A four-component reaction of aryldiazonium tetrafluoroborates, sulfur dioxide, 1,2-dibromoethane, and hydrazines under metal-free conditions is described, providing a novel and efficient approach to 2-arylsulfonyl hydrazones. This transformation proceeds smoothly via insertion of sulfur dioxide under mild conditions with good functional group tolerance.
D. Zheng, Y. Kuang and J. Wu, Org. Biomol. Chem., 2015, 13, 10370 DOI: 10.1039/C5OB01765C
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