27069-17-6Relevant articles and documents
Heck Reactions of Acrolein or Enones and Aryl Bromides – Synthesis of 3-Aryl Propenals or Propenones and Consecutive Application in Multicomponent Pyrazole Syntheses
Stephan, Marvin,Panther, Jesco,Wilbert, Fabio,Ozog, Pauline,Müller, Thomas J. J.
, p. 2086 - 2092 (2020/03/23)
3-(Hetero)aryl propenals or propenones are efficiently prepared by a Heck reaction of (hetero)aryl bromides and acrolein or vinyl ketones using Beller's CataCXium Ptb ligand under Jeffery's and Fu's conditions. The formation of these three-carbon building blocks is embedded into consecutive three- and pseudo-four-component syntheses of 3-(hetero)aryl and 3,5-diarylpyrazoles with a broad substitution pattern in moderate to excellent yield.
Sequential Cleavage of Lignin Systems by Nitrogen Monoxide and Hydrazine
Altmann, Lisa-Marie,Heinrich, Markus R.,Hofmann, Dagmar,Hofmann, Laura Elena,Prusko, Lea
supporting information, (2020/03/27)
The cleavage of representative lignin systems has been achieved in a metal-free two-step sequence first employing nitrogen monoxide for oxidation followed by hydrazine for reductive C?O bond scission. In combining nitrogen monoxide and lignin, the newly developed valorization strategy shows the particular feature of starting from two waste materials, and it further exploits the attractive conditions of a Wolff-Kishner reduction for C?O bond cleavage for the first time. (Figure presented.).
Preparation method of pyrazole derivative (by machine translation)
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Paragraph 0081-0085, (2019/12/02)
The preparation method comprises the following steps: mixing an alkyne propyl alcohol derivative, a halogen source, an acid and a solvent, heating and reacting, and reacting to Meyer - Schuster generate the pyrazole derivative. Compared with the prior art, the preparation method disclosed by the invention has 91% the advantages of maximum yield, simple operation, mild conditions, high conversion rate, few byproducts and the like, and provides a brand-new synthetic method for construction of pyrazole compounds. (by machine translation)
Enaminone-Derived Pyrazoles with Antimicrobial Activity
Bhat, Mashooq Ahmad,Al-Omar, Mohamed A.,Naglah, Ahmed M.,Khan, Abdul Arif,Bonomo, Maria Grazia
, (2019/11/25)
A series of pyrazoles derived from the substituted enaminones were synthesized and were evaluated for antimicrobial activity. All the compounds were characterized by the spectral data and elemental analysis. The synthesized compounds were initially screen
Design, synthesis and biological evaluation of novel vicinal diaryl-substituted 1H-Pyrazole analogues of combretastatin A-4 as highly potent tubulin polymerization inhibitors
Bortolozzi, Roberta,Brancale, Andrea,Camacho, Maria Encarnacion,Ferla, Salvatore,Grillo, Elisabetta,Hamel, Ernest,Mariotto, E.,Oliva, P.,Padroni, Chiara,Romagnoli, R.,Ronca, Roberto,Rruga, Fatlum,Salvador, Maria Kimatrai,Viola, Giampietro
, (2019/08/12)
A series of 3-(3′,4′,5′-trimethoxyphenyl)-4-substituted 1H-pyrazole and their related 3-aryl-4-(3′,4′,5′-trimethoxyphenyl)-1-H-pyrazole regioisomeric derivatives, prepared as cis-rigidified combretastatin A-4 (CA-4) analogues, were synthesized and evaluated for their in vitro antiproliferative against six different cancer cell lines and, for selected highly active compounds, inhibitory effects on tubulin polymerization, cell cycle effects and in vivo potency. We retained the 3′,4′,5′-trimethoxyphenyl moiety as ring A throughout the present investigation, and a structure-activity relationship (SAR) information was obtained by adding electron-withdrawing (OCF3, CF3) or electron-releasing (alkyl and alkoxy) groups on the second aryl ring, corresponding to the B-ring of CA-4, either at the 3- or 4-position of the pyrazole nucleus. In addition, the B-ring was replaced with a benzo[b]thien-2-yl moiety. For many of the compounds, their activity was greater than, or comparable with, that of CA-4. Maximal activity was observed with the two regioisomeric derivatives characterized by the presence of a 4-ethoxyphenyl and a 3′,4′,5′-trimethoxyphenyl group at the C-3 and C-4 positions, and vice versa, of the 1H-pyrazole ring. The data showed that the 3′,4′,5′-trimethoxyphenyl moiety can be moved from the 3- to the 4-position of the 1H-pyrazole ring without significantly affecting antiproliferative activity. The most active derivatives bound to the colchicine site of tubulin and inhibited tubulin polymerization at submicromolar concentrations. In vivo experiments, on an orthotopic murine mammary tumor, revealed that 4c inhibited tumor growth even at low concentrations (5 mg/kg) compared to CA-4P (30 mg/kg).
