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Sumran G, Jain N, Kumar P, Aggarwal R. Trifluoromethyl-β-dicarbonyls as Versatile Synthons in Synthesis of Heterocycles. Chemistry 2024; 30:e202303599. [PMID: 38055226 DOI: 10.1002/chem.202303599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 12/01/2023] [Accepted: 12/04/2023] [Indexed: 12/07/2023]
Abstract
Trifluoromethyl group relishes a privileged position in the realm of medicinal chemistry because its incorporation into organic molecules often enhances the bioactivity by altering pharmacological profile of molecule. Trifluoromethyl-β-dicarbonyls have emerged as pivotal building blocks in synthetic organic chemistry due to their facile accessibility, stability and remarkable versatility. Owing to presence of nucleophilic and electrophilic sites, they offer multifunctional sites for the reaction. This review covers a meticulous exploration of their multifaceted role, encompassing an in-depth analysis of mechanism, extensive scope, limitations and wide-ranging applications in diverse organic synthesis, covering the literature from the 21st century. This comprehensive review encapsulates the applications of trifluoromethyl-β-dicarbonyls and their synthetic equivalents as precursors of complex and diverse heterocyclic scaffolds, fused heterocycles and spirocyclic compounds having medicinal and material importance. Their potent synthetic utility in cyclocondensation reactions with binucleophiles, cycloaddition reactions, C-C bond formations, asymmetric multicomponent reactions using classical/solvent-free/catalytic synthesis have been presented. Influence of unsymmetrical trifluoromethyl-β-diketones on regioselectivity of transformation is also reviewed. This review will benefit the synthetic and pharmaceutical communities to explore trifluoromethyl-β-dicarbonyls as trifluoromethyl building blocks for fabrication of heterocyclic scaffolds having implementation into drug discovery programs in the imminent future.
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Affiliation(s)
- Garima Sumran
- Department of Chemistry, D. A. V. College (Lahore), Ambala City, 134 003, Haryana, India
| | - Naman Jain
- Department of Chemistry, Kurukshetra University, Kurukshetra, 136 119, India
| | - Prince Kumar
- Department of Chemistry, Kurukshetra University, Kurukshetra, 136 119, India
| | - Ranjana Aggarwal
- Department of Chemistry, Kurukshetra University, Kurukshetra, 136 119, India
- CSIR-National Institute of Science Communication and Policy Research, New Delhi, 110012, India
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Pereira G, Mittersteiner M, Bonacorso HG, Martins MAP, Zanatta N. Regiocontrolled Synthesis of 1-Substituted-3(5)-carboxyalkyl-1 H-pyrazoles Using Trichloromethyl Enones. ACS OMEGA 2023; 8:17274-17287. [PMID: 37214703 PMCID: PMC10193424 DOI: 10.1021/acsomega.3c01879] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Accepted: 04/21/2023] [Indexed: 05/24/2023]
Abstract
In this work, we present a regiocontrolled methodology to prepare 1-substituted-3(5)-carboxyalkyl-1H-pyrazoles using trichloromethyl enones as starting materials. It was found that the selectivity of the reaction depends on the nature of the hydrazine: when using arylhydrazine hydrochlorides, synthesis of the 1,3-regioisomer was achieved (22 examples, 37-97% yields), while the corresponding free hydrazine led exclusively to the 1,5-regioisomer (12 examples, 52-83% yields). The trichloromethyl group was used as a precursor for the carboxyalkyl moiety, furnishing a one-pot three-component regioselective protocol suitable for preparing both isomers at moderate to excellent yields. The selectivity of the reaction was investigated through NMR analyses and the structures of the products were unambiguously determined by SCXR analyses.
