Patent ID: 6916932

Claim:
A process comprising reacting compound GF-I with a reducing agent to form compound GF-II wherein Y is selected from the group consisting off H, benzyl, substituted benzyl, CH 2 OC 1-8 alkyl, CH 2 OC 3-8 cycloalkyl, allyl, tetrahydropyranyl, tetra-hydrofuranyl, substituted tetrahydropyranyl, substituted tetrahydrofuranyl, Si(C 1-4 alkyl) 3 , and Si(Ph) x (C 1-4 alkyl) 3 where x is equal to 1, 2, or 3; and wherein said process is conducted: (a) in the presence of a reducing agent; (b) in the presence of an aprotic solvent: and (c) at a temperature from about −80° C. to about 50° C.