alpha-Trifluoromethyl-substituted alpha-amino acid esters 1 give N-formyl alpha-trifluoromethyl alpha-amino acid esters 2 on reaction with formic acid/acetic anhydride. 3,3,3-Trifluoro-2-isocyanopropionates 3 are obtained from 2 upon treatment with diphosgene/triethylamine.
Burger, Klaus; Schierlinger, Christian; Hollweck, Wolfgang, Liebigs Annalen der Chemie, 1994, # 4, p. 399 - 406