Formaldehyde as Tethering Organocatalyst: Highly Diastereoselective Hydroaminations of Allylic Amines
作者:Colin R. Hesp、Melissa J. MacDonald、M. Mehdi Zahedi、Didier A. Bilodeau、Shu-Bin Zhao、Marc Pesant、André M. Beauchemin
DOI:10.1021/acs.orglett.5b02675
日期:2015.10.16
Catalysts possessing sufficient activity to achieve intermolecular alkene hydroaminations under mild conditions are rare, and this likely accounts for the scarcity of asymmetric variants of this reaction. Herein, highly diastereoselective hydroaminations of allylic amines utilizing hydroxylamines as reagents and formaldehyde as catalyst are reported. This catalyst induces temporary intramolecularity
具有在温和条件下实现分子间烯烃加氢胺化的足够活性的催化剂是罕见的,这可能解释了该反应的不对称变体的稀缺性。在本文中,报道了利用羟胺作为试剂和甲醛作为催化剂的烯丙基胺的高度非对映选择性加氢胺化。该催化剂引起暂时的分子内分子化,这导致高速率加速,以及通过手性烯丙基胺或手性羟胺的高非对映异构控制。反应范围包括内部烯烃。总的来说,这项工作为形成复杂的邻位二胺提供了一种新的,立体控制的途径。