Ni-Catalyzed α-Alkylation of Unactivated Amides and Esters with Alcohols by Hydrogen Auto-Transfer Strategy
作者:Siba P. Midya、Jagannath Rana、Jayaraman Pitchaimani、Avanashiappan Nandakumar、Vedichi Madhu、Ekambaram Balaraman
DOI:10.1002/cssc.201801443
日期:2018.11.23
A transition‐metal‐catalyzed borrowing hydrogen/hydrogen auto‐transfer strategy allows the utilization of feedstock alcohols as an alkylating partner, which avoids the formation of stoichiometric salt waste and enables a direct and benign approach for the construction of C‐N and C−C bonds. In this study, a nickel‐catalyzed α‐alkylation of unactivated amides and ester (tert‐butyl acetate) is carried
过渡金属催化借用的氢/氢自动转移策略允许将原料醇用作烷基化伙伴,从而避免了化学计量盐废物的形成,并为C-N和C-的构建提供了直接而良性的方法C键。在这项研究中,在温和条件下使用伯醇对镍进行了未活化的酰胺和酯(乙酸叔丁酯)的镍催化的α-烷基化反应。这种C-C键形成反应由一种新的分子定义的镍(II)NNN-钳形配合物(0.1-1 mol%)催化,并通过氢自动转移进行,从而释放出水作为唯一的副产物。此外,还证明了在Ni催化条件下环状酰胺的N烷基化作用。