Issue 39, 2017

One-pot synthesis of 3,5-disubstituted 1,2,4-thiadiazoles from nitriles and thioamides via I2-mediated oxidative formation of an N–S bond

Abstract

A simple and practical method for I2-mediated one-pot synthesis of 3-alkyl-5-aryl-1,2,4-thiadiazoles has been developed; the one-pot reaction includes sequential intermolecular addition of thioamides to nitriles, and intramolecular oxidative coupling of N–H and S–H bonds mediated by molecular iodine. Meanwhile the protocol uses readily available nitriles and thioamides as the starting materials, molecular iodine as the oxidant, and generates various 1,2,4-thiadiazoles in moderate to good yields with a wide array of functional groups. This method is an efficient approach for the synthesis of unsymmetrically disubstituted 1,2,4-thiadiazoles.

Graphical abstract: One-pot synthesis of 3,5-disubstituted 1,2,4-thiadiazoles from nitriles and thioamides via I2-mediated oxidative formation of an N–S bond

Supplementary files

Article information

Article type
Paper
Submitted
29 Jul 2017
Accepted
19 Sep 2017
First published
19 Sep 2017

Org. Biomol. Chem., 2017,15, 8410-8417

One-pot synthesis of 3,5-disubstituted 1,2,4-thiadiazoles from nitriles and thioamides via I2-mediated oxidative formation of an N–S bond

L. Chai, Y. Xu, T. Ding, X. Fang, W. Zhang, Y. Wang, M. Lu, H. Xu and X. Yang, Org. Biomol. Chem., 2017, 15, 8410 DOI: 10.1039/C7OB01887H

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