Triethyl phosphite reacts with o-azidophenyl esters to give 2-substituted benzoxazoles via phosphorimidate intermediates, but a comparison with the corresponding reaction of o-nitrophenyl esters suggests different mechanisms for these two reactions.
L. J. Leyshon and D. G. Saunders, J. Chem. Soc. D, 1971, 1608 DOI: 10.1039/C29710001608
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