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。