Synthesis of cobalt-containing monodentate phosphine ligand and application toward Suzuki cross-coupling reactions
作者:Fung-E Hong、Yi-Jung Ho、Yu-Chang Chang、Yi-Luen Huang
DOI:10.1016/j.jorganchem.2004.11.030
日期:2005.3
[(μ-PPh2CH2PPh2)Co2(CO)4](μ,η-PhCCPCy2) (4), was prepared from the reactions of the bis(diphenylphosphino)methylene (dppm)-bridged dicobalt complex Co2(CO)6(μ-Ph2PCH2PPh2) (2) with PhCCPCy2 (3). Combination of 4 and Pd(OAc)2 (1:1) gave an active catalyst for the palladium-catalyzed Suzuki coupling of aryl bromides with phenylboronic acid; the catalytic reactions can be performed even under low catalyst loadings (0
甲笨重,二钴复合的,单齿膦,[(μ-PPH 2 CH 2 PPH 2)有限公司2(CO)4 ](μ,η-PhCCPCy 2)(4),从该双反应制备(二苯基膦基)亚甲基(DPPM)-bridged羰基二钴复合物共2(CO)6(μ-PH 2 PCH 2 PPH 2)(2)配有PhCCPCy 2(3)。的组合4和Pd(OAc)2(1∶1)为钯催化的芳基溴化物与苯基硼酸的铃木偶联反应提供了一种活性催化剂。即使在低催化剂负载量(0.1-0.001 mol%4 / Pd(OAc)2)下也可以进行催化反应。已经证明化合物4是真实有效的单齿膦配体。还研究了至关重要的因素,例如4 / Pd(OAc)2的比例,所使用的碱,溶剂体积,温度以及芳基溴化物在反应中的电子变化,并报告了结果。