Sterically Demanding, Zwitterionic Trialkylphosphonium Sulfonates as Air-Stable Ligand Precursors for Efficient Palladium-Catalyzed Cross-Couplings of Aryl Bromides and Chlorides
作者:Kevin Shaughnessy、William Brown、D’Ariel Boykin、M. Sonnier、William Clark、Fallon Brown
DOI:10.1055/s-2008-1067095
日期:——
(DAPPS) are air-stable pre-ligands for aqueous-phase palladium-catalyzedcross-coupling reactions. Both DTBPPS and DAPPS were found to give active catalysts for the Sonogashira coupling of arylbromides I at room temperature and 4-chloroanisole at 80 °C. These ligands also gave effective catalysts for the aqueous-phase Suzuki coupling of arylbromides at room temperature.
3-(二叔丁基鏻)丙磺酸盐 (DTBPPS) 和 3-(二金刚烷基鏻)丙磺酸盐 (DAPPS) 是用于水相钯催化交叉偶联反应的空气稳定预配体。发现 DTBPPS 和 DAPPS 在室温下为芳基溴化物 I 和 80 °C 下的 4-氯苯甲醚的 Sonogashira 偶联提供活性催化剂。这些配体还为室温下芳基溴化物的水相 Suzuki 偶联提供了有效的催化剂。