Patent ID: 7285676

Claim:
A method of preparing a compound represented by Structural Formula (I): or salts thereof; wherein, R 1 is —H or a substituted or unsubstituted alkyl group; and R 2 is a substituted or unsubstituted C1-C4 alkyl group; comprising the steps of: a) reacting a compound represented by Structural Formula (II): wherein R 3 is —OH, a substituted or unsubstituted alkyloxy group, or a halogen; with a substituted or unsubstituted benzoic acid, thereby forming a substituted thiazoline represented by Structural Formula (III): wherein Ar is a substituted or unsubstituted phenyl group and R 3 is as defined above; b) reacting the substituted thiazoline with a substituted oxazolidinone represented by Structural Formula (IV): wherein X is an aryl or an arylalkyl group, thereby forming a compound represented by Structural Formula (V): c) alkylating the product of step (b) with R 2 Y in the presence of a base in a polar, aprotic solvent, wherein R 2 is as defined above and Y is a leaving group; thereby forming a compound represented by Structural Formula (VI): wherein R 2 is as defined above; and d) hydrolyzing the product of step (c), thereby forming the compound represented by Structural Formula (I).