Visible‐Light‐Induced Photoredox 1,1‐Dichloromethylation of Alkenes with Chloroform
作者:Yingjie Cheng、Zhonghua Qu、Shiru Chen、Xiaochen Ji、Guo‐Jun Deng、Huawen Huang
DOI:10.1002/adsc.202200074
日期:2022.4.26
A photoredox 1,1-dichloromethylation of alkenes with the readily available bulk chemical chloroform was described, furnishing a variety of 1,1-dichloroalkane products selectively. Furthermore, this transformation could proceed smoothly on gram-scale, and the obtained products could transform into diverse γ-lactam derivatives with simple treatment. Mechanistically, the single electron transfer (SET)
描述了烯烃的光氧化还原 1,1-二氯甲基化与容易获得的散装化学氯仿,选择性地提供各种 1,1-二氯烷烃产品。此外,这种转化可以在克级上顺利进行,所得产物只需简单处理即可转化为多种γ-内酰胺衍生物。从机理上讲,激发光催化剂的单电子转移 (SET) 和随后的三乙胺去质子化生成关键的 α-氨基自由基中间体,从而实现氯仿的选择性 Cl 原子转移。特定的选择性、广泛的底物范围以及温和的反应条件使该策略特别有吸引力。