for transamidation of thioamides by N−C(S) transacylation is reported. This process exploits the concept of site-selective N-tert-butoxycarbonyl activation, resulting in ground-state-destabilization of thioamides. The study establishes a powerful direction to the development of new molecules in chemistry and biology by rational modification of nN→π*C=S resonance of the thioamide bond.
报道了第一种通过 NC(S) 转酰基作用对硫代酰胺进行转酰胺基作用的通用、温和且高度化学选择性的方法。该过程利用了位点选择性 N-叔丁氧羰基活化的概念,导致硫代酰胺的基态不稳定。该研究通过对硫代酰胺键的n N →π* C=S共振进行合理修饰,为化学和生物学新分子的发展奠定了有力的方向。
Microwave-assisted synthesis of thioamides with elemental sulfur
sodium hydrogen sulfide/diethylamine hydrochloride (8) as the reagent. Thioamides have also been prepared from amides, reacting them with tetraphosphorus decasulfide, either with or without additives (9), or using Lawesson’s reagent (10), ethylaluminum sulfide (11), or boron sulfide (12). Another method for the synthesis of thioamides utilizes elemental sulfur in the Willgerodt–Kindler reaction involving
Europhtal: An industrial cobalt phthalocyanine complex as the efficient catalyst for synthesis of thioamides by one‐pot reaction of mercaptans and amines
The potential of industrial cobaltphthalocyanines in the synthesis of thioamides is reported. A mixture of an industrial sulfonated cobaltphthalocyanines known as Co[(SO3Na)2,3Pc] (Europhtal catalyst additive 8020) is introduced as an efficient catalyst capable of converting benzyl thiols to synthetically valuable thioamides by reaction with amines and DMSO. In this procedure, different primary and
Environmentally friendly ynamide-mediated thioamidation of monothiocarboxylic acids with amines or ammonium hydroxide for the syntheses of thioamides and primary thioamides is described. Simple and mild reaction conditions enable the reaction to tolerate a wide variety of functional groups such as hydroxyl group, ester, tertiary amine, ketone, and amide moieties. Readily available NaSH served as the
描述了用于合成硫代酰胺和伯硫代酰胺的环保型 ynamide 介导的单硫代羧酸与胺或氢氧化铵的硫代酰胺化反应。简单温和的反应条件使反应能够耐受多种官能团,例如羟基、酯、叔胺、酮和酰胺部分。现成的 NaSH 作为硫源,避免使用有毒、昂贵和恶臭的有机硫试剂,使该策略对环境友好且实用。重要的是,α-手性单硫代羧酸的立体化学完整性在活化步骤和随后的氨解过程中得以保持,从而为肽 C 末端修饰提供了一种无外消旋化策略。此外,
Effect of Amine Nature on Reaction Mechanism: Aminolyses of <i>O</i>-4-Nitrophenyl Thionobenzoate with Primary and Secondary Amines
作者:Ik-Hwan Um、Seung-Eun Lee、Hey-Jin Kwon
DOI:10.1021/jo0259360
日期:2002.12.1
determined for the reactions of 2 with all the primary and secondaryamines studied. The k(1) value is larger for the reaction with the primaryamine than for the reaction with the isobasic acyclic secondaryamines, while the k(-)(1) value is much larger for the latter reaction than for the former reaction. The k(3) value for the reaction with secondaryamine is independent of the amine basicity. The small