Preparation of pseudocyclic I(III) reagents and their application in selective oxidations
Xiangyu Zhan1, Yong You1, Cong Li1
1Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Faculty of Medicine, Tianjin University, Tianjin 300072, China.
None:
Four N,N-disubstituted pseudocyclic-type iodine(III) reagents were conveniently prepared in excellent yields from ortho-iodobenzamides using mCPBA as the oxidant under mild conditions. This class of hypervalent iodine(III) oxidants exhibited remarkable selectivity in oxidizing sulfides solely to sulfoxides, without any detectable sulfone formation, even when used in excess or at elevated temperatures. Mechanistically, the nucleophilic attack of sulfide generates the sulfonium intermediate, which enables the oxidation of sulfides.
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