Ethyl propiolate and dimethyl acetylenedicarboxylate activated by AlCl3 react with 2-bromothiazole to give, after quenching with aqueous NaHCO3 or PhCH2NH2, N-vinylthiazolin-2-ones and 2-benzylimino-N-vinylthiazolines respectively.
A. Medici, P. Pedrini, M. Fogagnolo and A. Dondoni, J. Chem. Soc., Chem. Commun., 1980, 1077 DOI: 10.1039/C39800001077
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