MnBr<sub>2</sub>-Catalyzed Direct and Site-Selective Alkylation of Indoles and Benzo[<i>h</i>]quinoline
作者:Rahul A. Jagtap、Suryadev K. Verma、Benudhar Punji
DOI:10.1021/acs.orglett.0c01398
日期:2020.6.19
Manganese-catalyzed regioselective C–H alkylation of indoles and benzo[h]quinoline with a variety of unactivated alkyl iodides is reported. Unlike other Mn-catalyzed C–H functionalization, this protocol does not require a Grignard reagent base and employs a simple and inexpensive MnBr2 as a catalyst. This method tolerates diverse functionalities, including fluoro, chloro, bromo, iodo, alkenyl, alkynyl
据报道,锰催化了吲哚和苯并[ h ]喹啉与多种未活化的烷基碘的区域选择性C–H烷基化反应。与其他Mn催化的C–H功能化不同,该方案不需要格氏试剂碱,而是使用简单且便宜的MnBr 2作为催化剂。该方法耐受多种功能,包括氟,氯,溴,碘,烯基,炔基,吡咯基和咔唑基。烷基化通过单电子转移途径进行,该途径包括可逆的C–H锰离子化并涉及烷基自由基中间体。