Mild, powerful, and robust methods for esterification, amide formation, and thioesterification between acid chlorides and alcohols, amines, thiols, respectively
practical methods for esterification, amideformation, and thioesterification betweenacidchlorides and alcohols, amines, thiols, respectively. The present mild and robust reaction was performed by two separate methods both by combining cheap and readily available amines, N-methylimidazole, and N,N,N′,N′-tetramethylethylenediamine (TMEDA). Method A uses catalytic N-methylimidazole and TMEDA with an
我们开发了两种有效的实用方法,分别用于酰氯与醇,胺,硫醇之间的酯化,酰胺形成和硫酯化。本发明的温和而稳固的反应是通过两种单独的方法进行的,两者都是通过组合廉价且容易获得的胺,N-甲基咪唑和N,N,N ',N'-四甲基乙二胺(TMEDA)。方法A使用等摩尔量的K 2 CO 3催化N-甲基咪唑和TMEDA ,而方法B使用等摩尔量的N-甲基咪唑和TMEDA。其主要特征如下。(i)就反应性而言,方法B在酯化和硫代酯化方面优于方法A,而经济高效的方法A在酰胺形成方面优于方法B。(ii)酰氯与较少亲核和立体拥挤的胺(如2,6-二氯苯胺)之间的酰胺形成过程顺利进行。(iii)该方案适用于成功合成两种农用化学品,溴丁酸酯和杀虫剂。
Nickel (II)-Catalyzed efficient aminocarbonylation of unreactive alkanes with formanilides—Exploiting the deformylation behavior of imides
attracted much attention of organic chemists. In this paper, we developed a Ni(acac)2-catalyzed activation of unreactive alkanes with formanilides in the presence of carbonmonoxide to furnish moderate to excellent yields of amides. This is the first example of aminocarbonylation of inert alkanes using nickel-based catalyst, and formanilides is disclosed to be an interesting amine source owing to the peculiar
Herein, we report an arenethiolate-catalyzed 1,5-HAT of arylhalides to obtain γ-spirolactams through a SET reduction/intramolecular 1,5-HAT/cyclization/HAT process. This protocol features metal-free conditions and a broadsubstratescope, furnishing the γ-spirolactams in moderate to excellent yields. Notably, aryl bromides, aryl chlorides and even aryl fluorides are well tolerated in this transformation
General Approach to Amides through Decarboxylative Radical Cross-Coupling of Carboxylic Acids and Isocyanides
作者:Qing Yan、Qing-Jia Yuan、Andrey Shatskiy、Gregory R. Alvey、Elena V. Stepanova、Jian-Quan Liu、Markus D. Kärkäs、Xiang-Shan Wang
DOI:10.1021/acs.orglett.4c00872
日期:2024.4.26
silver-catalyzed protocol for decarboxylative cross-coupling between carboxylicacids and isocyanides, leading to linear amide products through a free-radical mechanism. The disclosed approach provides a general entry to a variety of decorated amides, accommodating a diverse array of radical precursors, including aryl, heteroaryl, alkynyl, alkenyl, and alkyl carboxylicacids. Notably, the protocol proved to