During the synthesis of the oxazol-5-one derivative (2) of t-butoxycarbonyl-glycyl-2,3-didehydrophenylalanine, the unexpected side product the 2-methoxyoxazol-5-one (3) was isolated and subsequently characterized by n.m.r., i.r., and single-crystal X-ray diffraction analysis.
A. C. Bach, A. A. Baldwin, L. M. Gierasch and A. L. Rheingold, J. Chem. Soc., Chem. Commun., 1983, 1398 DOI: 10.1039/C39830001398
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