Non-metallocene rare earth metal catalysts for the diastereoselective and enantioselective hydroamination of aminoalkenes
作者:Kai C. Hultzsch、Denis V. Gribkov、Frank Hampel
DOI:10.1016/j.jorganchem.2004.11.058
日期:2005.10
summarize our work on new cyclopentadienyl-free rare earth metal catalysts for the diastereoselective and enantioselective hydroamination of aminoalkenes. Non-metallocene rare earth metal catalysts based on diamidoamine, biphenolate and binaphtholate ligands are readily available through alkane and amine elimination procedures. Diamidoamine yttrium complexes are efficient catalysts for the highly diastereoselective
在这篇简短的综述中,我们总结了我们在新型非环戊二烯基稀土金属催化剂上用于氨基烯烃的非对映选择性和对映选择性加氢胺化的工作。基于二酰胺基胺,双酚盐和双萘甲酸酯配体的非金属茂稀土金属催化剂很容易通过烷烃和胺消除程序获得。二氨基胺钇络合物是用于1-甲基-戊-4-烯胺的高度非对映选择性环化以产生反式-2,5-二甲基-吡咯烷的反式与顺式比例高达23:1的有效催化剂。[[((2,6-Et 2 C 6 H 3 NCH 2 CH 2)报道了2 NMe)Y N(SiMe 3)2 }],其中钇以高度扭曲的四面体方式配位。3,3'-二叔丁基取代的双酚盐络合物往往形成酚盐桥连的杂手性和手性二聚体。叔丁基取代基的低空间需求也导致加氢胺化/环化反应中的低对映选择性。具有更苛刻的三(芳基)甲硅烷基取代基的双萘甲酸酯络合物是更有效的催化剂。提供高达83%ee的对映选择性。这些催化剂还可用于手性氨基烯烃的动力学拆分,得到k