Direct C-H bond (Hetero)arylation of thiazole derivatives at 5-position catalyzed by N-heterocyclic carbene palladium complexes at low catalyst loadings under aerobic conditions
作者:Bei-Bei Ma、Xiao-Bing Lan、Dong-Sheng Shen、Feng-Shou Liu、Chang Xu
DOI:10.1016/j.jorganchem.2019.06.016
日期:2019.10
synthesis of 5-(hetero)arylated thiazole derivatives via an N-heterocyclic carbene palladium (Pd-NHC) complex catalyzed direct C-H arylation reaction. Utilization of this methodology, the arylation of substituted thiazoles with (hetero)aryl bromides efficiently proceeded at low catalyst loading (0.1–0.05 mol%) and under aerobic conditions. A variety of (hetero)aryl bromides, even some strongly deactivated
已经开发了一种高效且实用的方案,用于通过N-杂环卡宾钯(Pd-NHC)络合物催化的直接CH芳基化反应合成5-(杂)芳基噻唑衍生物。利用这种方法,在低催化剂负载量(0.1–0.05 mol%)和好氧条件下,取代的噻唑与(杂)芳基溴化物的芳基化反应有效进行。在最佳反应条件下,各种具有广泛官能团的(杂)芳基溴化物,甚至一些高度失活或高度拥挤的(杂)芳基溴化物均相容。在所有情况下,目标产品的产量均中等至定量。