, d of d, J= 13.5 Hz), 3.05 (H, d of d, J=13.5 Hz), 3.32 (H, d, J=15 Hz), 3.42 (H, d, J=15 Hz), 4.50 (H, m). Step D: Preparation of N-(tert-Butoxycarbonyl)-2(S)-benzyl-5(S)- [ 1 (S)-methyl]propyl-2,3 ,5,6-tetrahydro-4H- 1 ,4-thiazin-3- one The title compound was prepared in a similar fashion as that described in Example 1 , Step D, but using benzyl iodide and N- (tert-butoxycarbonyl)-5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H- l,4-thiazin-3-one in place of benzyl bromide and N-tert-butoxy- carbonyl)-5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H-l,4-oxazin- 3-one, respectively. NMR (CDCI3) δ 0.85 (3H, d, J=6Hz), 0.88 (3H, t, J=6Hz), 1.13 (H, m), 1.52 (9H, s), 1.96 (H, m), 2.72 (H, d of d, J=14.6Hz), 3.44 (H, d of d, J=14.6 Hz), 3.83 (H, d of d, J=8.5Hz), 4.26 (H, m), 7.3 (5H, m). Step E: Preparation of N-(tert-butoxycarbonyl)-2(S)-benzyl-2- methyl-5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H- 1.4-thiazin-3-one Sodium bis(trimethylsilyl)amide (1M in THF, 6 ml, 6 mmol) was added to a solution of N-(tert-butoxycarbonyl)-2(S)-benzyl- 5(S)-[l(S)-methyl]propyl-2,3,5,6-tetrahydro-4H-l,4-thiazin-3-one (1.85 g, 5.1 mmol) in DME (10 ml) at -78°C under argon. The mixture was stirred at -78°C for 15 minutes and treated with methyl iodide (0.38 ml, 6 mmol). The reaction mixture was stirred at -78°C for 1 hour and quenched with acetic acid (1 ml). The final mixture was partitioned between ethyl acetate (100 ml) and water (100 ml). The organic layer was washed with water (2 x 100 ml), dried, filtered and evaporated to give a residue which was purified by flash chromatography. Elution of the column with hexane/ethyl acetate (v:v=20:l) gave the title compound (1.16 g, 3.1 mmol, 79% based on the unrecovered starting material). NMR (CDCI3) δ 0.75 (3H, d, J=6Hz), 0.82 (3H, t, J=6Hz), 1.05 (H, m), 1.33 (H, m), 1.51 (9H, s), 1.56 (3H, s), 1.78 (H, m), 2.56 (H, d of d, J=15.6Hz), 2.85 (H, d of d , J=15.5 Hz), 3.03 (H, d, J=14Hz), 3.28 (H, d, J=14Hz), 4.23 (H, m), 7.28 (5H, m). Further elution led to the recovery of the starting material (0.44 g, 1.2 mmol). Step F: Preparation of 2(S)-[2(S)-Amino-3(S)-methyl]-pentylthio- 2-methyl-3-phenylpropionic acid hydrochloride N-(tert-Butoxycarbonyl)-2(S)-benzyl-2-methyl-5(S)-[l(S)- methyl]propyl-2,3,5,6-tetrahydro-4H-l ,4-thiazin-3-one (0.96 g, 2.55 mmol) was dissolved in a mixture of acetic acid (10 ml), water (5 mL) and hydrochloric acid (12N, 5 ml). The resulting mixture was stirred and heated on a steam bath for 5 hours. After cooling , the reaction mixture was evaporated in vacuo to afford the title compound (ca. 0.75 g, 2.5 mmol). NMR (CDCI3) δ 0.96 (3H, m), 1.07 (3H, m) 1.48 (3H, s), 1.61 (H, m), 2.0 (H, m), 2.94 (H, d of d, J=14Hz), 3.1 (2H, bs, 3.40 (H, d of d, J=14Hz), 7.30 (5H, m). Step G: Preparation of N-(tert-Butoxycarbonyl)-2(S)-[2(S)-amino- 3(S -methyllpentylthio-2-methyl-3-phenylpropionic acid To a stirred solution of 2(S-[2(S)-amino-3(S)-methyl]- pentylthio-2-methyl-3-phenylpropionic acid hydrochloride (ca. 0.75 g, 2.5 mmol) in THF (28 ml) and water (4 ml) were added Boc anhydride (0.87 g, 4 mmol) and triethylamine (0.5 ml). The resulting mixture was stirred at room temperature overnight. An additional portion of triethylamine (0.1 ml) was added and stirring was continued for 5 hours. The reaction mixture was partitioned between ethyl acetate and 10% citric acid. The aqueous layer was washed with water, dried, filtered and evaporated to give the title compound (ca. 0.99 g, 2.5 mmol) as a gummy oil. NMR (DMSO-d6) δ 0.82 (3H, d, J=6Hz), 0.85 (3H, t, J=6Hz), 1.37 (9H, s), 1.38 (3H, s), 2.67 (H, d of d, J=12, 6Hz), 2.80 (H, d of d, J=12, 5Hz), 2.82 (H, d, J=14Hz,), 3.32 (H, d, J=14Hz), 3.48 (H, m), 6.78 (H, d, J=9Hz), 7.25 (5H, m). Step H: Preparation of N-(tert-Butoxycarbonyl)-2(S)-[2(S)-amino- 3(S)-methyl]-pentylthio-2-methyl-3-phenylpropionyl- homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1 , Step F, but using N-(tert-butoxycarbonyl)- 2(S)-[2(S)-amino-3(S)-methyl]pentylthio-2-methyl-3-phenylpropionic acid in place of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino-3(S)- methyl]pentyloxy-3-phenylρropionic acid. NMR (CDCI3) δ 0.88 (3H, t, J=6Hz), 0.90 (3H, d, J=6Hz), 1.08 (H, m), 2.10 (H, m), 2.50 (H, m), 2.58 (H, d of d, J=14.11Hz), 2.80 (H, d of d, J=12.4 Hz), 3.05 (H, d, J=14Hz), 3.12 (H, d, J-14Hz), 3.70 (H, m), 4.25 (H, m), 4.42 (H, m), 4.55-4.75 (2H, m), 7.25 (5H, m), 7.90 (H, d, J=8Hz). Step I: Preparation of 2(S)-[2(S)-Amino-3(S)methyl]-pentylthio-2- methyl-3-phenylpropionyl-homo-serine lactone hydrochloride The title compound was prepared in a similar fashion as that described in Example 1 , Step G, but using N-(tert-butoxycarbonyl)- 2(S)-[2(S)-amino-3(S)-methyl]pentylthio-2-methyl-3-phenylpropionyl- homoserine lactone in place of N-tert-butoxycarbonyl)-2(S)-[2(S)- amino-3(S)-methyl]pentyloxy-3-pheny 1-propionyl-homoserine lactone. NMR (DMSO-d6) δ 0.88 (3H, t, J=6Hz), 0.92 (3H, d, J=6Hz), 1.13 (H, m), 1.39 (3H, s), 1.42 (H, m), 1.73 (H, m), 2.2-2.4 (2H, m), 3.71 (H, d of d, J=14.9Hz), 2.90 (H, d, J=13Hz), 2.93 (H, d of d, J=14.5 Hz), 3.25 (H, m), 3.31 (H, d, J=13Hz), 4.25 (H, m), 4.40 (H, m), 4.62 (H, q, J=10Hz), 7.25 (5H, m), 8.53 (H, d, J=8Hz). Step J: Preparation of 2(S)-[2(S)-[2(R)-(tert-Butoxy-carbonyl)- amino-3-triphenylmethylmercapto]-propylamino-3(S)- methyl]pentylthio-2-methyl-3-phenylpropionyl-homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step H, but using 2(S)-[2(S)-amino-3(S)- methyl]pentylthio-2-methyl-3-phenylpropionyl-homoserine lactone hydrochloride. NMR (CD3OD) δ 0.81 (3H, d, J=6Hz), 0.90 (3H, t, J=6Hz), 1.10 (H,m), 1.30 (H, m), 1.38 (3H, s), 1.43 (9H, s), 1.60 (H, m), 2.93 (H, d, J=14Hz), 3.21 (H, d, J=14Hz), 3.57 (H, m), 4.25 (H, m), 4.42 (H, m), 4.45-4.65 (2H, m), 7.15-7.45 (20H, m). Step K: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]pentylthio-2-methyl-3-phenylpropionyl- homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step I, but using 