作者:Joshua S. Derasp、André M. Beauchemin
DOI:10.1021/acscatal.9b02641
日期:2019.9.6
Isocyanates are useful building blocks for the synthesis of amides, although their widespread use has been limited by their high reactivity, which often results in poor functional group tolerance and a propensity to oligomerize. Herein, a rhodium-catalyzed synthesis of amides is described coupling boroxines with blocked (masked) isocyanates. The success of the reaction hinges on the ability to form
异氰酸酯是酰胺合成的有用组成部分,尽管它们的广泛使用受到其高反应性的限制,这通常导致较差的官能团耐受性和低聚倾向。在本文中,描述了铑催化的酰胺的合成,其将环硼氧烷与封闭的(被掩蔽的)异氰酸酯偶联。反应的成功取决于原位形成异氰酸酯和有机铑中间体的能力。依赖于掩蔽的异氰酸酯前体和有机铑中间体的高反应性,可实现宽泛的官能团耐受性,包括质子亲核基团(如胺,苯胺和醇)。