Cu-Catalyzed Carbon-Heteroatom Coupling Reactions under Mild Conditions Promoted by Resin-Bound Organic Ionic Bases
作者:Yao-Bing Huang、Chu-Ting Yang、Jun Yi、Xiao-Jian Deng、Yao Fu、Lei Liu
DOI:10.1021/jo101917x
日期:2011.2.4
is slightly better than that of the corresponding Cs salts in Cu-catalyzed C−N cross-couplings, while the tetraalkylphosphonium-type RBOIBs are significantly better than all the inorganic bases. With these newly developed RBOIBs, room-temperature Cu-catalyzed C−N coupling with various nonactivated aryl iodides and even aryl bromides can be readily accomplished. Moreover, RBOIBs can be easily recycled
开发了树脂结合的有机离子碱(RBOIBs),其中四烷基铵或阳离子共价连接到固体树脂上。应用测试表明,四烷基铵型RBIOBs在铜催化的C-N交叉偶联中的性能略好于相应的Cs盐,而四烷基phosph型RBIOBs的性能明显优于所有无机碱。 。借助这些新近开发的RBOIB,可以轻松实现室温下Cu催化的CN与各种未活化的芳基碘化物,甚至是芳基溴化物的偶联。而且,RBOBI可以轻松回收再利用多次,而不会造成很多活动。提出RBOIB的良好性能是由于阳离子聚合物主链与碱性阴离子之间的结合力相对较弱,与无机碱中的强金属阴离子相互作用相反。RBOIB在室温下镍催化的Suzuki型偶合,-30°C下的Cu催化的C-N偶合,60°C下的Pd催化的Heck反应以及在室温下的Cu催化的C-S偶合中的进一步应用温度证明了RBOIB是普遍适用的碱,其对许多其他类型的有机转化均具有改善的性能。