Some substituted 2-methylenepenams have been synthesised by ring closure of acetylenic azetidinone-thiols. Substituents on the methylene group include aryl, hydroxymethyl, and alkoxycarbonylvinyl.
E. G. Brain, N. J. P. Broom and R. I. Hickling, J. Chem. Soc., Perkin Trans. 1, 1981, 892 DOI: 10.1039/P19810000892
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