A three-component reaction of 2-(allyloxy)anilines, sulfur dioxide and hydrazines under mild conditions is developed, which gives rise to 1-(2,3-dihydrobenzofuran-3-yl)-methanesulfonohydrazides in good yields. This radical process involves an intramolecular 5-exo-cyclization and insertion of sulfur dioxide.
Y. An, D. Zheng and J. Wu, Chem. Commun., 2014, 50, 11746 DOI: 10.1039/C4CC05401F
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