2(S)-[2(S)-[2(R)-(tert- butoxycarbonyl)-amino-3-triphenylmethylmercapto]propylamino-3(S)- methyl]-pentylthio-2-methyl-3-phenylpropionyl-homoserine lactone in place of 2(S)-[2(S)-[2(R)-(tert-butoxy-carbonyl)amino-3-triphenyl- methylmercapto]propyl-amino-3(S)-methyl]pentyloxy-3-phenyl- propionyl-homoserine lactone. NMR (CD3OD) δ 0.98 (3H, t, J=7Hz), 1.01 (3H, d, J=7Hz), 1.32 (H, m), 1.57 (3H, s), 1.87 (H, m), 2.43 (2H, m), 4.25-4.35 (2H, m), 4.53 (H, m), 7.15-7.35 (5H, m). MS m/e 468 M+. Step L: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylammo-3(S)-methyl]pentylthio-2-methyl-3- phenylpropionyl-homoserine The title compound was prepared in a similar fashion as that described in Example 1, Step J, but using 2(S)-[2(S)-[2(R)-amino-3- mercapto]propylamino-3(S)-methyl]pentylthio-2-methyl-3-phenyl- propionyl-homoserine lactone in place of 2(S)-[2(S)-[2(R)-amino-3- mercapto]propylamino-3(S)-methyl]pentyloxy-3-phenyl-propionyl- homoserine lactone. EXAMPLE 9 Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-propylamino-3(S)- methyl]-pentylsulfonyl-2-methyl-3-phenylpropionyl-homoserine lactone and 2(S)-[2(S)-[2(R)-Amώo-3-mercapto]propylamino-3(S)-methyl]- pentyl-sulfonyl-2-methyl-3-phenylpropionyl-homoserine Step A: Preparation of N-(tert-Butoxycarbonyl)-2(S)-[2(S)-amino- 3 (S )-methy l]pentylsulf onyl-2-methy 1 -3-phenylpropionyl - homoserine lactone To a solution of N-(tert-butoxycarbonyl)-2(S)-2(S)-amino- 3(S)-methyl]pentylthio-2-methyl-3-phenylpropionyl-homoserine lactone (0.39 g, 0.82 mmol) in chloroform (5 ml) was added a solution of m- chloropeoxy-benzoic acid (0.3 g, 1.7 mmol) in chloroform (5 ml). The resulting mixture was stirred at room temperature until the completion of the reaction was indicated by TLC analysis. The reaction mixture was diluted with ethyl acetate (100 ml), then washed with saturated sodium bicarbonate (3 x 50 ml) followed by water (2 x 50 ml). The organic layer was dried, filtered and evaporated to give the title compound (0.37 g, 0.72 mmol, 88%) as a gum. NMR (CDC13) δ 0.92 (3H, t, J=7Hz), 0.94 (3H, d, J=7Hz), 1.46 (9H, s), 1.51 (3H, s), 1.87 (H, m), 2.34 (H, m), 2.68 (H, m), 3.17 (H, d, J=14Hz), 3.63 (H, d, J=14Hz), 4.16 (H, m), 4.32 (H, m), 4.5-4.65 (2H, m), 5.00 (H, d, J=10Hz), 7.15-7.35 (5H, m). FABMS m/e 511 (M+H+). Step B: Preparation of 2(S)-[2(S)-Amino-3(S)-methyl]-pentyl- sulfonyl-2-methyl-3-phenylpropionyl-homoserine lactone hydrochloride The title compound was prepared in a similar fashion as that described in Example 1 , Step G, but using N-(tert-butoxycarbonyl)- 2(S)-[2(S)-amino-3(S)-methyl]pentylsulfonyl-2-methyl-3-phenyl- propionyl-homoserine lactone in place of N-(tert-butoxy-carbonyl)- 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3-phenylpropionyl-homoserine lactone. NMR (DMSO-d6) δ 0.88 (3H, t, J=7Hz), 0.94 (3H, d, J=7Hz), 1.42 (3H, s), 2.25-2.45 (2H, m), 2.97 (H, d, J=12Hz), 3.65-3.80 (3H, m), 4.27 (H, m), 4.43 (H, m), 4.68 (H, d, of d, J=18, 10Hz), 7.28 (5H, m), 8.80 (H, d, J=8Hz). Step C: Preparation of 2(S)-[2(S)-[2(R)-(tert-Butoxy-carbonyl)- amino-3-triphenylmethylmercapto]-propylamino-3(S)- methyl]pentylsulfonyl-2-methyl-3-phenylpropionyl- homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step H, but using 2(S)-[2(S)-amino-3(S)- methyl]pentylsulfonyl-2-methyl-3-phenylpropionyl-homoserine lactone hydrochloride in place of 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3- phenylpropionyl-homoserine lactone hydrochloride. NMR (CDCI3) δ 0.79 (3H, d, J=7Hz), 0.90 (3H, t, 3=7Hz), 1.40 (9H, s), 1.51 (3H, s), 1.64 (H, m), 2.95-3.22 (4H, m), 3.50-3.65 (2H, m) 4.23 (H, m), 4.46 (H, t, J=9Hz), 4.61 (H, m), 5.08 (H, m), 7.13-7.50 (20H, m). Step D: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyl-sulfonyl-2-methyl-3- phenylpropionyl-homoserine lactone The title compound was prepared in a similar fashion as that described in Example 1, Step I, but using 2(S)-[2(S)-[2(R)-(tert- butoxycarbonyl)amino-3-triphenylmethylmercapto]propylamino-3(S)- methyl]-pentylsulfonyl-2-methyl-3-phenylpropionyl-homoserine lactone in place of 2(S)-[2(S)-[2(R)-(tert-butoxy-carbonyl)amino-3-triρhenyl- memylmercapto]propylamino-3(S)-methyl]-pentyloxy-3-phenyl- propionyl-homoserine lactone. NMR (CD3OD) δ 0.97 (3H, d, J=7Hz), 1.00 (3H, t, J=7Hz), 1.29 (H, m), 1.49 (3H, s), 1.85 (H, m), 2.35-2.52 (2H, m), 2.76 (H, d of d, J=14.6Hz), 3.86 (H, d of d, J=14.5Hz), 3.00 (H, d, J=12Hz), 3.09 (H, d of d, J=14,5Hz), 3.63 (H, m), 3.81 (H, d, J=12Hz), 4.25-4.40 (2H, m), 4.53 (H, m of t), 7.20-7.35 (5H, m). Anal. Calcd for C23H38N305S2-2.45 CF3CO2H-0.55 H2O: C, 42.42; H, 5.31; N, 5.31. Found: C, 42.38; H, 5.28; N, 5.47. Step E: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyl-sulfonyl-2-methyl-3- phenylpropionyl-homo-serine The title compound was prepared in a similar fashion as that described in Example 1, Step J, but using 2(S)-[2(S)-[2(R)-amino-3- mercapto]-propylamino-3(S)-methyl]pentylsulfonyl-2-methyl-3- phenylpropionyl-homoserine lactone in place of 2(S)-[2(S)-[2(R)-amino- 3-mercapto]-propylamino-3(S)-methyl]-pentyloxy-3-phenylpropionyl- homoserine lactone. EXAMPLE 10 Preparation of 2(S)-[2(R)-Aιmno-3-mercapto]propyl-amino-3(S)- methyllpentyloxy-3-phenylpropionyl-methionine methyl ester Step A: Preparation of N-(tert-Butoxycarbonyl)-2(S)-[2(S)-amino- 3 (S )-methyl] -penty loxy-3-pheny 1-propionyl-methione methyl ester The title compound was prepared in accordance with the procedure described in Example 1 Step F, employing methionine methyl ester hydrochloride in place of homoserine lactone hydrochloride. NMR (CD3OD) δ 0.78 (3H, d, J=6Hz), 0.89 (3H, t, J=6Hz). 