Visible Light-Induced Photoredox Construction of Trifluoromethylated Quaternary Carbon Centers from Trifluoromethylated Tertiary Bromides
作者:Feng Huan、Qing-Yun Chen、Yong Guo
DOI:10.1021/acs.joc.6b00930
日期:2016.8.19
prolonged reaction times. For aliphatic alkenes, the reactions were neither thermodynamic nor kinetic and fac-Ir(ppy)3 was used as catalyst. Thus, reactions were not as efficient as electron-rich alkenes. The atom-transfer radical addition reactions of trifluoromethylated tertiary bromides with alkynes were also achieved. The configuration of products we separated was E type only. Some of the products exhibited
已经开发了一种温和的,操作简单的,可见光诱导的光氧化还原方法,用于从三氟甲基化的叔溴化物中构建新型的三氟甲基化的季碳中心。使用这种方法,多种烯烃成功地双官能化为γ-丁内酰胺。对于富电子烯烃,Ir(dF(CF 3)ppy)2(dtbbpy)(PF 6)催化的反应是动力学过程,产率高,反应时间短。对于苯乙烯,由Ir(ppy)2(dtbbpy)(PF 6)催化的反应是热力学过程,具有中等收率和延长的反应时间。对于脂族烯烃,反应既不是热力学也不是动力学,反应是fac -Ir(ppy)3用作催化剂。因此,反应不如富电子烯烃有效。还实现了三氟甲基化叔溴化物与炔烃的原子转移自由基加成反应。我们分离的产品配置仅为E型。一些产品表现出杀菌活性。