In the presence of diphosphorus tetraiodide, a variety of weak carboxylic acids readily react with amines to form the corresponding amides in high yields.
在磷酸四碘化物存在下,各种弱羧酸容易与胺反应,生成相应的酰胺,并且产率很高。
Rhodium-Catalyzed Synthesis of Amides from Functionalized Blocked Isocyanates
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
Improvement of catalytic activity of aluminum complexes for the ring-opening polymerization of ε-caprolactone: aluminum thioamidate and thioureidate systems
as high for CL polymerization; [CL] : [USCl-Al] : [BnOH] = 100 : 0.5 : 2; [USCl-Al] = 10 mM, conv. = 90% after 15 min at 25 °C). Regardless of whether aluminum amidates or ureidates were present, thioligands improved the polymerization rate of aluminum catalysts. Density functional theory calculations revealed that the eight-membered ring [SPr-AlOMe2]2 decomposed into the four-membered ring SPr-AlOMe2