- Eclectic 1-Aryl-1,2-diazabuta-1,3-dienes: Valuable tools for the preparation of pyrrol-2-ones, 1-arylpyrazoles, 2-(3-oxopyrazol-4-yl)malonates and 4-(2-oxopyrrol-3-yl)pyrazol-3-ones
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1-Aryl-1,2-diazabuta-1,3-dienes react with dimethyl malonate to give hydrazonic intermediates that in turn are converted into pyrrol-2-ones, 1-arylpyrazoles and 2-(3-oxopyrazol-4-yl)malonates. The latter compounds represent an useful entry to 4-(2-oxopyrrol-3-yl)pyrazol-3-ones, by means of the addition of another molecule of 1,2-diazabuta-1,3-diene and subsequent cyclization of the adducts.
- Attanasi, Orazio A.,De Crescentini, Lucia,Favi, Gianfranco,Filippone, Paolino,Mantellini, Fabio,Santeusanio, Stefania
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p. 1546 - 1552
(2007/10/03)
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- Reactive intermediates in the photochemistry of 4-diazo-2-pyrazolin-5-ones
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Photolysis of 4-diazo-2-pyrazolin-5-ones in methanol gives a mixture of stereoisomeric methyl 3-aryl-(or alkyl-)azo-2-alkenoates.A study of the absorption spectra of the species generated upon steady-state photolyses in glasses at 77 K, in solution at 296
- Umrigar, Pesi,Griffin, Gary W.,Ege, Seyhan N.,Adams, Alan D.,Das, Paritosh K.
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p. 2456 - 2463
(2007/10/02)
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