1.11 (H, m), 1.47 (9H, s), 2.06 (3H, s), 2.2-2.4 (2H, m), 2.90 (H, d of d, J=14.7Hz), 3.05 (H,d of d, J=14.5Hz), 3.38 (H, d of d, J=8.6Hz), 3.5-3.55 (2H, m), 3.71 (3H, s), 3.97 (H, d of d, J=7.5Hz), 6.60 (H, d, J=10Hz), 7.24 (5H, m). Step B: Preparation of 2(S)-[2(S)-Amino-3(S)-methyl]-pentyloxy- 3-phenylpropionyl-methionine methyl ester hydrochloride The title compound was prepared in a similar fashion as that described in Example 1, Step G, but using N-(tert-butoxycarbonyl- 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3-phenylpropionyl-methione methyl ester in place of N-(tert-butoxycarbonyl)-2(S)-[2(S)-amino- 3(S)methyl]pentloxy-3-phenylproρionyl-homoserine lactone. NMR (CD3OD) δ 0.84 (3H, d, J=6Hz), 0.93 (3H, t, J=6Hz), 1.20 (H, m), 1.40 (H, m), 1.60 (H, m), 2.08 (3H, s), 2.3-2.5 (2H, m), 2.98 (H, d of d, J=14.7Hz), 3.11 (H, d of d, J=14.5 Hz), 3.23 (H, m), 3.57 (H, d of d, J=10.6Hz), 3.70 (H, d, J=3Hz), 3.73 (3H, s), 4.12 (H, d of d, J=8.6Hz), 7.30 (5H, m). Step C: Preparation of 2(S)-[2(S)-[2(R)-(tert-Butoxy-carbonyl)-3- triphenylmemyl-mercapto]propyl-amino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine methyl ester The title compound was prepared in a similar fashion as that described in Example 1, Step H, but using 2(S)-[2(S)-amino-3(S)- methyl]pentyloxy-3-phenyl-propionyl-methionine methyl ester hydrochloride in place of 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3- phenylpropionyl-homoserine lactone hydrochloride. NMR (CD3OD) δ 0.68 (3H, d, J=6Hz), 0.87 (3H, t, J=6Hz), 1.46 (9H, s), 2.05 (3H, s), 2.68 (H, m), 2.87 (H, d of d, J=14.7Hz) 3.05 (H, d of d, J=14.4Hz), 3.67 (3H, s), 3.91 (H, d of d, J=8.4Hz), 4.70 (H, m), 7.1-7.4 (20H, m). Step D: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-phenylpropionyl- methionine methyl ester The title compound was prepared in the same manner as that described in Example 1, Step I, but using 2(S)-[2(S)-[2(R)-(tert- butoxycarbonyl)amino-3-triphenylmethylmercapto]propylamino-3(S)- memyl] -penty loxy-3-phenylpropionyl-methionine methyl ester in place of 2(S)-[2(S)-[2(R)-(tert-butoxycarbonyl)-amino-3-triphenylmethyl- mercapto]propylamino-3(S)-methyl]pentyloxy-3-phenylpropionyl- homoserine lactone. NMR (CD3OD) δ 0.83 (3H, d, J=6Hz), 0.92 (3H, t, J=6Hz), 1.20 (H, m), 1.48 (H, m), 1.84 (H, m), 2.08 (3H, s), 2.4-2.6 (2H, m), 2.8-3.0 (3H, m), 3.05-3.2 (2H, m), 3.55 (H, d of d, J=14, 4Hz), 3.68 (2H, m), 3.73 (3H, s), 4.19 (H, d of d, J=8.6Hz), 4.68 (H, d of d, J=10.6Hz), 7.30 (5H, m). Anal. Calcd for C24H4lN3θ4S2«2CF3Cθ2H«0.7H2θ: C, 45.42; H, 6.04; N, 5.68. Found: C, 45.14; H, 5.65; N, 5.87. EXAMPLE 11 Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-propylamino-3(S)- methyllpentyloxy-3-phenylpropionyl-methionine Step A: Preparation of 2(S)-[2(S)-[2(R)-(tεrt-butoxy-carbonyl)- amino-3-triphenyl-methylmercapto]-propylamino-3(S)- methyllpentyloxy-3-phenyl-propionyl-methionine To a solution of 2(S)-[2(S)-[2(R)-(tert-butoxycarbonyl)- amino-3 -triphenylmethylmercapto] -propylamino-3 (S)-methyl] - pentyloxy-3-phenylpropionyl-methionine methyl ester (120 mg, 0.143 mmol) in methanol (4 ml) was added sodium hydroxide (IN, 0.57 ml, 0.57 mmol) and the resulting mixture was stirred at room temperature for 3 hours. Another portion of sodium hydroxide (IN, 0.25 ml) was added and stirring continued for 0.5 hours. The reaction mixture was concentrated and the residue was dissolved in a minimum amount of water and neutralized with hydrochloric acid (IN, 0.87 ml). The aqueous solution was extracted with ethyl acetate three times. The combined extracts were dried (Na2Sθ4) and concentrated to yield the title compound (110 mg, 0.133 mmol, 93%). NMR (CD3OD) δ 0.70 (3H, d, J=6Hz), 0.80 (3H, t, J=6Hz), 1.05 (H, m), 1.34 (9H, s), 1.60 (H, m), 1.95 (3H, S), 2.7-2.9 (3H, m), 2.95-3.1 (2H, m), 3.95 (H, d of d, J=8, 4Hz), 4.27 (H, d of d, J=8.6Hz), 7.1-7.4 (20H, m). Step B: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-phenylpropionyl- methionine The title compound was prepared in the same manner as that described in Example 1, Step I, but using 2(S)-[2(S)-[2(R)-(tert- butoxycarbonyl)-amino-3-triphenylmethylmercapto]propylamino-3(S)- methyl]-pentyloxy-3-phenylpropionyl-methionine in place of 2(S)-[2(S)- [2(R)-(tert-butoxycarbonyl)-amino-3-triphenylmethylmercapto]- propylamino-3(S)-methyl]-pentyloxy-3-phenylpropionyl-homoserine lactone. NMR (CD3OD) δ 0.82 (3H, d, J=6Hz), 0.95 (3H, t, J=6Hz), 1.20 (H, m), 1.40 (H, m), 1.85 (H, m), 2.10 (3H, s), 2.4-2.6 (2H, m), 3.1-3.2 (2H, m), 3.35 (H, d of d, J=14, 6Hz), 3.55 (H, d of d, J=14, 5Hz), 4.20 (H, d of d, J=10, 5Hz), 4.63 (H, d of d, J=10.6Hz), 7.27 (5H, m). Anal. Calcd for C23H39N3θ4S2«2CF3Cθ2H«2H2θ: C, 43.25; H, 6.05; N, 5.60. Found: C, 43.09; H, 6.01; N, 5.46. EXAMPLE 12 Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-propylamino-3(S)- methyllpentyloxy-3-phenylpropionyl-methionine sulfone methyl ester Step A: Preparation of Methionine sulfone methyl ester Thionyl chloride (2.63 ml, 36 mmol) was added dropwise to a stirred solution of N-Boc-Met sulfone (5 g, 18 mmol) in methanol (40 ml) cooled at 0°C. After the completion of the addition, the resulting mixture was warmed to room temperature and stirred overnight. The reaction mixture was recooled to 0°C and slowly treated with solid sodium bicarbonate to adjust the pH to 7. The mixture was concentrated in vacuo to remove methanol and the residue was dissolved in a minimum amount of water (solution pH ca. 10) and extracted with ethyl acetate four times. The combined extracts were dried (Na2Sθ4) and concentrated to give the title compound (1.5 g). NMR (CD3OD) δ 2.04 (H, m), 2.21 (H, m), 2.98 (3H, s), 3.23 (2H, t, J=7Hz), 3.63 (H, d of d, J=8.6Hz), 3.77 (3H, s). Step B: Preparation of N-(tert-Butoxycarbonyl)-2(S)-[2(S)-amino- 3(S)-methyl]-pentyloxy-3-phenyl-propionyl-methionine sulfone methyl ester The title compound was prepared in the same fashion as that described in Example 1, Step F, but using methionine sulfone methyl ester in place of homoserine lactone hydrochloride. NMR (CD3OD) δ 0.80 (3H, d, J=6Hz), 0.88 (3H, t, J=6Hz), 1.12 (H, m), 1.47 (9H, s), 2.10 (H, m), 2.32 (H, m), 2.93 (3H, s), 3.5-3.7 (2H, m), 3.74 (3H, s), 4.01 (H, d of d, J=7.4Hz), 4.60 (H, d of d, J=9.5Hz), 6.60 (H, d, J=8Hz), 7.25 (5H, m). Step C: Preparation of 2(S)-[2(S)-Amino-3(S)-methyl]-pentyloxy- 3-phenylpropionyl-methionine sulfone methyl ester hydrochloride The title compound was prepared in the same