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DOI: 10.1055/s-0029-1216996
A Straightforward Synthesis of 2-(1-Vinyl-1H-pyrrol-2-yl)-1H-benzimidazoles from 1-Vinyl-1H-pyrrole-2-carbaldehydes and o-Phenylenediamine
Publication History
Publication Date:
08 September 2009 (online)

Abstract
Hitherto inaccessible 1-vinylpyrrole-benzimidazole ensembles have been synthesized by the condensation of 1-vinyl-1H-pyrrole-2-carbaldehydes with o-phenylenediamine either directly or via the intermediate Schiff bases of the 1-vinyl-1H-pyrrole-2-carbaldehydes (1% TFA, DMSO, air atmosphere, 60-70 ˚C, 1 h) in yields up to 89%, the intermediate Schiff bases of exclusively E configuration being isolated in 91-98% yield (1% TFA, DMSO, r.t., 30 min). The synthesized 2-(1-vinyl-1H-pyrrol-2-yl)-1H-benzimidazoles are intensely fluorescent, covering the practically important blue region (λmax 343-417 nm, Stokes shift 31-91 nm).
Key words
1-vinyl-1H-pyrrole-2-carbaldehydes - pyrrolylbenzimidazoles - o-phenylenediamine - Schiff bases - oxidative condensation
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