Cascade Trisulfur Radical Anion (S<sub>3</sub><sup>•–</sup>) Addition/Electron Detosylation Process for the Synthesis of 1,2,3-Thiadiazoles and Isothiazoles
作者:Bei-Bei Liu、Hui-Wen Bai、Huan Liu、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.joc.8b01450
日期:2018.9.7
Trisulfur radical anion (S3•–) mediated reactions with in situ formed azoalkenes and α,β-usaturated N-sulfonylimines for the construction of 1,2,3-thiadiazoles and isothiazoles has been developed. S3•– is in situ generated from potassium sulfide in DMF. These two approaches provide a new, safe, and simple way to construct 4-subsituted 1,2,3-thiadiazoles, 5-subsituted 1,2,3-thiadiazoles, and isothiazole
New Methods and Reagents in Organic Synthesis. 59. Lithium Trimethylsilydiazomethane: A New Synthon for the Preparation of 5-Substituted 1,2,3-Thiadiazoles