A Biphasic Medium Slows Down the Transfer Hydrogenation and Allows a Selective Catalytic Deuterium Labeling of Amines from Imines Mediated by a Ru−H/D<sup>+</sup>Exchange in D<sub>2</sub>O
作者:Margarita Ruiz‐Castañeda、M. Carmen Carrión、Lucía Santos、Blanca R. Manzano、Gustavo Espino、Félix A. Jalón
DOI:10.1002/cctc.201801343
日期:2018.12.7
The transfer hydrogenation (TH) of several aldimines has been studied using [RuCl(p‐cymene)(dmbpy)]BF4, 1, (dmbpy=4,4′‐dimethyl‐2,2′‐bipyridine) as a precatalyst. Both neat water and a biphasic water/toluene mixture (w/t) have been successfully used as solvents. In the w/t medium the corresponding precursors, amine and aldehyde, were also used as substrates for a transfer hydrogenative reductive amination
几个醛亚胺的转移氢化(TH)已使用将[RuCl(研究p -cymene)(dmbpy)] BF 4,1,(dmbpy = 4,4'-二甲基-2,2'-联吡啶)作为前段催化剂。纯水和水/甲苯两相混合物(重量/吨)均已成功用作溶剂。在w / t介质中,相应的前体胺和醛也用作转移氢化还原胺化的底物。所得烷基化胺的选择性氘标记是这项工作的主要目标。使用D 2 O时,胺中的D含量可以忽略不计,但D 2中的D掺入量很高O /甲苯。根据计算,这是由于氢化物转移的相对速率和RuH / D +交换的相对速率的影响。随着底物浓度降低,氢化物转移速率降低,氘的掺入量随时间增加。进行的可回收性分析反映了pH在TH对亚胺或亚胺水解产生的醛的亚胺或醛的选择性中的重要性。