1,3-Dipolar cycloadditions with alkynyl phenyl sulphones

Abstract
Alkynyl phenyl sulphones (4) react with the nitrile oxide (1), the nitrile imine (2), and sydnone (3) to afford predominantly or exclusively 4-phenylsulphonyl substituted cycloadducts (5), (7), and (9). The observed regioselectivity is discussed.

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