Organo-photoredox-Catalyzed Selective Mono- and Bis-C–H Alkylation of Electron-Rich (Hetero)Arenes
作者:Shyamal Pramanik、Partha Pratim Mondal、Soumitra Maity
DOI:10.1021/acs.joc.3c01757
日期:2023.11.3
under mild conditions. The extent of alkylation with alkyl bromides was found to be controlled by introducing Zn(OAc)2 as a bromide scavenger, ensuring the blocking of potential bromo-arene byproduct formation under photoredox conditions. In addition, a sequential C–H alkylation strategy for selective bis-alkylation has also been developed via chronological incorporation of different alkyl radical precursors
在此,我们公开了一种利用可见光介导的有机光催化SET过程用烷基溴对富电子(杂)芳烃进行C-H烷基化的简单策略。该方法的通用性已通过在温和条件下包含各种烷基(α-烷基羰基、苄基、氰甲基)以及各种具有生物活性的富电子芳烃和(杂)芳烃得到证明。发现用烷基溴进行烷基化的程度可以通过引入Zn(OAc) 2作为溴化物清除剂来控制,确保阻止光氧化还原条件下潜在的溴代芳烃副产物的形成。此外,通过按时间顺序将不同的烷基自由基前体在一锅中相当有效地结合,还开发了用于选择性双烷基化的顺序C-H烷基化策略。