AN EFFICIENT SYNTHESIS OF 4-DIMETHOXYPHOSPHONYL SUBSTITUTED PYRAZOLES AND PYRAZOLINE-5-ONES

AN EFFICIENT SYNTHESIS OF 4-DIMETHOXYPHOSPHONYL SUBSTITUTED PYRAZOLES AND PYRAZOLINE-5-ONES

2-Dimethoxyphosphonyl-1,3-dicarbonyl compounds (1a-c) were used for the synthesis of 4-dimethoxyphosphonyl substituted pyrazoles (2a-e) and pyrazoline-5-ones (5a-c). Intermediate hydrazones (3b, c) were also isolated. 5a exists in the OH tautomeric form, whereas 5c-in the NH form. Tautomeric transit...

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Veröffentlicht in:Phosphorus, sulfur, and silicon and the related elements sulfur, and silicon and the related elements, 1993-10, Vol.83 (1-4), p.53-58
Hauptverfasser: Khotinen, Alexander V., Polozov, Alexander M.
Format: Artikel
Sprache:eng
Schlagworte:
C-NMR-spectra
hydrazine
pyrazole
pyrazoline-5-one
tautomer
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Zusammenfassung:2-Dimethoxyphosphonyl-1,3-dicarbonyl compounds (1a-c) were used for the synthesis of 4-dimethoxyphosphonyl substituted pyrazoles (2a-e) and pyrazoline-5-ones (5a-c). Intermediate hydrazones (3b, c) were also isolated. 5a exists in the OH tautomeric form, whereas 5c-in the NH form. Tautomeric transition from the OH into the NH form was found for 5b at the melting point.
ISSN:1042-6507
1563-5325
DOI:10.1080/10426509308034347