2-Acyl-3,4-dimethylthiazolium triflates, modelled upon the biologically important 2-acyl thiamine derivatives, react in neutral media specifically with the oxygen atom of N-aryl hydroxylami'nes to give rise to tetrahedral intermediates, which collapse to the O-acyl derivatives under mildly basic conditions.
L. M. Ferreira, A. M. Lobo, S. Prabhakar, M. J. Marcelo-Curto, H. S. Rzepa and M. Y. Yi, J. Chem. Soc., Chem. Commun., 1991, 1127 DOI: 10.1039/C39910001127
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