Calcium carbide as the acetylide source: Transition-metal-free synthesis of substituted pyrazoles via [1,5]-sigmatropic rearrangements
Yu, Yue,Huang, Wei,Chen, Yang,Gao, Bingjie,Wu, Wanqing,Jiang, Huanfeng
supporting information, p. 6445 - 6449 (2018/06/08)
Under transition-metal-free conditions, calcium carbide was used as the acetylide source to react with a wide range of N-tosylhydrazones derived from aldehydes or ketones, affording various substituted pyrazoles in good yields with high regioselectivities. The transformations go through [3 + 2] cycloadditions followed by [1,5]-sigmatropic rearrangements, which are supported by deuterium-labeling experiments.
Chemoselective Reduction of α-Cyano Carbonyl Compounds: Application to the Preparation of Heterocycles
Pollack, Scott R.,Kuethe, Jeffrey T.
supporting information, p. 6388 - 6391 (2016/12/23)
β-Aminoacrylates are reactive intermediates that are useful building blocks in synthesis. General methods for their preparation typically afford α and β disubstitution patterns or β only. Molecules with only α-substituents (β-hydrogen) are much less well-known. A chemoselective reductive tautomerization of α-cyanoacetates, using DIBAL-H, has been developed to access these valuable synthons. α,β-Unsaturated cyanoacetates and α-cyanoketones can, also, be selectively reduced via this methodology. A series of heterocycles were prepared using these β-enamino carbonyl compounds.
Identification of anticancer agents based on the thieno[2,3-b]pyridine and 1H-pyrazole molecular scaffolds
Eurtivong, Chatchakorn,Reynisdóttir, Inga,Kuczma, Stephanie,Furkert, Daniel P.,Brimble, Margaret A.,Reynisson, Jóhannes
supporting information, p. 3521 - 3526 (2016/07/20)
Structural similarity search of commercially available analogues of thieno[2,3-b]pyridine and 1H-pyrazole derivatives, known anticancer agents, resulted in 717 hits. These were docked into the phosphoinositide specific-phospholipase C (PLC) binding pocket, the putative target of the compounds, to further focus the selection. Thirteen derivatives of the thieno[2,3-b]pyridines were identified and tested against the NCI60 panel of human tumour cell lines. The most active derivative 1 was most potent against the MDA-MB-435 melanoma cell line with GI50at 30?nM. Also, it was found that a piperidine moiety is tolerated on the thieno[2,3-b]pyridine scaffold with GI50?=?296?nM (MDA-MB-435) for derivative 10 considerably expanding the structure activity relationship for the series. For the 1H-pyrazoles four derivatives were identified using the in silico approach and additionally ten were synthesised with various substituents on the phenyl moiety to extend the structural activity relationship but only modest anticancer activity was found.
Selective palladium-catalyzed direct C-H arylation of unsubstituted N-protected pyrazoles
Kumpulainen, Esa T. T.,Pohjakallio, Antti
supporting information, p. 1555 - 1561 (2014/06/09)
A highly selective C-5 arylation of N-dimethylaminosulfamoyl-protected pyrazole with aryl bromides is catalyzed by 2-5 mol% palladium in the presence of triphenylphosphine ligand and carboxylic acid additive. Selectivities up to 45:1 (C-5:C-4) can be achieved by running the reaction in non-polar solvents. A thorough study of scope and limitations shows good general tolerance of aryl bromide substitution. However, limitations on tolerance of ortho-subsitution and protic functional groups were established. Together with a telescoped deprotection step this method presents a viable alternative for the synthesis of C-3 arylated pyrazole building blocks.
Trinuclear diamagnetic nickel(II) complexes with bridging 3-arylpyrazolato ligands
Salih, Kifah S. M.,Bergner, Susann,Kelm, Harald,Sun, Yu,Gruen, Anneken,Schmitt, Yvonne,Schoch, Roland,Busch, Mark,Deibel, Naina,Braese, Stefan,Sarkar, Biprajit,Bauer, Matthias,Gerhards, Markus,Thiel, Werner R.
, p. 6049 - 6059 (2014/01/06)
Orange-red trinuclear nickel(II) complexes are obtained by reacting Ni(ClO4)2(H2O)6 with 3(5)-arylpyrazoles in the presence of a base. Herein, the diamagnetic nickel centers are coordinated in a square-pyramidal manner by four pyrazolato ligands, each of which bridges two nickel sites. The structurally unique complexes were investigated by NMR, IR, fluorescence, and X-ray spectroscopy. All seven compounds described here were structurally elucidated by single-crystal X-ray diffraction. With 3(5)-ferrocenylpyrazole as the substrate, a nonametallic system that possesses six redox-active ferrocenyl moieties was obtained. The reactions of Ni(ClO4)2(H2O)6 with 3(5)-arylpyrazoles in the presence of a base lead to pyrazolate-bridged trinuclear nickel(II) complexes. This strategy allows the introduction of a broad variety of aromatic substituents such as redox-active sites or additional phosphine donors in the periphery of the trinuclear core. Copyright
