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Design, synthesis, and structure of alkyl 1H-pyrazolecarboxylates from a raspberry ketone methyl ether. Chem Heterocycl Compd (N Y) 2020. [DOI: 10.1007/s10593-020-02816-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Mermer A. Microwave and ultrasound promoted greener synthesis of thiazolyl-pyrazoline derivatives and investigation of their biological activities. JOURNAL OF THE TURKISH CHEMICAL SOCIETY, SECTION A: CHEMISTRY 2019. [DOI: 10.18596/jotcsa.563286] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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3
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Simultaneous Ring-Opened THF and insertion of diazoketone derived carbene into carbonyl O-H: Synthesis for β-keto enol ethers. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.07.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Martins MAP, Marzari MRB, Frizzo CP, Zanatta M, Buriol L, Andrade VP, Zanatta N, Bonacorso HG. Comparative Study of the Regioselectivity and Reaction Media for the Synthesis of 1-tert-Butyl-3(5)-trifluoromethyl-1H-pyrazoles. European J Org Chem 2012. [DOI: 10.1002/ejoc.201201111] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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de Vasconcelos A, Oliveira PS, Ritter M, Freitag RA, Romano RL, Quina FH, Pizzuti L, Pereira CMP, Stefanello FM, Barschak AG. Antioxidant capacity and environmentally friendly synthesis of dihydropyrimidin-(2H)-ones promoted by naturally occurring organic acids. J Biochem Mol Toxicol 2012; 26:155-61. [PMID: 22447704 DOI: 10.1002/jbt.20424] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2011] [Revised: 11/12/2011] [Accepted: 11/24/2011] [Indexed: 11/07/2022]
Abstract
The Biginelli reaction is a multicomponent reaction involving the condensation between an aldehyde, a β-ketoester, and urea or thiourea, in the presence of an acid catalyst, producing dihydropyrimidinones (DHPMs). Owing to their important pharmacological properties, the DHPMs have been studied by many authors. However, most of the methodologies used for the synthesis of these compounds require drastic reaction conditions. In the current study, we report an efficient and clean procedure for preparing DHPMs by the use of citric acid or tartaric acid as a promoter of the Biginelli synthesis in ethanol as solvent. In addition, we have evaluated the antioxidant capacity of the compounds synthesized by the 2,2-diphenyl-1-picrylhydrazyl radical scavenging assay and the thiobarbituric acid-reactive species test. Two compounds presented antioxidant activity and also reduced lipid peroxidation at concentrations of 200 and 300 µM. In summary, we report an environmentally friendly procedure for the preparation of DHPMs and demonstrate the antioxidant capacity of some of the compounds.
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Affiliation(s)
- Alana de Vasconcelos
- Universidade Federal de Pelotas, Centro de Ciências Químicas, Farmacêuticas e Alimentos, Campus Universitário s/n, 96010-900, Capão do Leão, RS, Brazil
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Venzke D, Flores AFC, Quina FH, Pizzuti L, Pereira CMP. Ultrasound promoted greener synthesis of 2-(3,5-diaryl-4,5-dihydro-1H-pyrazol-1-yl)-4-phenylthiazoles. ULTRASONICS SONOCHEMISTRY 2011; 18:370-374. [PMID: 20728398 DOI: 10.1016/j.ultsonch.2010.07.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2010] [Accepted: 07/01/2010] [Indexed: 05/29/2023]
Abstract
A rapid and cleaner procedure for the synthesis of a series of 2-(3,5-diaryl-4,5-dihydro-1H-pyrazol-1-yl)-4-phenylthiazoles under ultrasonic irradiation in ethanol is described.
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Affiliation(s)
- Dalila Venzke
- Departamento de Química e Geociências, Universidade Federal de Pelotas, 96010-900 Pelotas, RS, Brazil
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Pizzuti L, Martins PLG, Ribeiro BA, Quina FH, Pinto E, Flores AFC, Venzke D, Pereira CMP. Efficient sonochemical synthesis of novel 3,5-diaryl-4,5-dihydro-1H-pyrazole-1-carboximidamides. ULTRASONICS SONOCHEMISTRY 2010; 17:34-37. [PMID: 19632139 DOI: 10.1016/j.ultsonch.2009.06.013] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2009] [Revised: 06/17/2009] [Accepted: 06/17/2009] [Indexed: 05/28/2023]
Abstract
An ultrasound-assisted preparation of a series of novel 3,5-diaryl-4,5-dihydro-1H-pyrazole-1-carboximidamides that proceeds via the efficient reaction of chalcones with aminoguanidine hydrochloride under clean conditions is described.
