Investigation and mechanistic study into intramolecular hydroalkoxylation of unactivated alkenols catalyzed by cationic lanthanide complexes
作者:Xuehua Zhu、Guoyao Li、Fan Xu、Yong Zhang、Mingqiang Xue、Qi Shen
DOI:10.1016/j.tet.2017.01.051
日期:2017.3
Cationic lanthanide complexes of the type [Ln(CH3CN)9]3+[(AlCl4)3]3–·CH3CN (Ln = Pr, Nd, Sm, Gd, Er, Yb, Y) served as effective catalysts for the intramolecular hydroalkoxylation/cyclization of unactivated alkenols to yield the cyclic ethers with Markovnikov regioselectivity under mild conditions. Novel cationic complexes, [AlCl(CH3CN)5]2+[(AlCl4)2]2–·CH3CN and [Nd(CH3CN)9]3+[(FeCl4)3]3–·CH3CN, were
类型为[Ln(CH 3 CN)9 ] 3+ [(AlCl 4)3 ] 3- ·CH 3 CN(Ln = Pr,Nd,Sm,Gd,Er,Yb,Y)的阳离子镧系元素络合物有效催化剂用于未活化的烯醇的分子内加氢烷氧基化/环化反应,以在温和条件下产生具有马尔可夫尼科夫区域选择性的环状醚。新型阳离子络合物[AlCl(CH 3 CN)5 ] 2+ [(AlCl 4)2 ] 2- ·CH 3 CN和[Nd(CH 3 CN)9 ] 3+ [(FeCl 4)3 ] 3- ·CH 3 CN,合成并评价了未活化的链烯醇的用于比较的分子内hydroalkoxylation /环化。[Nd(CH 3 CN)9 ] 3+ [(FeCl 4)3 ] 3– ·CH 3 CN <[AlCl(CH 3 CN)5 ] 2+ [(AlCl 4)2 ] 2– · CH 3 CN <[Nd(CH 3 CN)9 ] 3+ [(AlCl