Synthesis of 2,2-diaryl-1,1-difluoroethenes via Pd-catalyzed dehydrosulfonylative cross-coupling of α-[difluoro(phenylsulfonyl)methyl]benzyl tosylates with arylboronic acids
作者:Rui Zhang、Chuanfa Ni、Yanchuan Zhao、Jinbo Hu
DOI:10.1016/j.tet.2018.04.054
日期:2018.9
By using PhSO2CF2H as the difluoromethylidene equivalent, a novel method for connecting aromatic aldehydes and arylboronic acids via consecutive reactions was developed to obtain structurally diverse 2,2-diaryl-1,1-difluoroethenes. The key step is the palladium-catalyzed dehydrosulfonylative cross-coupling of tosylates that are prepared from PhSO2CF2H, aromatic aldehydes and tosyl chloride. Mechanistic
通过使用PhSO 2 CF 2 H作为二氟亚甲基当量,开发了一种通过连续反应连接芳族醛和芳基硼酸的新方法,从而获得结构上不同的2,2-二芳基-1,1-二氟乙烯。关键步骤是由PhSO 2 CF 2 H,芳族醛和甲苯磺酰氯制备的甲苯磺酸酯的钯催化脱氢磺酰化交叉偶联。机理研究表明,该反应主要通过碱介导的脱氢磺酰化反应,然后通过钯催化的C(sp 2)-C(sp 2)交叉偶联反应进行。