Oxidative Coupling–Thionation of Amines Mediated by Iron-Based Imidazolium Salts for the Preparation of Thioamides
作者:Isidro Pastor、Patricia Gisbert
DOI:10.1055/s-0037-1610179
日期:2018.8
variety of primary benzylamines and alkylamines, as coupling partners. Thus, various electron-rich and electron-poor substituents in the aromatic rings and also fused piperidine derivatives, are suitable starting materials in this reaction. Some of the obtained products are important synthetic intermediates for natural products. An efficient and selective multicomponent oxidative coupling, involving
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,
Fast Construction of 1,3-Benzothiazepines by Direct Intramolecular Dehydrogenative C–S Bond Formation of Thioamides under Metal-Free Conditions
作者:Wei-Si Guo、Hao Gong、Yan-An Zhang、Li-Rong Wen、Ming Li
DOI:10.1021/acs.orglett.8b02697
日期:2018.10.19
The first general protocol for the synthesis of 1,3-benzothiazepine derivatives was established. With the aid of bench-stable hypervalent iodine promoter fluoro-HTIB, these seven-membered heterocycles can be rapidly synthesized from readily available thioamides under air atmosphere and metal-freeconditions. The transformation can be completed within 1 min at room temperature and features a broad substrate