Palladium-Catalyzed Amidation and Amination of (Hetero)aryl Chlorides under Homogeneous Conditions Enabled by a Soluble DBU/NaTFA Dual-Base System
作者:Gregory L. Beutner、John R. Coombs、Rebecca A. Green、Bahar Inankur、Dong Lin、Jun Qiu、Frederick Roberts、Eric M. Simmons、Steven R. Wisniewski
DOI:10.1021/acs.oprd.9b00196
日期:2019.8.16
The palladium-catalyzed coupling of aryl and heteroaryl chlorides with primary amides under mild homogeneous reaction conditions is reported. Successful C–N coupling is enabled by the use of a unique “dual-base” system consisting of DBU and NaTFA, which serve as proton acceptor and halide scavenger, respectively, using low catalyst loadings (0.5 mol %) with readily available, air-stable palladium precatalysts
据报道,在温和的均相反应条件下,钯催化的芳基和杂芳基氯化物与伯酰胺的偶联反应。通过使用独特的“双碱”系统(包括DBU和NaTFA)可实现成功的C-N偶联,这两种系统分别用作质子受体和卤化物清除剂,并使用低催化剂负载量(0.5 mol%)和易于获得的空气稳定的钯预催化剂。DBU / NaTFA系统还可以使芳基伯胺与芳基氯在室温下偶联,并且可以耐受多种对碱敏感的官能团。