1622432-93-2Relevant academic research and scientific papers
Enhancement of neighbouring-group participation in Cu0-promoted cross-coupling gem-difluoromethylenation of aryl/alkenyl halides with 1,3-azolic difluoromethyl bromides
Jiang, Haizhen,Lu, Wenjun,Yang, Kun,Ma, Guobin,Xu, Minjun,Li, Jian,Yao, Jianhua,Wan, Wen,Deng, Hongmei,Wu, Shaoxiong,Zhu, Shizheng,Hao, Jian
, p. 10084 - 10092 (2014/08/18)
A copper(0)-promoted direct reductive gem-difluoromethylenation of unactivated aryl or alkenyl halides with benzo-1,3-azolic (oxa-, thia- or aza-) difluoromethyl bromides or 2-bromodifluoromethyl-1,3-oxazoline has been developed for the construction of pharmaceutically important gem-difluoromethylene-linked twin molecules. The unique π-conjugated aryl-fused 1,3-azolic moiety in difluoromethyl bromide substrates could stabilise the reaction intermediates, which promotes the reactivities, providing facile access to the cross-coupling products in good to excellent yields, and allowing significant functional group tolerance. The reaction exhibits an enhanced neighbouring-group-participation effect. This method could provide a new strategy for the construction of gem-difluoromethylene-linked identical or nonidentical twin drugs through further functionalisation of 1,3-azolic skeletons.