fashion as that described in Example 1, Step G, but using N-(tert-butoxycarbonyl)- 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3-ρhenylpropionyl-methionine sulfone methyl ester in place of N-(tert-butoxycarbonyl)-2(S)-[2(S)- amino-3(S)-methyl]pentyloxy-3-phenylpropionyl-homoserine lactone. NMR (CD3OD) δ 0.85 (3H, d, J=6Hz), 0.94 (3H, t, J=6Hz), 1.20 (H, m), 1.52 (H, m), 1.72 (H, m), 2.14 (H, m), 2.38 (H, m), 2.98 (3H, s), 3.57 (H, d of d, J=12, 6Hz), 3.73 (H, d of d, J=12, 9Hz), 3.78 (3H, s), 4.15 (H, d of d, J=8.6Hz), 4.63 (H, d of d, J=8.5Hz), 7.30 (5H, m). Step D: Preparation of 2(S)-[2(S)-[2(R)-(tert-Butoxy-carbonyl)- amino-3-triphenylmethylmercapto]-propylamino-3(S)- methyl]pentyloxy-3-phenyl-propionyl-methionine sulfone methyl ester The title compound was prepared in a similar fashion as that described in Example 1, Step H, but using 2(S)-[2(S)-amino-3(S)- methyl]pentyloxy-3-phenyl-propionyl-methionine sulfone methyl ester hydrochloride in place of 2(S)-[2(S)-amino-3(S)-methyl]pentyloxy-3- phenylpropionyl-homoserine lactone hydrochloride. NMR (CD3OD) δ 0.70 (3H, d, J=6Hz), 0.88 (3H, t, J=6Hz), 1.10 (H, m), 1.47 (9H, s), 2.15 (H, m), 2.67 (H, m), 2.92 (3H, s), 3.67 (H, m), 4.68 (H, d of d, J=10, 6Hz), 7.15-7.45 (20H, m). Step E: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-phenylpropionyl- methionine sulfone methyl ester The title compound was prepared in a similar fashion as that described in Example 1, Step I, but using 2(S)-[2(S)-[2(R)-(tert- butoxycarbonyl)amino-3-triphenylmethylmercapto]propylamino-3(S)- methyl] -pentyloxy-3 -pheny lpropionyl-methionine sulfone methyl ester in place of 2(S)-[2(S)-[2(R)-(tert-butoxy-carbonyl)-amino-3-triphenyl- methylmercapto]propylamino-3(S)-methyl]pentyloxy-3-phenyl- propionyl-homoserine lactone. NMR (CD3OD) δ 0.83 (3H, d, J=6Hz), 0.93 (3H, t, J=6Hz), 1.20 (H, m), 1.51 (H, m), 1.80 (H, m), 2.22 (H, m). 2.43 (H, m), 3.00 (3H, s), 3.78 (3H, s), 4.20 (H, d of d, J=8.4Hz), 4.72 (H, d of d, J=10, 6Hz), 7.30 (5H, m). FABMS m/z 532 (MH+). EXAMPLE 13 Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-propylamino-3(S)- meth yl 1 -pent yl ox v- -phen ylpropion yl -methionine sulfone Step A: Preparation of 2(S)-[2(S)-[2(R)-(tert-Butoxy-carbonyl)- amino-3-triphenylmemylmercapto]-propylamino-3(S)- methynpentyloxy-3-phenyl-propionyl-methionine sulfone The title compound was prepared in a similar fashion as that described in Example 11, Step A, but using 2(S)-[2(S)-[2(R)-(tert- butoxycarbonyl)amino-3-triphenylmethylmercapto]propylamino-3(S)- methyl] -penty loxy-3-phenylpropionyl-methionine sulfone methyl ester in place of 2(S)-[2(S)-[2(R)-(tert-butoxycarbonyl)amino-3-triphenyl- methylmercapto]propylamino-3(S)-methyl]pentyloxy-methionine methyl ester. NMR (CD3OD) δ 0.79 (3H, d, J=6Hz), 0.90 (3H, t, J=6Hz), 1.47 (9H, s), 2.92 (3H, s), 4.08 (H, m), 4.32 (H, m), 7.15-7.35 (20H, m). Step B: Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]-pentyloxy-3-phenylpropionyl- methionine sulfone The title compound was prepared in a similar fashion as that described in Example 1, Step I, but using 2(S)-[2(S)-[2(R)-(tert- butoxycarbonyl)amino-triphenylmethylmercapto]propylamino-3(S)- methyl]-pentyloxy-3-phenylpropionyl-methionine sulfone in place of 2(S)-[2(S)-[2(R)-(tert-butoxycarbonyl)amino-3-triphenylmethyl- mercapto]propylamino-3(S)-methyl]-pentyloxy-3-phenylpropionyl-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine lactone. NMR (CD3OD) δ 0.84 (3H, d, J=6Hz), 0.94 (3H, t, J=6Hz), 1.21 (H, m), 1.50 (H, m), 1.82 (H, m), 2.24 (H, m), 2.47 (H, m), 2.98 (3H, s), 3.6-3.75 (3H, m), 4.20 (H, d of d, J=9.5Hz), 4.64 (H, d of d, J=9.6Hz), 7.30 (5H, m). Anal. Calcd for C23H39N3θ6S2«3CF3Cθ2H: C, 40.51; H, 4.92; N, 4.89. Found: C, 40.47; H, 5.11; N, 4.56. EXAMPLE 14 Preparation of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-propylamino-3(S)- methyl]-pentyloxy-3-phenylpropionyl-methionine sulfone isopropyl ester The title compound was prepared using methods A-E from Example 12, except for Method A. Methionine sulfone isopropyl ester was prepared by coupling t-butyloxycarbonylmethionine sulfone with isopropyl alcohol using dicyclohexylcarbodiimide (DCC) and 4- dimethylaminopyridine (DMAP) followed by deprotection with HCI in EtOAc. NMR (CD3OD) δ 0.83 (3H, d, J = 6 Hz), 0.94 (3H, t, J = 6 Hz), 1.11-1.56 (2H, m), 1.28 (6H, d, J = 6 Hz), 1.8-1.96 (IH, m), 2.12- 2.27 (IH, m), 2.89-3.0 (2H, m), 3.01 (3H, s), 3.06-3.3 (4H, m), 3.42 (IH, dd, J = 6, 13 Hz), 3.65 (IH, dd, J = 6,13 Hz), 3.68-3.91 (3H, m), 4.2-4.27 (IH, m), 4.61-4.7 (IH, m), 4.96-5.12 (2H, m), 7.19-7.44 (5H, m). Anal. Calc'd. for C26H45N3O6S2 • 2 CF3CO2H: C, 44.07; H, 5.67; N, 4.97; Found C, 44.35; H, 5.68; N, 5.23 EXAMPLE 15 Preparation of 2-(S)-[2(S)-2(R)-amino-3-mercapto]-propylamino-3(S)- methyl]pentyloxy-3-naphth-2-yl-propionyl-methionine sulfone methyl ester The title compound was prepared in similar fashion as that described in Example 12 Step E using 2-(S)-[2(S)-2(R)-(tert Butyoxy- carbonyl)amino-3-triphenylmethylmercapto]-propylamino-3(S)- methyl]pentyloxy-3-naphth-2-yl-propionyl-methionine sulfone methyl ester in place of 2-(S)-[2(S)-2(R)-(tert Butyoxy-carbonyl)amino-3- triphenylmethylmercapto]-propylamino-3(S)-methyl]pentyloxy-3- phenyl-propionyl-methionine sulfone methyl ester. NMR(CD3θD) δ 0.77 (3H, m), 0.85 (3H, m), 1.15 (IH, m), 1.42 (IH, m), 1.87 (IH, m), 2.23 (IH, m), 2.44 (IH, m), 2.86 (2H, m), 2.90 (3H, s), 3.12 (2H, m), 3.20-3.40 (IH, m), 3.42 (IH, m), 3.58 (IH, brd, J=14.0Hz), 3.65-3.85 (6H,m), 4.33 (IH, m), 4.70 (IH, m), 7.40-7.50 (3H, m), 7.70-7.90 (4H, m). Anal. Calc'd. for C28H43O6N3S2 % C, 41.79 H, 4.98; N, 4.19 Found % C, 41.78; H, 4.99; N, 4.27 Includes 1.55 H2O and 3.45 TFA EXAMPLE 16 Preparation of 2-(S)-[2(S)-2(R)-amino-3-mercapto]-propylamino-3(S)- methyllpentyloxy-3-naphth-2-yl-propionyl-methionine sulfone The title compound was prepared in similar fashion as that described in Example 13 Step B using 2-(S)-[2(S)-2(R)-(tert