we herein report a general method based on PdI that allows for an a priori predictable chemoselective Csp2 -Csp2 coupling at C-Br in preference to C-OTf and C-Cl bonds, regardless of the electronic or steric bias of the substrate. The C-C bond formations are extremely rapid (<5 min at RT) and are catalyzed by an air- and moisture-stable PdI dimer under open-flask conditions.
尽管Pd0催化的偶联反应中的
化学选择性通常是不直观的,并且是
配体/催化剂,底物和反应条件之间复杂相互作用的结果,但我们在此报告了一种基于PdI的通用方法,该方法可实现事先可预测的
化学选择性Csp2- Csp2在C-Br处的偶联优先于C-OTf和C-Cl键,而与底物的电子或空间偏压无关。CC键的形成非常快(在RT下<5分钟),并在开瓶条件下被空气和
水分稳定的PdI二聚体催化。