Murahashi Cross‐Coupling at −78 °C: A One‐Pot Procedure for Sequential C−C/C−C, C−C/C−N, and C−C/C−S Cross‐Coupling of Bromo‐Chloro‐Arenes
作者:Narayan Sinha、Dorus Heijnen、Ben L. Feringa、Michael G. Organ
DOI:10.1002/chem.201901678
日期:2019.7.11
The coupling of organolithium reagents, including strongly hindered examples, at cryogenic temperatures (as low as −78 °C) has been achieved with high‐reactivity Pd‐NHC catalysts. A temperature‐dependent chemoselectivity trigger has been developed for the selective coupling of aryl bromides in the presence of chlorides. Building on this, a one‐pot, sequential coupling strategy is presented for the
使用高反应性的Pd-NHC催化剂可以在低温(低至-78°C)下偶联有机锂试剂(包括受阻实例)。已开发出一种温度依赖性的化学选择性触发器,用于在氯化物存在下选择性偶联芳基溴化物。在此基础上,提出了一种用于快速构建高级构建基块的单锅顺序耦合策略。重要的是,已经实现了将烷基锂化合物一次性添加到Pd交叉偶联反应中,从而无需通过注射泵缓慢添加。