M. Kawase, A FACILE ONE-POT SYNTHESIS OF 5-TRIFLUOROMETHYLOXAZOLES AND 5-PERFLUOROALKYLOXAZOLES FROM N-ALKYL-N-ACYLAMINO ACIDS, Heterocycles, 36(11), 1993, pp. 2441-2444
The reaction of N-acyl-N-benzyl-alpha-amino acids with trifluoroacetic
or perfluorocarboxylic anhydride in the presence of pyridine affords
5-trifluoromethyl- or 5-perfluoroalkyloxazoles in high yields.