作者:Hong-Hai Zhang、Cai-Xia Wang、Fei-Fei Sheng、Kai-Hui Liu、Jian-Guo Gu、Kang Shen、Zheng-Yi Sun、Kunlun Hong
DOI:10.1055/a-1838-8958
日期:2022.9
Direct β-arylation of thiophene derivatives with bromide as directing group is disclosed. The reaction is conducted with PdCl2/(p-tolyl)3P as catalyst, silver carbonate as additive, and aryl iodide as coupling partner, affording brominated biaryl compounds as product. Control experiments indicated that the presence of bromide group enhances the reactivity of the C–H bond, enabling β-arylation. Furthermore
公开了用溴化物作为导向基团的噻吩衍生物的直接β-芳基化。该反应以PdCl 2 /(对甲苯基) 3 P为催化剂,碳酸银为添加剂,芳基碘化物为偶联剂进行,得到溴代联芳基化合物作为产物。对照实验表明溴化物基团的存在增强了 C-H 键的反应性,使 β-芳基化成为可能。此外,C-Br 键可以通过多种方法轻松转化为许多有用的官能团。机理研究表明,银盐在 C-H 键活化步骤中起关键作用。