Palladium-Catalyzed Coupling of Biphenyl-2-yl Trifluoromethanesulfonates with Dibromomethane to Access Fluorenes
作者:Yanghui Zhang、Shulei Pan、Qiongqiong Zhu
DOI:10.1055/a-1770-1078
日期:2022.11
A facile and efficient method has been developed for the synthesis of fluorenes by Pd-catalyzed C–H alkylation of biphenyl-2-yl trifluoromethanesulfonates. The trifluoromethanesulfonates are more readily available and more environmentally benign than biphenyl iodides, and are advantageous substrates for traceless directing-group-assisted C–H activation. The reaction generates C,C-palladacycles as the
已经开发了一种通过 Pd 催化的 C-H 烷基化联苯-2-基三氟甲磺酸盐来合成芴的简便有效的方法。三氟甲磺酸盐比联苯碘化物更容易获得且对环境更友好,并且是无痕导向基团辅助 C-H 活化的有利底物。该反应生成 C,C-钯环作为关键中间体,通过与 CH2Br2 反应形成两个 C(sp2)–C(sp3) 键。该反应允许各种官能团,从而可以轻松获得一系列芴衍生物。