AbstractNovel copper‐catalyzed three‐component reactions of phenylacetonitrile, sulfur and DMF (dimethyformamide) for the selective preparation of N,N‐dimethylthiobenzamide and N,N‐dimethyl‐2‐phenylethanethioamides in yields of up to 96% are described.magnified image
Transition-Metal-Free Cleavage of C–C Triple Bonds in Aromatic Alkynes with S<sub>8</sub> and Amides Leading to Aryl Thioamides
作者:Kai Xu、Ziyi Li、Fangyuan Cheng、Zhenzhen Zuo、Tao Wang、Mincan Wang、Lantao Liu
DOI:10.1021/acs.orglett.8b00573
日期:2018.4.20
transition-metal-free cleavage reaction of C–C triplebonds in aromatic alkynes with S8 and amides furnishes aryl thioamides in moderate to excellent yields. The remarkable features of this thioamidation include the metal-free cleavage of C–C triple bond, mild reaction conditions, as well as wide substrate scope that is particularly compatible with some internal aromatic alkynes and acetamides.
An efficient decarboxylative thioamidation of arylacetic and cinnamic acids has been developed employing formamides as amine surrogate and sulfur as promoter. Thioamides with variant structural features are obtained under mild reaction conditions without the use of transition metal catalysts and oxidants.
A general method for one-potsynthesis of thioamides without transition metals or external oxidants is developed through a three-component reaction involving chlorohydrocarbon, amide and elementalsulfur. Both alkyl and aryl thioamides could be obtained in moderate to excellent yields through this protocol. A high tolerance regarding various substituents on chlorohydrocarbon or amide was justified
General Construction of Thioamides under Mild Conditions: A Stepwise Proton Transfer Process Mediated by EDTA
作者:Hao Jin、Xin Ge、Shaodong Zhou
DOI:10.1002/ejoc.202101013
日期:2021.11.25
of experiments and quantum chemical calculations. Ester, amide, and elemental sulfur are employed as the starting materials and ethylene diamine tetraacetic acid (EDTA) serves as the catalyst to facilitate the benign reaction. The catalytic role of EDTA is attributed to a stepwise proton transfer process in which EDTA transports a proton from the benzyl carbon to a sulfur atom.