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Affiliation(s)
- Lucas Pizzuti
- Centro de Capacitação e Pesquisa em Meio Ambiente (CEPEMA-USP), Universidade de São Paulo, 11573-000 Cubatão, SP, Brazil
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Emelina EE, Petrov AA, Selivanov SI, Nelyubina YV, Antipin MY. Highly regioselective synthesis of trifluoromethyl derivatives of pyrazolo[1,5-a]pyrimidines bearing fused cycloalkane rings using (2-ethoxycycloalkenyl)-2,2,2-trifluoroethanones. J Fluor Chem 2009. [DOI: 10.1016/j.jfluchem.2009.06.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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9
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Martins MAP, Frizzo CP, Moreira DN, Buriol L, Machado P. Solvent-Free Heterocyclic Synthesis. Chem Rev 2009; 109:4140-82. [DOI: 10.1021/cr9001098] [Citation(s) in RCA: 518] [Impact Index Per Article: 34.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marcos A. P. Martins
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Clarissa P. Frizzo
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Dayse N. Moreira
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Lilian Buriol
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Pablo Machado
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
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Pizzuti L, Piovesan LA, Flores AFC, Quina FH, Pereira CMP. Environmentally friendly sonocatalysis promoted preparation of 1-thiocarbamoyl-3,5-diaryl-4,5-dihydro-1H-pyrazoles. ULTRASONICS SONOCHEMISTRY 2009; 16:728-31. [PMID: 19324584 DOI: 10.1016/j.ultsonch.2009.02.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2008] [Revised: 02/10/2009] [Accepted: 02/15/2009] [Indexed: 05/14/2023]
Abstract
An efficient and green synthesis of thiocarbamoyl-3,5-diaryl-4,5-dihydro-1H-pyrazoles via the condensation of chalcones with thiosemicarbazide in ethanol and KOH under ultrasound irradiation is reported. The products were isolated in good yields after short reaction times.
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Affiliation(s)
- Lucas Pizzuti
- Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
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Martins MAP, Muraro P, Beck P, Machado P, Frizzo CP, Zanatta N, Bonacorso HG. Simplified Approach to the Regiospecific Synthesis of Trichloromethylpyrazolines Using Microwave Irradiation. SYNTHETIC COMMUN 2008. [DOI: 10.1080/00397910802162926] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Marcos A. P. Martins
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
| | - Paulo Muraro
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
| | - Paulo Beck
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
| | - Pablo Machado
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
| | - Clarissa P. Frizzo
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
| | - Nilo Zanatta
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
| | - Helio G. Bonacorso
- a Department of Chemistry , Federal University of Santa Maria , Santa Maria, Brazil
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Microwave-assisted synthesis and antimicrobial activity of 5-trihalomethyl-3-arylisoxazoles. MONATSHEFTE FUR CHEMIE 2008. [DOI: 10.1007/s00706-007-0849-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Sauzem PD, Machado P, Rubin MA, da S Sant'anna G, Faber HB, de Souza AH, Mello CF, Beck P, Burrow RA, Bonacorso HG, Zanatta N, Martins MAP. Design and microwave-assisted synthesis of 5-trifluoromethyl-4,5-dihydro-1H-pyrazoles: Novel agents with analgesic and anti-inflammatory properties. Eur J Med Chem 2008; 43:1237-47. [PMID: 17889969 DOI: 10.1016/j.ejmech.2007.07.018] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2007] [Revised: 07/12/2007] [Accepted: 07/20/2007] [Indexed: 10/22/2022]
Abstract
In this work, we reported the synthesis and evaluation of the analgesic and anti-inflammatory properties of novel 3- or 4-substituted 5-trifluoromethyl-5-hydroxy-4,5-dihydro-1H-1-carboxyamidepyrazoles (where 3-/4-substituent=H/H, Me/H, Et/H, Pr/H, i-Pr/H, Bu/H, t-Bu/H, Ph/H, 4-Br-Ph/H and H/Me) designed in the exploration of the bioisosteric replacement of benzene present in salicylamide with a 5-trifluoromethyl-4,5-dihydro-1H-pyrazole scaffold. Target compounds were synthesized from the cyclocondensation of 4-alkoxy-1,1,1-trifluoromethyl-3-alken-2-ones with semicarbazide hydrochloride through a rapid one-pot reaction via microwave irradiation. In addition to spectroscopic data, the structure of the compounds was supported by X-ray diffraction. Subcutaneous administration of the 5-trifluoromethyl-4,5-dihydro-1H-pyrazoles decreased pain-related behavior during neurogenic and inflammatory phases of the formalin test in mice. Moreover, the more active analgesic compounds (3-/4-=Et/H and H/Me) significantly decreased carrageenan-induced paw edema in mice. The data obtained in this work suggest that the synthesized compounds could be promising candidates for the future development of novel analgesic and anti-inflammatory agents.
