Tandem Oxidative Derivatization of Nitrene Insertion Products for the Highly Diastereoselective Synthesis of 1,3-aminoalcohols
作者:Juliet M. Alderson、Jennifer M. Schomaker
DOI:10.1002/chem.201702038
日期:2017.6.27
silver-catalyzed C−H nitrene transfer reaction. Nitrene insertion is followed by facile oxidation of the amine to an imine and nucleophilic addition to furnish α-tertiary amine 1,3-aminoalcohol products in high diastereoselectivities. The silver catalyst, PhIO oxidant, and TEMPO additive are crucial to success in this unusual oxidation, which is proposed to occur via hydrogen-atom abstraction from pre-activation
过渡金属催化的腈插入位于立体碳上的叔CH键中通常会导致非对映异构体产物的混合物,特别是如果反应通过一致的途径进行时。在本交流中,我们报告了对此问题的解决方案,该解决方案涉及一个单锅,银催化的CH腈转化反应。硝基苯插入后,胺容易氧化为亚胺,并进行亲核加成,从而以高非对映选择性提供α-叔胺1,3-氨基醇产物。银催化剂,PhIO氧化剂和TEMPO添加剂对于这种异常氧化的成功至关重要,氧化是通过额外的氧化剂对初始氮插入物进行预活化而使氢原子抽象化而实现的。