4′-Nitrobenzenesulphenanilide and its N-methyl derivative react with alkynes in the presence of boron trifluoride–diethyl ether presumably affording thiirenium ion intermediates, which are trapped by acetonitrile to give eventually β-acetamidinovinyl sulphides.
L. Benati, P. C. Montevecchi and P. Spagnolo, J. Chem. Soc., Chem. Commun., 1987, 1050 DOI: 10.1039/C39870001050
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