(Z)-5-(Phenylselenomethylene)pyrrol-2-ones 18–22 have been obtained in good yields from the cyclization of ω-seleno-substituted alkynyl amides 11–15 with ButOK–18-crown-6.
M. Yoshimatsu, K. Machida, T. Fuseya, H. Shimizu and T. Kataoka, J. Chem. Soc., Perkin Trans. 1, 1996, 1839 DOI: 10.1039/P19960001839
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