Visible Light-Catalyzed Benzylic C–H Bond Chlorination by a Combination of Organic Dye (Acr<sup>+</sup>-Mes) and <i>N</i>-Chlorosuccinimide
作者:Ming Xiang、Chao Zhou、Xiu-Long Yang、Bin Chen、Chen-Ho Tung、Li-Zhu Wu
DOI:10.1021/acs.joc.0c01000
日期:2020.7.17
By combining “N-chlorosuccinimide (NCS)” as the safe chlorine source with “Acr+-Mes” as the photocatalyst, we successfully achieved benzylic C–H bond chlorination under visible light irradiation. Furthermore, benzylic chlorides could be converted to benzylic ethers smoothly in a one-pot manner by adding sodium methoxide. This mild and scalable chlorination method worked effectively for diverse toluene
通过将作为安全氯源的“ N-氯琥珀酰亚胺(NCS)”与作为光催化剂的“ Acr + -Mes”相结合,我们在可见光照射下成功实现了苄基C–H键氯化。此外,通过加入甲醇钠可以一锅法将苄基氯平稳地转化为苄基醚。这种温和且可扩展的氯化方法可有效地用于多种甲苯衍生物,尤其是对于缺电子的底物。仔细的机理研究表明,NCS提供了一个氢抽象剂“ N-中心的琥珀酰亚胺基”,该基团依赖于Acr • -Mes的还原能力来裂解苄基的C–H键。