Ganai AM, Pathan TK, Sayyad N, Kushwaha B, Kushwaha ND, Tzakos AG, Karpoormath R. DBU mediated one-pot synthesis of triazolo triazines
via Dimroth type rearrangement.
RSC Adv 2022;
12:2102-2106. [PMID:
35425261 PMCID:
PMC8979044 DOI:
10.1039/d1ra07749j]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 12/11/2021] [Indexed: 11/21/2022] Open
Abstract
Herein we report an efficient one-pot synthesis of [1,2,4]triazolo[1,5 a][1,3,5]triazines from commercially available substituted aryl/heteroaryl aldehydes and substituted 2-hydrazinyl-1,3,5-triazines via N-bromosuccinimide (NBS) mediated oxidative C–N bond formation. Isomerisation of [1,2,4]triazolo[4,3-a][1,3,5]triazines to [1,2,4]triazolo[1,5-a][1,3,5]triazines is driven by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) affording both isomers with good to excellent yields (70–96%).
We demonstrate a simple yet efficient one-pot synthesis of two triazolotriazine isomers via DBU mediated Dimroth type rearrangement with excellent yields.![]()
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