A Palladium Bipyridyl Complex Grafted onto Nanosized MCM-41 as a Heterogeneous Catalyst for Negishi Coupling
作者:Wei-Yi Wu、Tze-Chiao Lin、Tamotsu Takahashi、Fu-Yu Tsai、Chung-Yuan Mou
DOI:10.1002/cctc.201200388
日期:2013.4
The Negishi coupling of aryl bromides or acyl chlorides with organozinc chlorides catalyzed by a palladium bipyridyl complex anchored on nanosized mobile crystalline material 41 (MCM‐41) were investigated. The reactions proceeded smoothly with a very low catalyst loading in THF at 70 °C for electron‐deficient aryl bromides, which gave good to high yields of the Negishi coupling products. However, reactions
研究了芳基溴化物或酰氯与锚固在纳米级可移动晶体材料41(MCM-41)上的钯联吡啶配合物催化的有机锌氯化物的Negishi偶联反应。对于缺电子的芳基溴化物,在70°C的THF中催化剂负载量非常低时,反应可以顺利进行,这使Negishi偶联产物的收率达到了很高的水平。但是,如果使用富电子芳基溴化物,则需要在甲苯中于110°C下反应。对于酰氯,反应可以在THF中于50°C进行,并以高收率获得了相应的酮和炔酮。离心后,可以容易地从反应混合物中回收负载的催化剂,并且可以将其重复使用数次,而无需任何重新处理或再生,而仅使活性稍微降低。