Microtubing-Reactor-Assisted Aliphatic C−H Functionalization with HCl as a Hydrogen-Atom-Transfer Catalyst Precursor in Conjunction with an Organic Photoredox Catalyst
作者:Hong-Ping Deng、Quan Zhou、Jie Wu
DOI:10.1002/anie.201804844
日期:2018.9.24
Chlorine radical, which is classically generated by the homolysis of Cl2 under UV irradiation, can abstract a hydrogen atom from an unactivated C(sp3)−H bond. We herein demonstrate the use of HCl as an effective hydrogen‐atom‐transfer catalyst precursor activated by an organic acridinium photoredox catalyst under visible‐light irradiation for C−H alkylation and allylation. The key to success relied
氯自由基通常是由Cl 2在紫外线照射下均质化而产生的,它可以从未激活的C(sp 3)-H键中提取氢原子。我们在本文中证明了使用HCl作为有机hydrogen啶氧化还原催化剂在可见光照射下活化C-H烷基化和烯丙基化的有效氢原子转移催化剂前体。成功的关键在于利用微管反应器来维持挥发性HCl催化剂。这种基于氯的光介导的C-H活化方案对多种未活化的C(sp 3)-H键模式均有效,即使是主要的C(sp 3)-H键,如乙烷。快速获取大量未官能化烷烃原料中的几种药物说明了该策略的优点。