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3
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Zanatta N, Mittersteiner M, Aquino EC, Budragchaa T, Wessjohann LA, Bonacorso HG, Martins MAP. Synthesis of Methylene-Bridged Trifluoromethyl Azoles Using 5-(1,2,3-Triazol-1-yl)enones. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/s-0040-1719837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
AbstractA protocol for synthesizing triazole-containing pyrazolines and pyrazoles selectively using trifluoromethylated 5-(1,2,3-triazol-1-yl)enones as starting materials, is reported. The selectivity of the reaction was controlled by the nature of the hydrazine or derivative used: free hydrazines furnished the 1,5-regiosiomer exclusively in yields up to 98%, whereas protected hydrazines provided the 1,3-regioisomer in yields up to 77%. To demonstrate the synthetic versatility of the triazole-based enone, reactions with other unsymmetrical dinucleophiles (hydroxylamine hydrochloride and S-methyl isothiourea sulfates) allowed the selective preparation of triazole-containing isoxazoline and pyrimidine rings.
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Affiliation(s)
- Nilo Zanatta
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria
| | - Mateus Mittersteiner
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria
- Department of Bioorganic Chemistry, Leibniz-Institute of Plant Biochemistry
| | - Estefania C. Aquino
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria
| | | | | | - Helio G. Bonacorso
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria
| | - Marcos A. P. Martins
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria
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Mittersteiner M, Farias FFS, Bonacorso HG, Martins MAP, Zanatta N. Ultrasound-assisted synthesis of pyrimidines and their fused derivatives: A review. ULTRASONICS SONOCHEMISTRY 2021; 79:105683. [PMID: 34562732 PMCID: PMC8473776 DOI: 10.1016/j.ultsonch.2021.105683] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 07/12/2021] [Accepted: 07/20/2021] [Indexed: 06/09/2023]
Abstract
The pyrimidine scaffold is present in many bioactive drugs; therefore, efficient synthetic routes that provide shorter reaction times, higher yields, and site-selective reactions are constantly being sought. Ultrasound (US) irradiation has emerged as an alternative energy source in the synthesis of these heterocyclic scaffolds, and over the last ten years there has been a significant increase in the number of publications mentioning US in either the construction or derivatization of the pyrimidine core. This review presents a detailed summary (with 140 references) of the effects of US (synergic or not) on the construction and derivatization of the pyrimidine core through classical reactions (e.g., multicomponent, cyclocondensation, cycloaddition, and alkylation reactions). The main points that were taken into consideration are as follows: chemo- and regioselectivity issues, and the results of conventional heating methods compared to US and mechanistic insights that are also presented and discussed for key reactions.
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Affiliation(s)
- Mateus Mittersteiner
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Brazil.
| | - Fellipe F S Farias
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Brazil
| | - Helio G Bonacorso
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Brazil
| | - Marcos A P Martins
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Brazil
| | - Nilo Zanatta
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, Brazil.
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5
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Vieira JC, Villetti MA, Frizzo CP. Thermal stability and decomposition mechanism of dicationic imidazolium-based ionic liquids with carboxylate anions. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115618] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Mittersteiner M, Andrade VP, Bonacorso HG, Martins MAP, Zanatta N. The Wonderful World of β‐Enamino Diketones Chemistry. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001039] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Mateus Mittersteiner
- Núcleo de Química de Heterociclos (NUQUIMHE) Departmento de Química Universidade Federal de Santa Maria 97105‐900 Santa Maria RS Brazil
| | - Valquiria P. Andrade
- Núcleo de Química de Heterociclos (NUQUIMHE) Departmento de Química Universidade Federal de Santa Maria 97105‐900 Santa Maria RS Brazil
| | - Helio G. Bonacorso
- Núcleo de Química de Heterociclos (NUQUIMHE) Departmento de Química Universidade Federal de Santa Maria 97105‐900 Santa Maria RS Brazil
| | - Marcos A. P. Martins
- Núcleo de Química de Heterociclos (NUQUIMHE) Departmento de Química Universidade Federal de Santa Maria 97105‐900 Santa Maria RS Brazil
| | - Nilo Zanatta
