Patent ID: 6936714

Claim:
A compound having the formula: wherein R 1 and R 4 is H, a C 1 to C 4 alkyl group, C(O)(C 1 -C 4 alkyl) or additionally R 4 is benzyl; wherein R 2 is H, OH, O(C 1 -C 4 alkyl), O-benzyl, OC(O)H, OC(O)(C 1 -C 4 alkyl), OC(O)benzyl, OSi(CH 1 ) 2 (t-butyl), or a phthalimide group; wherein R 3 is ═O, OH, O(C 1 -C 4 alkyl), OC(O)(C 1 -C 2 alkyl), or OC(O)benzyl; wherein R 5 is H, halogen, OH, or —OC (1-6) alkyl group; wherein R 6 is ═O, OH, OC 3 , CN, OC(O)H, OC(O)(C 1 -C 4 alkyl), or OC(O)benzyl; wherein R 7 , is H, ═O, OH, or halogen; wherein R 8 and R 9 are independently H, CH 3 , OCH 3 , OC 2 H 5 , Br, P, or CF 3 ; wherein R 10 and R 11 are independently CH 3 , OCH 3 , OC 2 H 5 , SCH 3 , or SC 2 H 5 ; wherein R 12 is H, a C 1 to C 4 alkyl group, or C(O)(C 1 -C 4 alkyl); and wherein the chiral center marked * has the R or the S configuration.