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 isocyanate intermediate. DFT calculations further contributed to shed light on the remarkably orchestrated chain of catalytic events, involving metal-ligand cooperation.
尽管异氰酸酯具有危险性,但它们仍然是散装和精细化学品合成的关键组成部分。通过用效力较低且易于获得的甲酰胺前体替代它们,我们在此展示了一种替代的机械方法,通过基于钌的钳形复合物催化的无受体脱氢偶联反应选择性地获得广泛的尿素、氨基甲酸酯和杂环。这些高原子效率程序的设计是由相关有机金属配合物的鉴定和表征驱动的,独特地表现出异氰酸酯中间体的捕获。DFT 计算进一步有助于阐明催化事件的精心编排链,涉及金属-配体合作。