- Núcleo de Química de Heterociclos (NUQUIMHE) Departmento de Química Universidade Federal de Santa Maria 97105‐900 Santa Maria RS Brazil
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7
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Supramolecular self-assembly and thermodynamic properties of 5-aryl-1-(1,1-dimethylethyl)-1H-pyrazoles in the crystalline state. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.06.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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8
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Obydennov DL, Khammatova LR, Eltsov OS, Sosnovskikh VY. A chemo- and regiocontrolled approach to bipyrazoles and pyridones via the reaction of ethyl 5-acyl-4-pyrone-2-carboxylates with hydrazines. Org Biomol Chem 2019; 16:1692-1707. [PMID: 29451283 DOI: 10.1039/c7ob02725g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Chemo- and regiocontrolled syntheses of pyrazoles and pyridones are presented on the basis of 4-pyrones. A novel approach towards highly functionalized 3,4'-bipyrazoles has been developed by using reactions of ethyl 5-acylcomanoates with hydrazines. The acid-promoted double cyclocondensation allows switching of the structure of the pyrazole rings easily through changing both the nature of hydrazine and the reaction conditions. The transformation of 4-pyrones with phenylhydrazine in EtOH at -20 °C leads to hydroxypyridones as monoaddition products which can be used as precursors for the preparation of pyridone and pyrazole derivatives. A novel rearrangement of 2-hydroxypyridone to pyrazolyl-1,3-diketones in DMSO was found. The structure and regiochemistry of bipyrazoles were confirmed by X-ray analysis and 2D NMR experiments.
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Affiliation(s)
- D L Obydennov
- Institute of Natural Sciences and Mathematics, Ural Federal University, 51 Lenina Ave., 620000 Ekaterinburg, Russian Federation.
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9
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Topchiy MA, Zharkova DA, Asachenko AF, Muzalevskiy VM, Chertkov VA, Nenajdenko VG, Nechaev MS. Mild and Regioselective Synthesis of 3-CF3
-Pyrazoles by the AgOTf-Catalysed Reaction of CF3
-Ynones with Hydrazines. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800208] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Maxim A. Topchiy
- A. V. Topchiev Institute of Petrochemical Synthesis; Russian Academy of Sciences; Leninsky Prospect 29 Moscow Russia
| | - Daria A. Zharkova
- A. V. Topchiev Institute of Petrochemical Synthesis; Russian Academy of Sciences; Leninsky Prospect 29 Moscow Russia
- Department of Chemistry; Moscow State University; Leninskie Gory 119992 Moscow Russia
| | - Andrey F. Asachenko
- A. V. Topchiev Institute of Petrochemical Synthesis; Russian Academy of Sciences; Leninsky Prospect 29 Moscow Russia
| | | | | | | | - Mikhail S. Nechaev
- A. V. Topchiev Institute of Petrochemical Synthesis; Russian Academy of Sciences; Leninsky Prospect 29 Moscow Russia
- Department of Chemistry; Moscow State University; Leninskie Gory 119992 Moscow Russia
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10
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Salbego PS, Bender CR, Hörner M, Zanatta N, Frizzo CP, Bonacorso HG, Martins MAP. Insights on the Similarity of Supramolecular Structures in Organic Crystals Using Quantitative Indexes. ACS OMEGA 2018; 3:2569-2578. [PMID: 31458545 PMCID: PMC6641303 DOI: 10.1021/acsomega.7b02057] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2017] [Accepted: 02/21/2018] [Indexed: 05/05/2023]
Abstract
The quest for concepts of isostructurality in organic crystals has been long and mostly based on geometric data, even with the development of modern software. This field of study is of great interest to the pharmaceutical industry and for the prediction of crystal structures. Despite this, there is still no methodology that provides broad quantitative and comparable similarity data between two complete crystalline structures. The present study demonstrated that the similarity between two crystalline structures could be estimated from the similarity between the two "supramolecular clusters". Quantitative indexes for similarity comparisons of crystal structures were shown using nine 5-aryl-1-(1,1-dimethylethyl)-1H-pyrazoles as a model. This proposal includes the quantitative data of a geometric parameter (I D), a contact area parameter (I C), and an energetic parameter (I G). The proposed indexes exhibited good perspective regarding the similarity data and distinct regions of similarity. The range of similarity was set at I X ≥ 0.80, 0.80 > I X > 0.60, and I X ≤ 0.60 (X = D, C, or G). Indexes with a value near 1.0 indicate systems with isostructural, isocontact, and isoenergetic behavior. The results indicated that supramolecular structures with high similarity must have high values for all three indexes (I D, I C, and I G).
