The Mechanism of the Thermolytic Ring Opening of 5-Azido-4-formyl-3-methyl-1-phenylpyrazole.
Jan Becher,Mikael Begtrup,Anne Gjerløv,Sine Larsen,Wim Dehaen,Lene Krogh Christensen,Anna Napoli,Giovanni Sindona,Dagfinn W. Aksnes,George W. Francis,Atle Aaberg +10 more
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This article is published in Acta Chemica Scandinavica.The article was published on 1995-01-01 and is currently open access. It has received 5 citations till now.read more
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Reactions in the conjugated ‘ene–ene–yne’ manifold: five-membered ring fragmentation and ring formation via coarctate/pseudocoarctate mechanisms
TL;DR: This review highlights both the synthetic and mechanistic aspects of these unique reactions, which involve the generation of either a carbene or nitrene intermediate, and provide access to hard to obtain heterocyclic or ene-ene-yne structures.
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Tautomerism of 1-(2′,4′-dinitrophenyl)-3-methyl-2-pyrazolin-5-one: theoretical calculations, solid and solution NMR studies and X-ray crystallography
Christophe Dardonville,José Elguero,Isabel Rozas,Cristina Fernández-Castaño,Concepción Foces-Foces,Isabel Sobrados +5 more
TL;DR: In this article, different studies were performed to gain a better understanding of the tautomerism of 1-(2′,4′-dinitrophenyl)-3-methyl-2-pyrazolin-5-one, 2.
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A Pyrazole to Furan Rearrangement. Thermolysis of 5-Azido-4-formylpyrazoles.
TL;DR: It is demonstrated how one can bias the two pathways using external reagents, thereby changing the product distribution ratio 2:3 from 1:1 in the unbiased case, to 1:4 in one direction, and to better than 20: 1 in the other direction.
Journal ArticleDOI
One‐Pot and Convenient Conversion of 5‐Azidopyrazole‐4‐carboxaldehyde to Pyrazolo[3,4‐b]pyridines
TL;DR: In this article, a one-pot and convenient synthesis of multisubstituted pyrazolo[3,4]pyridines in moderate to high yields has been achieved by a two-step reaction: diazo-transfer of 5.azido•1.phenylpyrazole•4.carboxaldehydes to ketones in ethanolic KOH to give 5.amino•1−phenyl pyrazole−4‐carboxaldehyde and subsequent Friedlaender reaction of 5.'amino‐1‐phenylp