我们报告了氨基甲酸酯和尿素衍生物的氢化,这两种最具挑战性的羰基化合物被氢化,首次由地球丰富的金属络合物催化。这些 CO2 衍生化合物的氢化反应在锰钳络合物的催化下产生甲醇以及胺和醇,这使得该方法成为将 CO2 转化为甲醇的可持续两步路线,包括碱-金属催化剂。此外,氢化在温和压力(20巴)下进行。我们的观察结果支持涉及 Mn-H 络合物的氢化机制。基于信息丰富的机械实验提出了一个合理的催化循环。
Formamides as Isocyanate Surrogates: A Mechanistically Driven Approach to the Development of Atom-Efficient, Selective Catalytic Syntheses of Ureas, Carbamates, and Heterocycles
作者:Jeffrey Bruffaerts、Niklas von Wolff、Yael Diskin-Posner、Yehoshoa Ben-David、David Milstein
DOI:10.1021/jacs.9b08942
日期:2019.10.16
dehydrogenative coupling reactions. The design of these highly atom-efficient procedures was driven by the identification and characterization of the relevant organometallic complexes, uniquely exhibiting the trapping of an isocyanateintermediate. DFT calculations further contributed to shed light on the remarkably orchestrated chain of catalytic events, involving metal-ligand cooperation.
Manganese Catalyzed Hydrogenation of Carbamates and Urea Derivatives
作者:Uttam Kumar Das、Amit Kumar、Yehoshoa Ben-David、Mark A. Iron、David Milstein
DOI:10.1021/jacs.9b05591
日期:2019.8.21
We report the hydrogenation of carbamates and ureaderivatives, two of the most challenging carbonyl compounds to be hydrogenated, catalyzed for the first time by a complex of an earth-abundant-metal. The hydrogenation reaction of these CO2-derived compounds, cata-lyzed by a manganese pincer complex, yields methanol in addition to amine and alcohol, which makes this methodology a sustainable two-step
我们报告了氨基甲酸酯和尿素衍生物的氢化,这两种最具挑战性的羰基化合物被氢化,首次由地球丰富的金属络合物催化。这些 CO2 衍生化合物的氢化反应在锰钳络合物的催化下产生甲醇以及胺和醇,这使得该方法成为将 CO2 转化为甲醇的可持续两步路线,包括碱-金属催化剂。此外,氢化在温和压力(20巴)下进行。我们的观察结果支持涉及 Mn-H 络合物的氢化机制。基于信息丰富的机械实验提出了一个合理的催化循环。