Direct Access to Cumbersome Aminated Quaternary Centers by Hyperbaric Aza-Michael Additions
作者:Alexander Yu. Rulev、Saleha Azad、Hiyoshizo Kotsuki、Jacques Maddaluno
DOI:10.1002/ejoc.201000984
日期:2010.11
addition of secondary amines to α,β- or β,β-disubstituted α,β-unsaturated esters was efficiently achieved under high pressure (10-16 kbar) in protic solvents in the absence of any catalyst. The expected cumbersome β-aminesters bearing a tertiary amine directly connected to a quaternary carbon atom could be isolated in fair to good yields. By using α,β,δ,γ,-unsaturated esters (alkyl sorbate), the addition
在没有任何催化剂的情况下,在质子溶剂中,在高压 (10-16 kbar) 下,仲胺与 α,β- 或 β,β-二取代 α,β-不饱和酯的 aza-Michael 加成反应是有效的。预期的带有直接连接到季碳原子的叔胺的笨重 β-胺酯可以以公平到良好的产率分离。通过使用 α,β,δ,γ,-不饱和酯(山梨酸烷基酯),以 1,6 的方式区域选择性地进行加成,得到 β,γ-不饱和 δ-氨基酯。