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DOI: 10.1055/s-0030-1258371
Synthesis of 6-Amino-2-bromo-4-hydroxynicotinaldehyde Derivatives
Publication History
Publication Date:
20 December 2010 (online)
Abstract
Acylation of (1,3-dimethylbenzimidazol-2-ylidene)-, (3-methylbenzothiazol-2-ylidene)-, and (3,4-dimethylthiazol-2-ylidene)-acetonitriles with 1-(cyanoacetyl)-3,5-dimethylpyrazole was found to proceed at the exocyclic carbon atom, yielding the appropriate 2-heterylidene-3-oxopentanedinitriles. Treatment of the prepared dinitriles with hydrobromic acid in refluxing acetic acid afforded 2-(6-amino-2-bromo-4-hydroxypyridin-3-yl)-substituted quaternary salts of benzimidazolium, benzothiazolium, and thiazolium. Their structures were confirmed unambiguously by X-ray crystallographic studies. Reduction of these quaternary salts with excess sodium borohydride yielded the corresponding dihydro (in the case of benzoazoles) or tetrahydro (in the case of thiazole) derivatives, which were shown to be synthetic equivalents of the title nicotinaldehyde.
Key words
aldehydes - heterocycles - hydrazones - nitriles - pyridines
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