Metal-Free, Mild, Nonepimerizing, Chemo- and Enantio- or Diastereoselective N-Alkylation of Amines by Alcohols via Oxidation/Imine–Iminium Formation/Reductive Amination: A Pragmatic Synthesis of Octahydropyrazinopyridoindoles and Higher Ring Analogues
作者:Imran A. Khan、Anil K. Saxena
DOI:10.1021/jo4012249
日期:2013.12.6
A mild step and atom-economical nonepimerizing chemo- and enantioselective N-alkylating procedure has been developed via oxidation/imine–iminium formation/reduction cascade using TEMPO–BAIB–HEH–Brønsted acid catalysis in DMPU as solvent and a stoichiometric amount of amine. The optimized conditions were further extended for the nonenzymatic kinetic resolution of the chiral amine thus formed under nonenzymatic
通过在DMPU中使用TEMPO-BAIB-HEH-Brønsted酸催化作为溶剂和化学计量的胺,通过氧化/亚胺-亚胺形成/还原级联反应,开发了一种温和的步骤以及原子经济的非三聚化学和对映选择性N-烷基化方法。优化的条件进一步扩展为使用VAPOL衍生的磷酸(VAPOL-PA)作为布朗斯台德酸催化剂在非酶原位氢转移条件下形成的手性胺的非酶动力学拆分。所呈现的反应的对映选择性级联被成功地用于在octahydropyrazinopyridoindole的合成和其较高的环类似物。