Cu-mediated one-pot three-component synthesis of 3-N-substituted 1,4,2-benzodithiazine 1,1-dioxide derivatives
作者:Wei Dong、Zemei Ge、Xin Wang、Ridong Li、Runtao Li
DOI:10.1016/j.tet.2020.131354
日期:2020.7
A novel and efficient copper-catalyzed one-pot procedure for the synthesis of 3-N-substituted 1,4,2-benzodithiazine 1,1-dioxide derivatives from 2-halobenzenesulfonamides, amines and CS2 is described. The reaction proceeds through Ullmann-type S-arylation, intramolecular addition of NH2 with CS and dehydrosulfide, which provides a new and useful strategy for construction of cyclic aromatic sulfonamides
A MILD AND EFFICIENT TRIPHOSGENE-MEDIATED CYCLODEHYDRATION OF 2-(IMIDOYLTHIO)CARBOXAMIDES. SYNTHESIS AND CHEMISTRY OF 4-AMINO-2-(METHYLTHIO)THIAZOLIUM CHLORIDES
Abstract 4-Aminothiazolium salts 1 are conveniently prepared in a one-step procedure from 2-(imi-doylthio)carboxamides 4 and triphosgene in the presence of pyridine. Their chemical reactions are discussed, including addition to dimethyl acetylenedicarboxylate and carbon disulfide in a basic heterogeneous medium.
A new and easy synthesis of 4‐aryl‐2‐imino‐1,3‐dithiolanes was performed in water/dichloromethane starting from simple precursors, i. e., dithiocarbamate and sulfonium bromide salts. Various possible mechanism pathways were investigated by DFT calculations.
Transformation of Amides to Thioamides Using an Efficient and Novel Thiating Reagent
作者:Mohamed S. Gomaa、Gaber El Enany、Walid Fathalla、Ibrahim A. I. Ali、Samir. M. El Rayes
DOI:10.3390/molecules27238275
日期:——
convenient protocol was developed for the transformation of N-aryl-substituted benzamides to N-aryl-substituted benzothioamides using N-isopropyldithiocarbamate isopropyl ammonium salt as a novel thiating reagent. The major advantages of this protocol are its one-pot procedure, short reaction times, mild conditions, simple work-up, high yields and pure products.
Conformational analysis of N-(1-phenylethyl)-.DELTA.4-thiazoline-2-thiones and analogs. A proton NMR, circular dichroism, x-ray crystallographic, and molecular mechanics study