| abstract |
A process for stereoselective synthesis of a compound of Formula (X) or Formula (X') wherein R 1 is an aryl group substituted with one to three substituent groups, wherein each substituent group of R 1 is independently C 1 -C 5 alkyl, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl, halogen, carboxy, cyano, or trifluoromethyl, wherein each substituent group of R 1 is optionally independently substituted with one to three substituents selected from C 1 -C 3 alkyl, C 1 -C 3 alkoxy, phenyl, and alkoxyphenyl; and R 2 and R 3 are each independently C 1 -C 5 alkyl. |