An efficient, metal-free approach to the synthesis of sulfenylated coumarins based on the iodine catalyzed regioselective sulfenylation of 4-hydroxycoumarins with arylsulfonyl hydrazides was developed under mild conditions in water. Various sulfenylated coumarin derivatives were obtained in good to excellent yields with good functional group tolerance.
Z. Yang, Y. Yan, A. Li, J. Liao, L. Zhang, T. Yang and C. Zhou, New J. Chem., 2018, 42, 14738 DOI: 10.1039/C8NJ03461C
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