The Role of Ligand Transformations on the Performance of Phosphite- and Phosphinite-Based Palladium Catalysts in the Suzuki Reaction
作者:Robin B. Bedford、Samantha L. Hazelwood、Michael E. Limmert、John M. Brown、Shailesh Ramdeehul、Andrew R. Cowley、Simon J. Coles、Michael B. Hursthouse
DOI:10.1021/om020941f
日期:2003.3.1
orthometalated complex [Pd(μ-Cl)κ2-P,C-P(OC6H2-2,4-tBu2)(OC6H3-2,4-tBu2)2}}2] reacts with phenylboronic acid hydrate and K2CO3 in dimethylacetamide to give [Pdκ2-P,C-μ2-O-P(O)(C6H2-2,4-tBu2)(C6H3-2,4-tBu2)(DMAc)}]. When the reaction is repeated in dimethylformamide 3,3‘,5,5‘-tetra-tert-butyl-2,2‘-biphenol is isolated. Both compounds have been characterized crystallographically. The reaction of palladium
的邻位金属化配合物[的Pd(μ-Cl)的κ 2 - P,Ç -P(OC 6 H ^ 2 -2,4-吨卜2)(OC 6 H ^ 3 -2,4-吨卜2)2 } } 2 ]与苯基硼酸水合物和K进行反应2 CO 3在二甲基乙酰胺,得到[钯κ 2 - P,ç -μ 2 - ö -P(O)(C 6 H ^ 2 -2,4-吨卜2) (C 6H 3 -2,4- t Bu 2)(DMAc)}]。当反应在二甲基甲酰胺3,3'被重复,5,5'-四-叔丁基-2,2'-联苯酚是分离的。两种化合物均已通过结晶学表征。二氯化钯与P i Pr 2(OC 6 H 4 -4-Et)在2-甲氧基乙醇中的反应,然后在乙醇的存在下重结晶,导致反式-[PdCl 2 P i Pr 2(OEt)的形成} 2],其也通过晶体学表征。为了确定相关的溶剂分解工艺是否对催化活性有影响,在芳基溴化物的Suzuki偶联中评估了一系列具有“水