通过使用双(二苯基膦甲基)氨基修饰的介孔材料,在温和的条件下,实现了芳基重氮盐与溴化钠或硫醇的高效多相金催化桑德迈尔偶联,以形成 C-Br 和 C-S 键,并具有高产率和选择性。 MCM-41固定氯化金( I )络合物[MCM-41-2Ph 2 PAuCl]作为催化剂,不使用牺牲氧化剂。这种 C-杂原子偶联成功的关键是亲核试剂促进的芳基重氮盐的活化,它可以作为一种有效的氧化剂,在不使用光催化剂或辅助配体的情况下将 Au( I ) 转化为Au ( III )。这种新型多相金( I )配合物可以通过简单的程序轻松制备,并通过离心回收,并循环使用七次以上,而不会显着损失其催化效率。
Highly Efficient and Functional-Group-Tolerant Catalysts for the Palladium-Catalyzed Coupling of Aryl Chlorides with Thiols
作者:Manuel A. Fernández-Rodríguez、Qilong Shen、John F. Hartwig
DOI:10.1002/chem.200600949
日期:2006.10.16
The cross-coupling reaction of arylchlorides with aliphatic and aromatic thiols catalyzed by palladium complexes of the strongly binding bisphosphine CyPF-tBu ligand (1) is reported. Most of the reactions catalyzed by complexes of ligand 1 occur with turnover numbers that exceed those of previous catalysts by two orders of magnitude. The reactions occur with excellent yields, broad scope and high