Butyoxy- carbonyl)amino-3-triphenylmethylmercapto]-propylamino-3(S)- methyl]pentyloxy-3-naphth-2-yl-propionyl-methionine sulfone in place of 2-(S)-[2(S)-2(R)-(tert Butyoxy-carbonyl)amino-3-triphenylmethyl- mercapto]-propylamino-3(S)-methyl]pentyloxy-3-phenyl-propionyl- methionine sulfone. NMR(CD3θD) δ 0.77 (3H, d, J= 6.9Hz), 0.85 (3H, t, J=7Hz), 1.15 (IH, m), 1.45 (IH, m), 1.87 (IH, m), 2.23 (IH, m), 2.48 (IH, m), 2.86 (2H, t, J=5.6Hz), 2.92 (3H, s), 3.14 (2H, t, J=6.8Hz), 3.22 (IH, m), 3.38 (IH, dd, J=7.8 and 13.8Hz), 3.58 (IH, dd, J=4.1 and 13.8Hz), 3.65-3.85 (3H, m), 4.33 (IH, dd, J=4.6 and 5.8Hz), 4.65 (IH, dd, J=4.68 and 9.0Hz), 7.40-7.50 (3H, m), 7.70-7.90 (4H, m). Anal. Calc'd. for C27H41O6N3S2 % C, 40.11 H, 4.66; N, 4.03 Found % C, 40.11 ; H, 4.64; N, 4.35 Includes 1.65 H2O and 3.90 TFA EX AMPLE 17 Preparation of 2-(S)-[2(S)-2(R)-amino-3-mercapto]-propylamino-3(S)- methyl]pentyloxy-3-naphth-l-yl-propionyl-methionine sulfone methyl ester The title compound was prepared in similar fashion as that described in Example 12 Step E using 2-(S)-[2(S)-2(R)-(tert Butyoxy- carbonyl)amino-3-triphenylmethylmercapto]-propylamino-3(S)- methyl]pentyloxy-3-naphth- 1 -yl-propionyl-methionine sulfone methyl ester in place of 2-(S)-[2(S)-2(R)-(tert Butyoxy-carbonyl)amino-3- triphenylmethylmercapto]-propylamino-3(S)-methyl]pentyloxy-3- phenyl-propionyl-methionine sulfone methyl ester. NMR(CD3θD) 0.64 (3H, d, J= 6.8Hz), 0.87 (3H, t, J=7.2Hz), 1.10 (IH, m), 1.43 (IH, m), 1.73 (IH, m), 2.24 (IH, m), 2.45 (IH, m), 2.92 (2H, dd, J=4.5 and 6.0Hz), 2.99 (3H, s), 3.15 (2H, t, J=7.5Hz), 3.35-3.90 (6H, m), 4.36 (IH, dd, J=8.5 and 5.3Hz), 4.70 (IH, dd, J=5.2 and 8.9Hz), 7.40-7.60 (4H, m), 7.80 (IH, dd, J=7.6 and 1.8Hz), 7.90 (IH, dd, J=8.2 and 1.8Hz), 8.19 (IH, d, J=8.3Hz). Anal. Calc'd. for C28H43O6N3S2 % C, 43.23 H, 5.15; N, 4.45 Found % C, 43.22; H, 4.80; N, 4.41 Includes 1.15 H2O and 3.0 TFA EXAMPLE 18 Preparation of 2-(S)-[2(S)-2(R)-amino-3-mercapto]-propylamino-3(S)- methyllpentyloxy-3-naphth-l -yl-propionyl-methionine sulfone The title compound was prepared in similar fashion as that described in Example 13 Step B using 2-(S)-[2(S)-2(R)-(tert Butyoxy- carbonyl)amino-3-triphenylmethylmercapto]-propylamino-3(S)- methyl]pentyloxy-3-naphth-l -yl-propionyl-methionine sulfone in place of 2-(S)-[2(S)-2(R)-(tert Butyoxy-carbonyl)amino-3-triphenylmethyl- mercapto]-propylamino-3(S)-methyl]pentyloxy-3-phenyl-propionyl- methionine sulfone. NMR(CD3θD) δ 0.64 (3H, d, J= 6.9Hz), 0.87 (3H, t, J=7.3Hz), 1.10 (IH, m), 1.45 (IH, m), 1.75 (IH, m), 2.28 (IH, m), 2.51 (IH, m), 2.86-3.0 (2H, m), 3.32 (3H, s), 3.19 (2H, t, J=7.4Hz), 3.35-3.65 (4H, m), 3.73 (IH, dd, J=11.5 and 2.7Hz), 3.83 (IH, m), 4.36 (IH, dd, J=2.2 and 5.1Hz), 4.65 (IH, dd, J=4.90 and 8.6Hz), 7.40-7.70 (4H, m), 7.81 (IH, d, J=7.6Hz), 7.91 (IH, d, J=7.6Hz), 8.21 (IH, d, J=8.3Hz). Anal. Calc'd. for C27H41O6N3S2 % C, 43.23 H, 5.615 N, 4.45 Found % C, 43.22; H, 4.80; N, 4.41 Includes 0.65 H2O and 2.90TFA. EXAMPLE 19 2(S)-[2(SH2(R)-Ammo-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-methylbutanoyl-methionine methyl ester The title compound was prepared in similar fashion as that described in Example 13 Step B using 2-(S)-[2(S)-2(R)-(tert Butyoxy- carbonyl)amino-3-triphenylmethylmercapto]-propylamino-3(S)- methyl]pentyloxy-3-methylbutanoyl-methionine methyl ester in place of 2-(S)-[2(S)-2(R)-(tert Butyoxy-carbonyl)amino-3-triphenylmethyl- mercapto]-propylamino-3(S)-methyl]pentyloxy-3-phenyl-propionyl- methionine methyl ester. NMR(CD3θD) δ 0.90-1.10 (12H, m), 1.35 (IH, m), 1.57 (IH, m), 1.90 (IH, m), 2.05 (IH, m), 2.10 (3H, s), 2.20 (IH, m), 2.50-2.70 (2H, m), 2.90-3.00 (2H, m), 3.50-3.90 (7H, m), 4.71 (IH, dd, J=3.6 and 4.9Hz). Anal. Calc'd. for C2θH4lθ4N3S2% C, 41.08H, 6.21; N, 5.87 Found % C, 41.08; H,6.22; N, 5.83 Includes 0.45 H2O and 2.25 TFA EXAMPLE 20 2(S)-[2(S)-[2(R)-Am o-3-mercaρto]propylamino-3(S)-methyl]- pentyloxy-3-rnethylbutanoyl-methionine The title compound was prepared in similar fashion as that described in Example 13 Step B using 2-(S)-[2(S)-2(R)-(tert Butyoxy- carbonyl)amino-3-triphenylmethylmercapto]-propylamino-3(S)- methyl]pentyloxy-3-methylbutanoyl-methionine in place of 2-(S)-[2(S)- 2(R)-(tert Butyoxy-carbony l)amino-3 -triphenylmethy lmercapto] - propylamino-3(S)-methyl]pentyloxy-3-phenyl-propionyl-methionine. NMR (CD3OD) δ 0.90-1.10 (12H, m), 1.30 (IH, m), 1.57 (IH, m), 1.90 (IH, m), 2.05 (IH, m), 2.10 (3H, s), 2.20 (IH, m), 2.50-2.70 (2H, m), 3.00-3.10 (2H, m), 3.40-3.50 (IH, m), 3.60-3.70 (2H, m), 3.75 (IH, m), 3.88 (IH, m), 4.60 (IH, dd, J=9.5 and 4.4Hz). Anal. Calc'd. for Cl9H39θ4N3S2% C, 40.35H, 6.09; N, 6.03 Found % C, 40.36; H,6.10; N,6.21 ° Includes 0.45 H2O and 2.2 TFA EXAMPLE 21 Disulphide of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)- 5 methyllpentyloxy-3-phenylpropionyl-homoserine lactone To a solution of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-phenylpropionyl-homoserine lactone (87.8 mg 0.122 mmol) in methanol (12.2 ml), was added iodine, (28.7 mg, 0.131 mmol) after 15 minutes of the crude reaction mixture (4.0 ml) was purified directly by HPLC using a gradient elution 95:5 to 5:95% wateπacetonitrile containing 0.1% trifluroacetic acid, to afford the title compound. NMR(CD3θD) δ 0.68 (3H, d, J= 6.8Hz), 0.92 (3H, t, J=7.3Hz), 1.10 (IH, m), 1.15 (2H, m), 1.50 (IH, m), 1.80 (IH, m), 2.17 (IH, m), 2.28 (IH, m), 2.45 (IH, m), 2.90-3.10 (3H, m), 3.40 (IH, m), 3.70 (2H, m), 3.85 (IH, m), 4.12 (IH, m), 4.30 (IH, m), 4.46 (IH, m), 4.56 (IH, m), 7.20-7.35 (5H, m). Anal. Calc'd. for C44H68O8N6S2 % C, 43.38 H, 5.34; N, 5.63 Found % C, 43.04; H, 4.94; N, 5.92 Includes 3.05 H2O and 4.95 TFA EXAMPLE 22 Disulphide of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)- methyllpentyloxy-3-phenylpropionyl-homoserine To a solution of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-phenylpropionyl-homoserine lactone (87.8 mg 0.122 mmol) in methanol (12.2 ml), was added iodine, (28.7 mg, 0.131 mmol), after 15 minutes of the crude reaction mixture (8.2 ml) was treated with 