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Affiliation(s)
- Patricia D Sauzem
- Laboratório de Neurotoxicidade e Psicofarmacologia, Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil
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A simple one-pot synthesis of 3-alkoxy-3-cyanocarboxylic acids: a rapid entry to new GABA derivatives. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.07.060] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Martins MAP, Pereira CMP, Moura S, Frizzo CP, Beck P, Zanatta N, Bonacorso HG, Flores AFC. Microwave assisted regiospecific synthesis of 5-trifluoromethyl-4,5-dihydropyrazoles and-pyrazoles. J Heterocycl Chem 2007. [DOI: 10.1002/jhet.5570440537] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Bonacorso HG, Wentz AP, Lourega RV, Cechinel CA, Moraes TS, Flores AFC, Zanatta N, Martins MAP. Regiospecific synthesis of trichloromethyl substituted 4,5-dihydro-1h-1-tosylpyrazoles. J Heterocycl Chem 2007. [DOI: 10.1002/jhet.5570440139] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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17
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Bonacorso HG, Wentz AP, Lourega RV, Cechinel CA, Moraes TS, Coelho HS, Zanatta N, Martins MA, Höerner M, Alves SH. Trifluoromethyl-containing pyrazolinyl (p-tolyl) sulfones: The synthesis and structure of promising antimicrobial agents. J Fluor Chem 2006. [DOI: 10.1016/j.jfluchem.2006.05.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Rodriquez M, Taddei M. Synthesis of Heterocycles via Microwave-Assisted Cycloadditions and Cyclocondensations. TOPICS IN HETEROCYCLIC CHEMISTRY 2006. [DOI: 10.1007/7081_005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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Sanz D, Claramunt RM, Singh SP, Kumar V, Aggarwal R, Elguero J, Alkorta I. Structure of the products of condensation of hydroxylamine with trifluoromethyl-beta-diketones: assignments of the diastereotopic protons of the 4-methylene group in 5-hydroxy-5-trifluoromethyl-delta2-isoxazolines. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2005; 43:1040-1043. [PMID: 16155966 DOI: 10.1002/mrc.1676] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The combined use of 1H NMR spectroscopy with theoretical calculations of chemical shifts (GIAO) and coupling constants (B3LYP/6-311 ++G**) of a 5-hydroxy-5-trifluoromethyl-Delta2-isoxazoline has enabled solving the problem of the assignments of the diastereotopic protons in this compound. This result has been extended to 5-hydroxy-5-trifluoromethyl-Delta2-pyrazolines and the corresponding 5-trichloromethyl derivatives.
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Affiliation(s)
- Dionisia Sanz
- Departamento de Química Orgánica y Bio-Orgánica, Universidad Nacional de Educación a Distancia (UNED), Facultad de Ciencias, Senda del Rey 9, E-28040 Madrid, Spain.
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Bonacorso HG, Oliveira MR, Costa MB, Da Silva LB, Wastowski AD, Zanatta N, Martins MAP. Regiospecific one-pot synthesis of new trifluoromethyl substituted heteroaryl pyrazolyl ketones. J Heterocycl Chem 2005. [DOI: 10.1002/jhet.5570420424] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Chapter 5.4 Five membered ring systems: With more than one N atom. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/s0959-6380(05)80050-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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