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Affiliation(s)
- Paulo
R. S. Salbego
- Núcleo
de Química de Heterociclos (NUQUIMHE) and Núcleo
de Investigação de Triazenos e Complexos (NITRICO),
Department of Chemistry, Federal University
of Santa Maria (UFSM), CEP 97105-900 Santa Maria, Rio Grande do Sul, Brazil
| | - Caroline R. Bender
- Núcleo
de Química de Heterociclos (NUQUIMHE) and Núcleo
de Investigação de Triazenos e Complexos (NITRICO),
Department of Chemistry, Federal University
of Santa Maria (UFSM), CEP 97105-900 Santa Maria, Rio Grande do Sul, Brazil
| | - Manfredo Hörner
- Núcleo
de Química de Heterociclos (NUQUIMHE) and Núcleo
de Investigação de Triazenos e Complexos (NITRICO),
Department of Chemistry, Federal University
of Santa Maria (UFSM), CEP 97105-900 Santa Maria, Rio Grande do Sul, Brazil
| | - Nilo Zanatta
- Núcleo
de Química de Heterociclos (NUQUIMHE) and Núcleo
de Investigação de Triazenos e Complexos (NITRICO),
Department of Chemistry, Federal University
of Santa Maria (UFSM), CEP 97105-900 Santa Maria, Rio Grande do Sul, Brazil
| | - Clarissa P. Frizzo
- Núcleo
de Química de Heterociclos (NUQUIMHE) and Núcleo
de Investigação de Triazenos e Complexos (NITRICO),
Department of Chemistry, Federal University
of Santa Maria (UFSM), CEP 97105-900 Santa Maria, Rio Grande do Sul, Brazil
| | - Helio G. Bonacorso
- Núcleo
de Química de Heterociclos (NUQUIMHE) and Núcleo
de Investigação de Triazenos e Complexos (NITRICO),
Department of Chemistry, Federal University
of Santa Maria (UFSM), CEP 97105-900 Santa Maria, Rio Grande do Sul, Brazil
| | - Marcos A. P. Martins
- Núcleo
de Química de Heterociclos (NUQUIMHE) and Núcleo
de Investigação de Triazenos e Complexos (NITRICO),
Department of Chemistry, Federal University
of Santa Maria (UFSM), CEP 97105-900 Santa Maria, Rio Grande do Sul, Brazil
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11
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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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12
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Muzalevskiy VM, Rulev AY, Romanov AR, Kondrashov EV, Ushakov IA, Chertkov VA, Nenajdenko VG. Selective, Metal-Free Approach to 3- or 5-CF3-Pyrazoles: Solvent Switchable Reaction of CF3-Ynones with Hydrazines. J Org Chem 2017. [DOI: 10.1021/acs.joc.7b00774] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
| | - Alexander Yu. Rulev
- A.
E. Favorsky Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Str., Irkutsk 664033, Russia
| | - Alexey R. Romanov
- A.
E. Favorsky Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Str., Irkutsk 664033, Russia
| | - Evgeniy V. Kondrashov
- A.
E. Favorsky Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Str., Irkutsk 664033, Russia
| | - Igor A. Ushakov
- A.
E. Favorsky Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Str., Irkutsk 664033, Russia
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13
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Martins MAP, Zimmer GC, Rodrigues LV, Orlando T, Buriol L, Alajarin M, Berna J, Frizzo CP, Bonacorso HG, Zanatta N. Competition between the donor and acceptor hydrogen bonds of the threads in the formation of [2]rotaxanes by clipping reaction. NEW J CHEM 2017. [DOI: 10.1039/c7nj02443f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The steric effect of thet-butyl group of 1′5′-thread prevents the formation of [2]rotaxane. On the other hand, the 1′3′-thread acts a template to obtain [2]rotaxanes.
