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.
T. Cynkowski, G. Cynkowska, P. Ashton and P. A. Crooks, J. Chem. Soc., Chem. Commun., 1995, 2335 DOI: 10.1039/C39950002335
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