A novel ynamide-mediated thioester synthesis strategy was developed. Importantly, no detectable racemization was observed for the thioesterifications of carboxylic acids containing an α-chiral center, enabling it to be useful for the synthesis of peptide thioester, which is the key component of native chemical ligation. It is worth mentioning that amino acid side chain functional groups such as -OH
Organocatalytic Transformation of Aldehydes to Thioesters with Visible Light
作者:Yueteng Zhang、Peng Ji、Wenbo Hu、Yongyi Wei、He Huang、Wei Wang
DOI:10.1002/chem.201900932
日期:2019.6.21
A metal‐ and oxidant‐free catalytic method for accessing structurally diverse thioesters from readily accessible, widespread aldehydes, is described. A strategy of a simple organic 9,10‐phenanthrenequinone‐promoted hydrogen atom transfer (HAT) with visible light was successfully implemented to selectively generate acyl radicals without inducing crossover reactivity of thioester products. The preparative
Diverse thiolesters were synthesized in good to excellent yields (76-99%) by reactions of thiophenol, benzyl mercaptan, ethyl mercaptoacetate, and mercaptoacetic acid with N-acylbenzotriazoles under mild conditions. These results demonstrate the utility of N-acylbenzotriazoles as mild S-acylating agents, especially when the corresponding acid chlorides are not readily available.
NHC-catalyzed thioesterification of aldehydes by external redox activation
作者:Takuya Uno、Tsubasa Inokuma、Yoshiji Takemoto
DOI:10.1039/c2cc17183j
日期:——
The NHC-catalyzed thioesterification of aromatic or aliphatic aldehydes with a range of thiols was developed in the presence of a stoichiometric amount of an organic oxidant. Among the oxidants examined, phenazine was shown to give the best results in terms of chemical yield and compatibility with thiols.
N-Heterocyclic Carbene Catalysed Oxidative Coupling of Aldehydes with Alcohols/Thiols and One-Pot Oxidation/Esterification of Allylic Alcohols
作者:Miran Ji、Xi Wang、Yu Na Lim、Ye-Won Kang、Hye-Young Jang
DOI:10.1002/ejoc.201301337
日期:2013.12
carbene-catalysed oxidation protocol involving N-heterocyclic carbene catalysts and 2,2,6,6-tetramethylpiperidine N-oxyl (TEMPO) is described for the synthesis of esters, cinnamic acids, and thioesters. A wide range of esters, thioesters, and cinnamic acids were obtained by metal-free coupling of aldehydes with aliphatic, allylic and aromatic alcohols, benzyl mercaptan, and water. In addition to the oxidative coupling
描述了一种涉及 N-杂环卡宾催化剂和 2,2,6,6-四甲基哌啶 N-氧基 (TEMPO) 的多功能卡宾催化氧化方案,用于合成酯、肉桂酸和硫酯。通过醛与脂肪醇、烯丙醇和芳香醇、苄基硫醇和水的无金属偶联,可以获得多种酯、硫酯和肉桂酸。除了醛与亲核试剂的氧化偶联外,在我们的氧化偶联条件下还发现了饱和醛的脱氢和烯丙醇的氧化。与其他 TEMPO 介导的氧化酯化反应不同,该反应不会通过 TEMPO 酯中间体进行以形成酯和硫酯。