Patent ID: 8124794

Claim:
A compound of the Formula VI: wherein R 1 is cyclopentyl, cyclohexyl, benzyl, CO 2 Me or MeO—(CH 2 ) 9 —; R 2 , R 3 and R 4 comprises a hydrogen, an alkyl group, a cycloalkyl group, a heterocycloalkyl group, an alkoxy group, a hydroxyalkyl group, a halogenated alkyl group, an alkoxyalkyl group, an alkenyl group, an alkynyl group, an aryl group, a heteroaryl group, an aralkyl group, a hydroxy group, an amine group, an amide, an ester, a carbonate group, a carboxylic acid, an aldehyde, a keto group, an ether group, a halide, a urethane group, a silyl group, a sulfo-oxo group, or a combination thereof; wherein R 2 is not phenyl or methyl when R 1 is benzyl or —CO 2 Me; and wherein the stereochemistry at carbons a and b is R or S.