Asymmetric synthesis of both enantiomers of syn-(3-trifluoromethyl)cysteine derivatives

The use of several chiral trifluoromethylated building blocks 1a, 1b, 9a and 9b was attempted to synthesize of syn-(3-trifluoromethyl)cysteine. A novel and efficient enantioselective synthesis of both enantiomers of syn-(3-trifluoromethyl)cysteine derivatives 12a and 12b was successfully achieved.