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Affiliation(s)
- Marcos A. P. Martins
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria
- 97105-900 Santa Maria
- Brazil
| | - Geórgia C. Zimmer
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria
- 97105-900 Santa Maria
- Brazil
| | - Leticia V. Rodrigues
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria
- 97105-900 Santa Maria
- Brazil
| | - Tainára Orlando
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria
- 97105-900 Santa Maria
- Brazil
| | - Lilian Buriol
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria
- 97105-900 Santa Maria
- Brazil
| | - Mateo Alajarin
- Departamento de Química Orgánica, Facultad de Química, Universidad de Murcia
- E-30100 Murcia
- Spain
| | - Jose Berna
- Departamento de Química Orgánica, Facultad de Química, Universidad de Murcia
- E-30100 Murcia
- Spain
| | - Clarissa P. Frizzo
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria
- 97105-900 Santa Maria
- Brazil
| | - Helio G. Bonacorso
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria
- 97105-900 Santa Maria
- Brazil
| | - Nilo Zanatta
- Núcleo de Química de Heterociclos (NUQUIMHE), Departamento de Química, Universidade Federal de Santa Maria
- 97105-900 Santa Maria
- Brazil
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14
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Rulev AY, Romanov AR. Unsaturated polyfluoroalkyl ketones in the synthesis of nitrogen-bearing heterocycles. RSC Adv 2016. [DOI: 10.1039/c5ra23759a] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
This review focuses on the recent achievements and new developments in the synthesis of polyfluorinated aza-heterocycles based on fluorine-bearing enones and ynones published in the last decade.
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Affiliation(s)
- A. Yu. Rulev
- A. E. Favorsky Institute of Chemistry
- Siberian Division of the Russian Academy of Sciences
- Irkutsk 664033
- Russia
| | - A. R. Romanov
- A. E. Favorsky Institute of Chemistry
- Siberian Division of the Russian Academy of Sciences
- Irkutsk 664033
- Russia
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Maruoka H, Hokao M, Masumoto E, Okabe F, Tanaka R, Miake F, Fujioka T, Yamagata K. Chemical Reactivity and Application of 4-Alkylidene-3H-pyrazol-3-ones: Synthesis and Antifungal Activity of Polysubstituted Pyrazoles. HETEROCYCLES 2016. [DOI: 10.3987/com-15-s(t)13] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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16
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Kaur K, Kumar V, Gupta GK. Trifluoromethylpyrazoles as anti-inflammatory and antibacterial agents: A review. J Fluor Chem 2015. [DOI: 10.1016/j.jfluchem.2015.08.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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17
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An efficient route to 3-trifluoromethylpyrazole via cyclization/1,5-H shift and its applications in the synthesis of bioactive compounds. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.09.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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18
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Solvent- and Transition Metal Catalyst-Dependent Regioselectivity in the [3+2] Cyclocondensation of Trifluoromethyl-α,β-ynones with Hydrazines: Switchable Access to 3- and 5-Trifluoromethylpyrazoles. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201400853] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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19
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Synthesis, cyclooxygenase inhibition, and anti-inflammatory evaluation of novel diarylheterocycles with a central pyrazole, pyrazoline, or pyridine ring. Med Chem Res 2015. [DOI: 10.1007/s00044-015-1327-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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20
