Water Mediated Direct Thioamidation of Aldehydes at Room Temperature
作者:Ankush Gupta、Jigarkumar K. Vankar、Jaydeepbhai P. Jadav、Guddeangadi N. Gururaja
DOI:10.1021/acs.joc.1c02307
日期:2022.3.4
A mild, greener approach toward thioamide synthesis has been developed. Its unique features include water-mediated reaction with no input energy, additives, or catalysts as well. The presented protocol is attractive with readily available starting materials and the use of different array amines, along with a scaled-up method. Biologically active molecules such as thionicotinamide and thioisonicotinamide
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.
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
Vinyl-λ<sup>3</sup>-iodanes act as efficient sulfur atom acceptors: vinylic S<sub>N</sub>2-based strategy for conversion of tertiary thioamides to amides
作者:Masahito Ochiai、Shinji Yamamoto
DOI:10.1039/b209097j
日期:——
Exposure of tertiary thioamides to (E)-1-hexenyl(phenyl)-λ3-iodane results in vinylic SN2 reaction to give the inverted (Z)-S-vinylthioimidonium salts, which under alkaline hydrolysis (Na2CO3 or K2CO3) selectively afford amides, while (Z)-S-vinyl thioesters are obtained in high yields via the hydrolysis under acidic conditions (HCl).