1M sodium hydroxide (0.409 ml) and after 30 minutes was purified directly by HPLC using a gradient elution 95:5 to 5:95% wateπacetonitrile containing 0.1% trifluoroacetic acid, to afford the title compound. NMR (d6DMSO) δ 0.70 (3H, d, J= 6.8Hz), 0.82 (3H, t, J=7.0Hz), 1.10 (IH, m), 1.38 (IH, m), 1.70-2.00 (2H, m), 2.70-3.80 (13H, m), 4.02 (IH, m), 4.36 (IH, m), 7.20-7.40 (5H, m). Anal. Calc'd. for C44H72O10N6S2 % C, 43.38 H, 5.48; N, 5.68 Found % C, 43.39; H, 5.47; N, 5.75 Includes 1.85 H2O and 4.7 TFA EXAMPLE 23 Disulphide of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)- methynpentyloxy-3-methylbutanoyl-methionine methyl ester To a solution of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]- propylamino-3(S)-methyl]pentyloxy-3-methylbutanoyl-methionine methyl ester (38 mg 0.053 mmol) in methanol (7 ml), was added iodine, (11.4 mg, 0.045 mmol) after 15 minutes of the crude reaction mixture was purified directly by HPLC using a gradient elution 95:5 to5:95% wateπacetonitrile containing 0.1 % trifluroacetic acid, to afford the title compound. NMR(CD3θD) δ 0.90-1.10 (12H, m), 1.30 (IH, m), 1.60 (IH, m), 1.90 (IH, m), 1.90-2.10 (2H, m), 2.10 (3H, s), 2.17 (IH, m), 2.40-2.70 (2H, m), 3.00-3.10 (2H, m), 3.20-3.35 (2H, m), 3.50 (IH, m), 3.65 (IH, m), 3.73 (3H, m), 3.90 (IH, m), 4.72 (IH, dd, J=4.5 and 9.7Hz). Anal. Calc'd. for C40H8OO8N6S2 % C. 39.43 H, 5.67; N, 5.39 Found % C, 39.42; H, 5.66; N, 5.52 Includes 1.1 H2O and 5.6 TFA EXAMPLE 24 In vitro inhibition of ras famesyl transferase The assay was conducted as described in Pompliano, et. al., Biochemistry 21, 3800 (1992) with the exception of utilizing recombinant human farnesyl transferase in place of the partially purified bovine enzyme described therein. The activity of the compounds of this invention is shown in Table 1. TABLE 1 Inhibition of RAS farnesylation bv compounds of this invention Compound ICsn (nM)* 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]-pentyloxy-3-phenyl- propionyl -homoserine 5 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]-pentyloxy-2-methyl- 3-phenylpropionyl-homoserine 7 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]-pentyloxy-4-pentanoyl- homoserine 18 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]-pentyloxypentanoyl- homoserine 7 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3 (S )-methy 1] -penty loxy-4-methyl- pentanoyl-homoserine 19 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]-pentyloxy-3-methyl- butanoyl-homoserine 1.4 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]-pentyloxy-3-phenyl- butanoyl-homoserine 17 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]-pentylthio-2-methyl-3- phenylpropionyl -homoserine 240 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]-pentylsulfonyl-2-methyl- 3 -phenylpropionyl-homoserine 980 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]-pentyloxy-3-phenyl- propionyl-methionine 4 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]-pentyloxy-3-phenyl- propionyl-methionine sulfone 2.2 *(IC50 is the concentration of the test compound which gives 50% inhibition of FTase under the described assay conditions. EXAMPLE 25 In vivo ras farnesylation assay The cell line used in this assay was the v-ras line, which expressed viral Ha-ras p21. The assay was performed essentially as described in DeClue, J.E. et. ah, Cancer Research 51, 712-717, (1991 ). Cells in 10 cm dishes at 50-75% confluency were treated with the test compound (final concentration of solvent, methanol or dimethyl sulfoxide, was 0.1%). After 4 hours at 37°C, the cells were labelled in 3 ml methionine-free DMEM supplemeted with 10% regular DMEM, 2% fetal bovine serum and 400 μCi[35S]methionine (1000 Ci/mmol). After an additional 20 hours, the cells were lysed in 1 ml lysis buffer (1 % NP40/20 mM HEPES, pH 7.5/5 mM Mg/Cl2/lmM DTT/10 μg/ml aprotinen/2 μg/ml leupeptin/2 μg/ml antipain/0.5 mM PMSF) and the lysates cleared by centrifugation at 100,000 x g for 45 minutes. Aliquots of lysates containing equal numbers of acid-precipitable counts were bought to 1 ml with IP buffer (lysis buffer lacking DTT) and immunoprecipitated with the ras-specific monoclonal antibody Y 13-259 (Furth, M.E. et. al., J. Virol. 43, 294-304, (1982)). Following a 2 hour antibody incubation at 4°C, 200 μl of a 25% suspension of protein A- Sepharose coated with rabbit anti rat IgG was added for 45 minutes. The immunoprecipitates were washed four times with IP was buffer (20 nM HEPES, pH 7.5/1 mN EDTA/ 1% Triton X- 100.0.5% deoxycholate/0.1%/SDS.0.1 M NaCI) boiled in SDS-Page sample buffer and loaded on 13% acrylamide gels. When the dye front reached the bottom, the gel was fixed, soaked in Enlightening, dried and autoradiographed. The intensities of the bands corresponding to famesylated and nonfamesylated ras proteins were compared to determine the percent inhibition of farnesyl transfer to protein. Data for representative test compounds are tabulated in Table 2. TABLE 2 Inhibition of RAS farnesylation by compounds of this invention in the v-ras cell line Compound ICsfi (μM) 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]-pentyloxy-3-phenyl- propionyl-homoserine lactone 2.5 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]-pentyloxy-2-methyl- 3-phenylpropionyl-homoserine lactone 50 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3 (S)-methyl] -penty loxy-4-pentanoyl- homoserine lactone 10 2(S)-[2(S)-[2(R)-Amino-3-mercapto]proρyl- amino-3(S)-methyl]-pentyloxypentanoyl- homoserine lactone 10 2(S)-[2(S)-[2(R)-Amino-3-mercapto]proρyl- amino-3(S)-methyl]-pentyloxy-4-methyl- pentanoyl-homoserine lactone 10 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3 (S )-methy 1] -pentyloxy-3 -pheny 1 - propionyl-methionine methyl ester 0.1 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propyl- amino-3(S)-methyl]-pentyloxy-3-phenyl- propionyl -methionine sulfone methyl ester 0.1 2(S)-[2(S)-[2(R)-Amino-3-mercapto]-propyl- amino-3(S)-methyl]-pentyloxy)-3-phenylpropionyl- methionine sulfone isopropyl ester 0.1

