Palladium-catalyzed highly regioselective and stereoselective arylation of electron-rich allylamines with aryl bromides
作者:Zhen Jiang、Lingjuan Zhang、Chaonan Dong、Baode Ma、Weijun Tang、Lijin Xu、Qinghua Fan、Jianliang Xiao
DOI:10.1016/j.tet.2012.02.081
日期:2012.6
excellent yields. It was found that the choice of solvent, olefin, additive and temperature has an important influence on the reaction. Worthy of note is that good results were observed only when using N,N-diprotected allylamines containing carbamate moiety, and the steric properties of allylamines also have important impacts on the regiocontrol. The use of TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy) or HQ
在无配体的条件下,已开发出钯催化的,富电子的N,N-二保护烯丙基胺衍生物与各种芳基溴化物的高效Heck芳基化反应。在Pd(OAc)2和合适的添加剂存在下,反应以极好的区域选择性和立体选择性进行,从而仅以良好的产率至优异的产率产生了γ-芳基化的(E)-烯丙胺产物。发现溶剂,烯烃,添加剂和温度的选择对反应有重要影响。值得注意的是,仅当使用N,N时,才能观察到良好的结果。-含有氨基甲酸酯部分的双保护的烯丙胺,以及烯丙胺的空间性质也对区域控制具有重要影响。使用TEMPO(2,2,6,6-四甲基-1-哌啶基氧基)或HQ(对苯二酚)作为添加剂对于确保更快的反应速度也至关重要。该方法提供了一种直接合成各种γ-芳基化,线性(E)-烯丙胺的直接方法。