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Due to the uniqueness of fluorine atom and C-F bond, difluoromethylene has special properties. As a bioisostere of an oxygen or a carbonyl group, it plays an important role in medicines, pesticides and materials. Difluoromethyl heteroaryl sulfones, represented by 2-PySO 2 CF 2 H (Hu reagent), have been developed recently as difluoromethylation reagents, and widely recognized by synthetic chemists for their ease of preparation, good functional group tolerance and universal applicability to adoi:10.6023/cjoc201903063 fatcat:s5s37m7xj5ccxnahhf6slidl3a