Claims: WHAT IS CLAIMED IS: 1. A compound which inhibits farnesyl-protein transferase of the formula I: I wherein Rl is hydrogen, an alkyl group, an aralkyl group an acyl group, an aracyl group, an aroyl group, an alkylsulfonyl group, aralkylsulfonyl group or arylsulfonyl group, wherein alkyl and acyl groups comprise straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; R2 and R3 are the side chains of naturally occurring amino acids, including their oxidized forms which may be methionine sulfoxide or methionine sulfone, or in the alternative may be substituted or unsubstituted aliphatic, aromatic or heteroaromatic groups, such as allyl, cyclohexyl, phenyl, pyridyl, imidazolyl or saturated chains of 2 to 8 carbon atoms which may be branched or unbranched, wherein the aliphatic substitutents may be substituted with an aromatic or heteroaromatic ring; R4 is hydrogen or an alkyl group, wherein the alkyl group comprises straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; T is O or S(0) m ; m and n are independently 0, 1 or 2; or the pharmaceutically acceptable salts thereof. 2. A prodrug of a compound of Claim 1 of the formula II: wherein Rl is hydrogen, an alkyl group, an aralkyl group an acyl group, an aracyl group, an aroyl group, an alkylsulfonyl group, aralkylsulfonyl group or arylsulfonyl group, wherein alkyl and acyl groups comprise straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; R2 and R3 are the side chains of naturally occurring amino acids, including their oxidized forms which may be methionine sulfoxide or methionine sulfone, or in the alternative may be substituted or unsubstituted aliphatic, aromatic or heteroaromatic groups, such as allyl, cyclohexyl, phenyl, pyridyl, imidazolyl or saturated chains of 2 to 8 carbon atoms which may be branched or unbranched, wherein the aliphatic substitutents may be substituted with an aromatic or heteroaromatic ring; R4 is hydrogen or an alkyl group, wherein the alkyl group comprises straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; T is O or S(0)m; m and n are independently 0, 1 or 2; or the pharmaceutically acceptable salts and disulfides thereof. 3. A compound which inhibits farnesyl-protein transferase of the formula HI: wherein Rl is hydrogen, an alkyl group, an aralkyl group, an acyl group, an aracyl group, an aroyl group, an alkylsulfonyl group, aralkylsulfonyl group or arylsulfonyl group, wherein alkyl and acyl groups comprise straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; R2, R3 and R are the side chains of naturally occurring amino acids, including their oxidized forms which may be methionine sulfoxide or methionine sulfone, or in the alternative may be substituted or unsubstituted aliphatic, aromatic or heteroaromatic groups, such as allyl, cyclohexyl, phenyl, pyridyl, imidazolyl or saturated chains of 2 to 8 carbon atoms which may be branched or unbranched, wherein the aliphatic substitutents may be substituted with an aromatic or heteroaromatic ring; R4 is hydrogen or an alkyl group, wherein the alkyl group comprises straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; T is O or S(0) m ; m is 0, 1 or 2; or the pharmaceutically acceptable salts thereof. 4. A prodrug of a compound of Claim 3 of the formula IV: IV 5 wherein Rl is hydrogen, an alkyl group, an aralkyl group, an acyl group, an aracyl group, an aroyl group, an alkylsulfonyl group, aralkylsulfonyl group or arylsulfonyl group, wherein alkyl and acyl groups comprise straight chain or branched chain 0 hydrocarbons of 1 to 6 carbon atoms; R2, R3 and R5 are the side chains of naturally occurring amino acids, including their oxidized forms which may be methionine 5 sulfoxide or methionine sulfone, or in the alternative may be substituted or unsubstituted aliphatic, aromatic or heteroaromatic groups, such as allyl, cyclohexyl, phenyl, pyridyl, imidazolyl or saturated chains of 2 to 8 carbon atoms which may be branched or unbranched, wherein the o aliphatic substitutents may be substituted with an aromatic or heteroaromatic ring: R4 is hydrogen or an alkyl group, wherein the alkyl group comprises straight chain or branched chain hydrocarbons of 1 to 6 carbon atoms; R6 is a substituted or unsubstituted aliphatic, aromatic or heteroaromatic group such as saturated chains of 1 to 8 carbon atoms, which may be branched or unbranched, wherein the aliphatic substituent may be substituted with an aromatic or heteroaromatic ring; T is O or S(0) m ; m is 0, 1 or 2; or the pharmaceutically acceptable salts and disulfides thereof. 5. A compound which inhibits farnesyl-protein transferase which is: 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-2-methyl-3-phenylpropionyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-4-pentenoyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxypentanoyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-4-methylpentanoyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-methylbutanoyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylbutanoyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentylthio-2-methyl-3-phenylpropionyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentylsulfonyl-2-methyl-3-phenylpropionyl-homoserine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylρropionyl-methionine, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine sulfone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine sulfone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)- methyl]pentyloxy-3-naphth-2-yl-propionyl-methionine sulfone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)- methyl]pentyloxy-3-naphth-l -yl-propionyl-methionine sulfone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)- methyl]pentyloxy-3-methylbutanoyl-methionine, Disulphide of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine lactone, Disulphide of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)- methyl]pentyloxy-3-phenylpropionyl-homoserine, or the pharmaceutically acceptable salts thereof. 