N,N-Dialkylation of Acyl Hydrazides with Alcohols Catalyzed by Amidato Iridium Complexes via Borrowing Hydrogen
作者:Wan-Hui Wang、Wei-Yu Shao、Jia-Yue Sang、Xu Li、Xiaoqiang Yu、Yoshinori Yamamoto、Ming Bao
DOI:10.1021/acs.organomet.3c00026
日期:2023.9.25
Direct N,N-dialkylation of acyl hydrazide catalyzed by a series of amidato iridium complexes bearing an electron-donating group in the ligand using methanol or ethanol as the alkyl reagent under weak base conditions (10 mol % KHCO3) is described. A wide range of acyl hydrazide derivatives are converted to the corresponding N,N-dialkylated products in excellent yields (38 examples, yields of ≤96%).
描述了在弱碱条件(10 mol% KHCO 3)下,使用甲醇或乙醇作为烷基试剂,由一系列配体中带有给电子基团的酰胺铱络合物催化酰肼的直接N,N-二烷基化反应。多种酰肼衍生物均以优异的收率转化为相应的 N,N-二烷基化产物(38 个实例,收率≤96%)。在对照实验和核磁共振研究的基础上,提出了一种合理的机制。实验结果表明,吡啶甲酰胺配体的苯基部分上的邻位给电子基团在催化活性中起着至关重要的作用。