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Relevant bibliographies by topics / Ketones Pyrazoles

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Journal articles

Academic literature on the topic 'Ketones Pyrazoles'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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Journal articles on the topic "Ketones Pyrazoles"

1

Lellek, Vit, Cheng-yi Chen, Wanggui Yang, Jie Liu, Xuebao Ji, and Roger Faessler. "An Efficient Synthesis of Substituted Pyrazoles from One-Pot Reaction of Ketones, Aldehydes, and Hydrazine Monohydrochloride." Synlett 29, no. 08 (2018): 1071–75. http://dx.doi.org/10.1055/s-0036-1591941.

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An efficient, one-pot and metal-free process for the preparation of 3,5-disubstituted and 3,4,5-trisubstituted pyrazoles on multi-gram scale was developed. One-pot condensation of ketones, aldehydes and hydrazine monohydrochloride readily formed pyrazoline intermediates under mild conditions. Oxidation of pyrazolines, in situ, employing bromine afforded a wide variety of pyrazoles. The methodology offers a fast, and often chromatography-free protocol for the synthesis of 3,4,5-substituted pyrazoles in good to excellent yields. Alternatively, a more benign oxidation protocol affords 3,5-disubst

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2

El-Alali, Abdullah, and Ahmed S. Al-Kamali. "Reactions of 1,3-dipolar aldazines and ketazines with the dipolarophile dimethyl acetylenedicarboxylate." Canadian Journal of Chemistry 80, no. 10 (2002): 1293–301. http://dx.doi.org/10.1139/v02-169.

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The prepared aldazines (aldehyde azines) and ketazines (ketone azines) were allowed to react with 2 mol of the acetylene derivative. The first products formed were pentalene azine derivatives, which in some cases underwent skeletal rearrangment into acyclic tetraene azines. The latter underwent, in the case of some aldazine products, further skeletal rearrangment into N-allyl pyrazoles. The occurence of these rearrangments is dependant on the nature of the aldehydes or ketones used.Key words: dimethyl acetylenedicarboxylate (DMAD), aldazines, ketazines, N-allyl pyrazoles.

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3

Hahn, Marianne, Gottfried Heinisch, Wolfgang Holzer, and Helga Schwarz. "Pyrazoles. 6. Synthesis of novel heteroaryl 4-pyrazolyl ketones." Journal of Heterocyclic Chemistry 28, no. 5 (1991): 1189–92. http://dx.doi.org/10.1002/jhet.5570280505.

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4

Albar, Hassan A. "1,3-Dipolar Cycloaddition of Four Hydrazonoyl Chlorides to β-Diketones and α,β-Unsaturated Ketones". Journal of Chemical Research 23, № 3 (1999): 182–83. http://dx.doi.org/10.1177/174751989902300306.

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The 1,3-dipolar cycloaddition of four hydrazonoyl chloride derivatives with the sodium salt of unsymmetrical β-diketones (benzoylacetone) offers a versatile method for the regioselective synthesis of 2 H-pyrazoles in a similar fashion to the cycloaddition of the nitrilimides with α,β-unsaturated ketones and esters; the structures of the prepared isomeric pyrazole and pyrazoline derivatives are established by spectroscopic and chemical methods.

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5

Thirunarayanan, Ganesamoorthy, and K. Ravi. "Synthesis and Spectral Correlation Study of some 3-(3,4-dichlorophenyl)-5-(Substituted Phenyl)-4,5-dihydro-¹H-Pyrazole-1-yl-Ethanones." International Letters of Chemistry, Physics and Astronomy 19 (October 2013): 44–57. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.19.44.

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Some N-acetyl pyrazoles including 3-(3,4-dichlorophenyl)-5-(substituted phenyl)-4,5-dihydro-1H-pyrazole-1-yl-ethanones have been synthesised by solvent free cyclization cum acetylation of chalcones including substituted styryl 3,4-dichlorophenyl ketones using hydrazine hydrate and acetic anhydride in presence of catalytic amount of fly-ash: H2SO4 catalyst. The yield of these N-acetyl pyrazole derivatives are more than 75%. The synthesised N-acetyl pyrazoline derivatives were characterized by their physical constants and spectral data. The infrared spectral νC=N and C=O (cm-1) frequencies, NMR

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6

Chovatia, P. T., J. D. Akabari, P. K. Kachhadia, P. D. Zalavadia, and H. S. Joshi. "Synthesis and selective antitubercular and antimicrobial inhibitory activity of 1-acetyl-3,5-diphenyl-4,5-dihydro-(1h)-pyrazole derivatives." Journal of the Serbian Chemical Society 71, no. 7 (2006): 713–20. http://dx.doi.org/10.2298/jsc0607713c.

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The new compounds 1-aryl-3-{1-phenyl-3-[p (methylthio)phenyl]pyrazol-4-yl}-2-propen-1-ones 2a?l were prepared by the condensation of 1-phenyl-3-[p (methylthio)phenyl]-4-formylpyrazole 1 with different aryl ketones. Compounds 2a?l in reaction with hydrazine hydrate yielded 3-aryl-5-{1-phenyl-3-[p-(methylthio)phenyl]pyrazol-4 yl}-4,5-dihydro-(1H)-pyrazoles 3a?l and in the presence of hydrazine hydrate in glacial acetic acid gave 1-acetyl-3-aryl 5-{1-phenyl-3-[p-(methylthio)phenyl]pyrazol-4-yl}-4,5 dihydro-(1H)-pyrazoles 4a?l. These compounds were tested in vitro for their antitubercular and anti

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7

Verlee, Arno, Thomas Heugebaert, Tom van der Meer, Pavel Kerchev, Frank Van Breusegem, and Christian V. Stevens. "Domino reaction of a gold catalyzed 5-endo-dig cyclization and a [3,3]-sigmatropic rearrangement towards polysubstituted pyrazoles." Organic & Biomolecular Chemistry 16, no. 48 (2018): 9359–63. http://dx.doi.org/10.1039/c8ob02807a.

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8

HAHN, M., G. HEINISCH, W. HOLZER, and H. SCHWARZ. "ChemInform Abstract: Pyrazoles. Part 6. Synthesis of Novel Heteroaryl 4-Pyrazolyl Ketones." ChemInform 23, no. 4 (2010): no. http://dx.doi.org/10.1002/chin.199204159.

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9

Kim, Jung Keun, Ming Gong, Elvira A. Shokova, et al. "Pyrazoles: ‘one-pot’ synthesis from arenes and carboxylic acids." Organic & Biomolecular Chemistry 18, no. 29 (2020): 5625–38. http://dx.doi.org/10.1039/d0ob01228a.

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A rapid and efficient method for ‘one-pot’ synthesis of pyrazoles from (hetero)arenes and carboxylic acids via successive formation of ketones and β-diketones followed by heterocyclization with hydrazine has been developed.

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10

Maity, Rajendra, and Subhas Chandra Pan. "Enantioselective aminocatalytic synthesis of tetrahydropyrano[2,3-c]pyrazoles via a domino Michael-hemiacetalization reaction with alkylidene pyrazolones." Organic & Biomolecular Chemistry 15, no. 38 (2017): 8032–36. http://dx.doi.org/10.1039/c7ob02170d.

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An enantioselective organocatalytic synthesis of fused tetrahydropyranopyrazole products has been achieved via a domino Michael-hemiacetalization reaction between alkylidene pyrazolones and cyclic ketones/pentanal.

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