6. A prodrug of a compound which inhibits farnesyl- protein transferase which is: 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-2-methyl-3 -phenylpropionyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-4-pentenoyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxypentanoyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-4-methylpentanoyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-methylbutanoyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercaρto]propylamino-3(S)-methyl]- pentyloxy-3 -pheny Ibutanoyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentylthio-2-methyl-3-phenylproρionyl-homoserine lactone, 2(S)-[2(S)-[2(R)-Amino-3-mercaρto]propylamino-3(S)-methyl]- penty lsulf onyl -2-methy 1-3 -phenylpropionyl-homoserine lactone , 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3 -pheny lpropionyl-methionine methyl ester, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-ρhenylpropionyl-methionine sulfone methyl ester, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3 -pheny lpropionyl-methionine sulfone isopropyl ester, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- ρentyloxy-3-naphth-2-yl-propionyl-methionine sulfone methyl ester, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-napth-l -yl-propionyl-methionine sulfone methyl ester, 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-methylbutanoyl-methionine methyl ester, Disulphide of 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)- methyl]pentyloxy-3-methylbutanoyl-methionine methyl ester; or the pharmaceutically acceptable salts and disulfides thereof. 7. The compound of Claim 1 which is: 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-homoserine or the pharmaceutically acceptable salts thereof. 8. The compound of Claim 2 which is: 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-homoserine lactone or the pharmaceutically acceptable salts thereof. 9. The compound of Claim 3 which is: 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine or the pharmaceutically acceptable salts thereof. 10. The compound of Claim 4 which is: 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine methyl ester or the pharmaceutically acceptable salts thereof. 11. The compound of Claim 3 which is: 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine sulfone or the pharmaceutically acceptable salts thereof. 12. The compound of Claim 4 which is: 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3-phenylpropionyl-methionine sulfone methyl ester or the pharmaceutically acceptable salts thereof. 13. The compound of Claim 5 which is: 2(S)-[2(S)-[2(R)-Amino-3-mercapto]propylamino-3(S)-methyl]- pentyloxy-3 -pheny lpropionyl-methionine sulfone isopropyl ester, or the pharmaceutically acceptable salts thereof. 5 14. A pharmaceutical composition comprising a pharmaceutical carrier, and dispersed therein, a therapeutically effective amount of a compound of Claim 1. 0 15. A pharmaceutical composition comprising a pharmaceutical carrier, and dispersed therein, a therapeutically effective amount of a compound of Claim 2. 16. A pharmaceutical composition comprising a 5 pharmaceutical carrier, and dispersed therein, a therapeutically effective amount of a compound of Claim 3. 17. A pharmaceutical composition comprising a pharmaceutical carrier, and dispersed therein, a therapeutically effective o amount of a compound of Claim 4. 18. A pharmaceutical composition comprising a pharmaceutical carrier, and dispersed therein, a therapeutically effective amount of a compound of Claim 5. 19. A pharmaceutical composition comprising a pharmaceutical carrier, and dispersed therein, a therapeutically effective amount of compound of Claim 6. 20. A method for inhibiting farnesylation of Ras protein which comprises administering to a mammal in need thereof a therapeutically effective amount of a composition of Claim 14. 21. A method for inhibiting farnesylation of Ras protein which comprises administering to a mammal in need thereof a therapeutically effective amount of a composition of Claim 15. 22. A method for inhibiting farnesylation of Ras protein which comprises administering to a mammal in need thereof a therapeutically effective amount of a composition of Claim 16. 23. A method for inhibiting farnesylation of Ras protein which comprises administering to a mammal in need thereof a therapeutically effective amount of a composition of Claim 17. 24. A method for inhibiting farnesylation of Ras protein which comprises administering to a mammal in need thereof a therapeutically effective amount of a composition of Claim 18. 25. A method for inhibiting farnesylation of Ras protein which comprises administering to a mammal in need thereof a therapeutically effective amount of a composition of Claim 19. 26. A method for treating cancer which comprises administering to a mammal in need thereof a therapeutically effective amount of a composition of Claim 14. 27. A method for treating cancer which comprises administering to a mammal in need thereof a therapeutically effective amount of a composition of Claim 15. 28. A method for treating cancer which comprises administering to a mammal in need thereof a therapeutically effective amount of a composition of Claim 16. 29. A method for treating cancer which comprises administering to a mammal in need thereof a therapeutically effective amount of a composition of Claim 17. 30. A method for treating cancer which comprises administering to a mammal in need thereof a therapeutically effective amount of a composition of Claim 18. 31. A method for treating cancer which comprises administering to a mammal in need thereof a therapeutically effective amount of a composition of Claim 19.

Inventors: ANTHONY NEVILLE J, DESOLMS S JANE, LEE TA J, ANTHONY, NEVILLE, J., DESOLMS, S., JANE, LEE, TA, J.
Applicants: MERCK & CO INC, MERCK & CO., INC.
Application year: 1993
Main classification: C07C323
IPC codes: A61K31, A61P35, A61P43, C07C323, C07D307