Rajput K, Singh V, Singh S, Srivastava V. A chromatography-free one-pot, two-step synthesis of 1,2,4-thiadiazoles from primary amides
via thiolation and oxidative dimerization under solvent-free conditions: a greener approach.
RSC Adv 2024;
14:22480-22485. [PMID:
39015666 PMCID:
PMC11250125 DOI:
10.1039/d4ra03993a]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Accepted: 07/05/2024] [Indexed: 07/18/2024] Open
Abstract
An efficient and practical one-pot, two-step synthesis of 1,2,4-thiadiazoles from primary amides with Lawesson reagent (LR) and tert-butyl hydrogen peroxide (TBHP) without solvent is demonstrated for the first time. This groundbreaking and environmentally friendly approach utilises readily available starting materials and eliminates the use of traditional solvents in the reaction process. The broad substrate scope, excellent functional group tolerance in mild and metal-free conditions, quick conversion, and excellent yields are essential features of this methodology. All the compounds were purified without column chromatography.
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