Palladium-Catalyzed Thiocarbonylation of Aryl, Vinyl, and Benzyl Bromides
作者:Mia N. Burhardt、Andreas Ahlburg、Troels Skrydstrup
DOI:10.1021/jo5009965
日期:2014.12.19
A catalytic protocol for synthesis of thioesters from aryl, vinyl, and benzyl bromides as well as benzyl chlorides was developed using only stoichiometric amounts of carbon monoxide, produced from a solid CO precursor inside a two-chamber system. As a catalytic system, the combination of bis(benzonitrile) palladium(II) chloride and Xantphos furnished the highest yields of the desired compounds, along
Rh(I)-Catalyzed Intramolecular Decarbonylation of Thioesters
作者:Han Cao、Xuejing Liu、Fusheng Bie、Yijun Shi、Ying Han、Peng Yan、Michal Szostak、Chengwei Liu
DOI:10.1021/acs.joc.1c01117
日期:2021.8.6
valuable thioethers. Notable features include the absence of phosphine ligands, inorganic bases, and other additives and excellent group tolerance to aryl chlorides and bromides that are problematic using other metals to promote decarbonylation. Gram scale synthesis, late-stage pharmaceutical derivatization, and orthogonal site-selective cross-couplings by C–S/C–Br cleavage are reported.
coupling of readily available aroylhydrazides with disulfides is developed, in which oxidative expulsion of N2 overcomes the activation barrier between the carboxylic acidderivatives and the products. The reaction produces various thioesters in good to excellent yields with good functional group tolerance. In the reaction, stable and easily available aroylhydrazides are used as acyl sources and the
通过易得的芳酰肼与二硫化物的铜催化的氧化偶联,开发了另一种硫酯化反应,其中N 2的氧化排出克服了羧酸衍生物和产物之间的活化障碍。该反应以良好的收率和优异的官能度耐受性产生了各种硫酯。在该反应中,将稳定且容易获得的芳酰基酰肼用作酰基源,并将相对无味的二硫化物用作S源。机理研究表明,铜盐与氧化剂(NH 4)2 S 2 O 8的反应 可以实现串联过程,包括去质子化,自由基介导的脱氮和CS键形成。
Catalyst-free direct decarboxylative coupling of α-keto acids with thiols: a facile access to thioesters
作者:Kelu Yan、Daoshan Yang、Wei Wei、Jing Zhao、Yuanyuan Shuai、Laijin Tian、Hua Wang
DOI:10.1039/c5ob00769k
日期:——
A novel, efficient, and catalyst-free strategy has been initially developed for the construction of thioesters via the direct radical oxidative decarboxylation of α-ketoacids with thiols, and the corresponding target products were obtained in moderate to good yields. It offers an alternative approach for the synthesis of useful diverse thioesters.
Copper-catalyzed decarboxylative coupling between α-oxocarboxylic acids and diphenyl disulfides or thiophenols is presented, which provided an effective and direct approach for the preparation of useful thioesters through C(sp2)–S bond formation.