Reaction of N-Benzoyl Amino Acids with Oxalyl Chloride: A Facile Route to 4-Substituted 2-Phenyloxazole-5-carboxylates.

N-benzoyl amino acids 1a–g react with excess oxalyl chloride at room temperature followed by addition of alcohols to afford 4-substituted 2-phenyloxazole-5-carboxylates 3a–g.