Aerobic Visible‐Light Induced Intermolecular S−N Bond Construction: Synthesis of 1,2,4‐Thiadiazoles from Thioamides under Photosensitizer‐Free Conditions
作者:Liang Zhuo、Shihua Xie、Hui Wang、Hongjun Zhu
DOI:10.1002/ejoc.202100440
日期:2021.6.21
A green approach for S−Nconstruction with concomitant synthesis of1,2,4-thiadiazoles was developed by visible-light induced oxidative cyclization of thioamidesunder photosensitizer-free conditions.
Synthesis of 1,2,4-Thiadiazoles by Oxidative Dimerization of Carbothioamides by Using Oxone
作者:Akira Yoshimura、Anthony D. Todora、Brent J. Kastern、Steven R. Koski、Viktor V. Zhdankin
DOI:10.1002/ejoc.201402756
日期:2014.8
1,2,4-Thiadiazoles were efficiently synthesized in good yields through the oxidative dimerization of carbothioamides by using Oxone as a readily available, inexpensive, and environmentally safe oxidant. A similar reaction of phenylselenoamide led to the corresponding 1,2,4-phenylselenadiazole in high yield.
3,5-Disubstituted 1,2,4-thiadiazoles 2 were prepared by reaction of thioamides 1 with DMSO in the presence of such an electrophilic reagent as 1-methyl-2-chloropyridinium iodide, benzoyl chloride, acetyl chloride, hydrochloric acid, or trimethylsilyl chloride in organic solvents at room temperature in high yields. Thiadiazoles 2 were also obtained by reaction of 1 with NBS at room temperature in high
A Simple and Convenient Method for the Synthesis of 3,5-disubstituted 1,2,4-thiadiazoles via Oxidative Dimerization of Primary Thioamides
作者:D. Subhas Bose、K. Raghavender Reddy
DOI:10.1002/jhet.2627
日期:2017.1
A simple and efficient protocol has been developed for the preparation of 3,5‐diaryl‐1,2,4‐thiadiazoles in high yields through the oxidative dimerization of primary thioamides in aqueous medium at room temperature.
High yielding protocol for oxidative dimerization of primary thioamides: a strategy toward 3,5-disubstituted 1,2,4-thiadiazoles
作者:G. Vanajatha、V. Prabhakar Reddy
DOI:10.1016/j.tetlet.2016.04.029
日期:2016.6
Ceric ammonium nitrate (CAN), a highly versatile reagent, was found to efficiently mediate the oxidative dimerization of primary thioamides in acetonitrile at room temperature leading to the rapid and expeditious synthesis of symmetrically 3,5-disubstituted 1,2,4-thiadiazoles in high yields. (C) 2016 Elsevier Ltd. All rights reserved.