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Bazhin DN, Chizhov DL, Röschenthaler GV, Kudyakova YS, Burgart YV, Slepukhin PA, Saloutin VI, Charushin VN. A concise approach to CF3-containing furan-3-ones, (bis)pyrazoles from novel fluorinated building blocks based on 2,3-butanedione. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.08.046] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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21
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Frizzo CP, Scapin E, Marzari MRB, München TS, Zanatta N, Bonacorso HG, Buriol L, Martins MAP. Ultrasound irradiation promotes the synthesis of new 1,2,4-triazolo[1,5-a]pyrimidine. ULTRASONICS SONOCHEMISTRY 2014; 21:958-62. [PMID: 24394386 DOI: 10.1016/j.ultsonch.2013.12.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2013] [Revised: 11/28/2013] [Accepted: 12/11/2013] [Indexed: 05/14/2023]
Abstract
Ultrasonic irradiation was used in the synthesis of a series of novel 1,2,4-triazolo[1,5-a]pyrimidines. The products were synthetized from the cyclocondensation reaction of 1,1,1-trifluoro-4-metoxy-3-alken-2-one [CF3C(O)CHC(R)OMe, where R=Ph, 4-F-C6H4, 4-Br-C6H4, 4-I-C6H4, 4-CH3-C6H4, 4-CH3O-C6H4, Thien-2-yl, Biphen-4-yl] or β-enaminones [RC(O)CHCHNMe2, where R=Ph, 4-F-C6H4, 4-Br-C6H4, 4-I-C6H4, 4-CH3-C6H4, 4-CH3O-C6H4, 4-NO2-C6H4, Thien-2-yl, Biphen-4-yl, Naphth-2-yl, Pyrrol-2-yl, CCl3] with 5-amino-1,2,4-triazole in acetic acid at 99°C with 5-17 min of ultrasound irradiation. This methodology has shown several advantages, such as shorter reaction times, mild conditions, high regioselectivity, and excellent yields, when compared with conventional thermal heating (oil bath).
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Affiliation(s)
- Clarissa P Frizzo
- Núcleo de Química de Heterociclos, Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Elisandra Scapin
- Núcleo de Química de Heterociclos, Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Mara R B Marzari
- Núcleo de Química de Heterociclos, Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Taiana S München
- Núcleo de Química de Heterociclos, Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Nilo Zanatta
- Núcleo de Química de Heterociclos, Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Helio G Bonacorso
- Núcleo de Química de Heterociclos, Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Lilian Buriol
- Núcleo de Química de Heterociclos, Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
| | - Marcos A P Martins
- Núcleo de Química de Heterociclos, Departamento de Química, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
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Martins MAP, Frizzo CP, Martins ACL, Tier AZ, Gindri IM, Meyer AR, Bonacorso HG, Zanatta N. Energetic and topological approach for characterization of supramolecular clusters in organic crystals. RSC Adv 2014. [DOI: 10.1039/c4ra06040g] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this work, an approach is proposed for understanding the crystal arrangements of organic compounds.
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Affiliation(s)
- Marcos A. P. Martins
- Núcleo de Química de Heterocicl1os (NUQUIMHE)
- Department of Chemistry
- Federal University of Santa Maria
- Santa Maria, Brazil
| | - Clarissa P. Frizzo
- Núcleo de Química de Heterocicl1os (NUQUIMHE)
- Department of Chemistry
- Federal University of Santa Maria
- Santa Maria, Brazil
| | - Anna C. L. Martins
- Núcleo de Química de Heterocicl1os (NUQUIMHE)
- Department of Chemistry
- Federal University of Santa Maria
- Santa Maria, Brazil
| | - Aniele Z. Tier
- Núcleo de Química de Heterocicl1os (NUQUIMHE)
- Department of Chemistry
- Federal University of Santa Maria
- Santa Maria, Brazil
| | - Izabelle M. Gindri
- Núcleo de Química de Heterocicl1os (NUQUIMHE)
- Department of Chemistry
- Federal University of Santa Maria
- Santa Maria, Brazil
| | - Alexandre R. Meyer
- Núcleo de Química de Heterocicl1os (NUQUIMHE)
- Department of Chemistry
- Federal University of Santa Maria
- Santa Maria, Brazil
| | - Helio G. Bonacorso
- Núcleo de Química de Heterocicl1os (NUQUIMHE)
- Department of Chemistry
- Federal University of Santa Maria
- Santa Maria, Brazil
| | - Nilo Zanatta
- Núcleo de Química de Heterocicl1os (NUQUIMHE)
- Department of Chemistry
- Federal University of Santa Maria
- Santa Maria, Brazil
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