1
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Nguyen TVQ. Direct C7-H Arylation of Pyrazolo[1,5-a]azines with Aryl Chlorides. Chemistry 2023; 29:e202301485. [PMID: 37183726 DOI: 10.1002/chem.202301485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 05/12/2023] [Accepted: 05/15/2023] [Indexed: 05/16/2023]
Abstract
C7-Arylated pyrazolo[1,5-a]azines are important structural motifs with profound applications in drug and material research. Here, we report a general and straighforward synthesis of these bi(hetero)aryls via palladium-catalyzed direct C-H arylation, employing low-cost and abundant (hetero)aryl chlorides as the aryl source. The catalytic system is robust and covers a wide substrate scope regarding heteroarenes as well as (hetero)aryl chlorides, with possible extension to the C-H arylation of [1,2,4]triazolo[1,5-a]pyrimidines. This study also presents a rare example of using (hetero)aryl chlorides for the direct C-H arylation of six-membered heteroarenes.
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Affiliation(s)
- Thanh V Q Nguyen
- Medicinal Chemistry, Research and Early Development, Respiratory and Immunology, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden
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2
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Rubina SR, Stalin PR, Meenatchi CS, Murugesan S, Kumar RR. Synthesis of epiminocyclohepta[b]pyrazolo[4,3-e]pyridines from tropinone: Fluorescent “Turn on–off” chemosensors for the sequential detection of Al3+, Cd2+ and Pb2+ in nanomolar concentration. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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3
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Philippov I, Gatilov Y, Sonina A, Vorob’ev A. Oxidative [3+2]Cycloaddition of Alkynylphosphonates with Heterocyclic N-Imines: Synthesis of Pyrazolo[1,5- a]Pyridine-3-phosphonates. Molecules 2022; 27:molecules27227913. [PMID: 36432015 PMCID: PMC9694626 DOI: 10.3390/molecules27227913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 11/01/2022] [Accepted: 11/04/2022] [Indexed: 11/19/2022] Open
Abstract
A series of pyrazolo[1,5-a]pyridine-3-ylphosphonates were prepared with moderate to good yields by the oxidative [3+2]cycloaddition of 2-subtituted ethynylphosphonates with in situ generated pyridinium-N-imines and their annulated analogs. 2-Aliphatic and 2-Ph acetylenes demonstrate low activity, and the corresponding pyrazolopyridines were achieved with a moderate yield in the presence of 10 mol% Fe(NO3)3·9H2O. At the same time, tetraethyl ethynylbisphosphonate, diethyl 2-TMS- and 2-OPh-ethynylphosphonates possess much greater reactivity and the corresponding pyrazolo[1,5-a]pyridines, and their annulated derivatives were obtained with good to excellent yields without any catalyst. 2-Halogenated ethynylphosphonates also readily reacted with pyridinium-N-imines, forming complex mixtures containing poor amounts of 2-halogenated pyrazolopyridines.
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Affiliation(s)
- Igor Philippov
- Novosibirsk Institute of Organic Chemistry SB RAS, 9 Lavrentiev Avenue, 630090 Novosibirsk, Russia
| | - Yuriy Gatilov
- Novosibirsk Institute of Organic Chemistry SB RAS, 9 Lavrentiev Avenue, 630090 Novosibirsk, Russia
| | - Alina Sonina
- Novosibirsk Institute of Organic Chemistry SB RAS, 9 Lavrentiev Avenue, 630090 Novosibirsk, Russia
| | - Aleksey Vorob’ev
- Novosibirsk Institute of Organic Chemistry SB RAS, 9 Lavrentiev Avenue, 630090 Novosibirsk, Russia
- Department of Natural Science, Faculty of Organic Chemistry, Novosibirsk State University, 1 Pirogova Street, 630090 Novosibirsk, Russia
- Correspondence: ; Tel.: +7-952-9488714
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4
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Xiong L, Chen F, Wu Y, Hu X, Ruan Z, Jiang H, Zeng W. Cyclocarboamination of Alkynes with N-Aminopyridiniums by Photoredox Catalysis. Org Lett 2022; 24:7856-7860. [PMID: 36256581 DOI: 10.1021/acs.orglett.2c03336] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A visible-light photoredox-catalyzed reaction to access structurally diverse pyridoimidazoles has been developed. This transformation features intermolecular carboamination of N-sulfonylaminopyridiniums with a broad scope of alkynes.
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Affiliation(s)
- Li Xiong
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou510641, China
| | - Fengjuan Chen
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou510641, China
| | - Yihang Wu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou510641, China
| | - Xinwei Hu
- Key Laboratory of Molecular Target and Clinical Pharmacology and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou511436, China
| | - Zhixiong Ruan
- Key Laboratory of Molecular Target and Clinical Pharmacology and State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou511436, China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou510641, China
| | - Wei Zeng
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou510641, China
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5
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Hsiao PY, Chang R, Sue ACH, Chu JH, Liao GW, Lee YH, Huang JY. Synthesis and Mechanistic Investigation of Bipyrazolo[1,5- a]pyridines via Palladium-Catalyzed Cross-Dehydrogenative Coupling of Pyrazolo[1,5- a]pyridines. J Org Chem 2022; 87:9851-9863. [PMID: 35844185 DOI: 10.1021/acs.joc.2c00895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis of a range of 3,3'-bipyrazolo[1,5-a]pyridine derivatives via direct cross-dehydrogenative coupling of pyrazolo[1,5-a]pyridine precursors is herein presented. This simple and efficient methodology involving palladium(II)-catalyzed C-H bond activation showed good functional group tolerance and product yield (up to 94%). Through the mechanistic insights gained from both kinetic isotope effect experimental studies and density functional theory calculations, a plausible reaction mechanism was outlined. Furthermore, subsequent derivatizations of the resulting 7,7'-diaryl-3,3'-bipyrazolo[1,5-a]pyridines, executed by performing palladium-mediated ortho C-H bond activation followed by hypervalent iodine-induced chlorination, rendered this series of compounds more extended π-conjugation and twisted conformations. Our study on these bipyrazolo[1,5-a]pyridine-based luminogens provides new opportunities for tailor-made organic luminescent materials.
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Affiliation(s)
- Pu-Yen Hsiao
- Department of Applied Science, National Taitung University, Taitung 95092, Taiwan, R.O.C
| | - Rong Chang
- College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Andrew C-H Sue
- College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Jean-Ho Chu
- Department of Applied Science, National Taitung University, Taitung 95092, Taiwan, R.O.C
| | - Guan-Wei Liao
- Department of Applied Science, National Taitung University, Taitung 95092, Taiwan, R.O.C
| | - Yi-Hsin Lee
- Department of Applied Science, National Taitung University, Taitung 95092, Taiwan, R.O.C
| | - Jui-Yang Huang
- Department of Applied Science, National Taitung University, Taitung 95092, Taiwan, R.O.C
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6
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Jannapu Reddy R, Sharadha N, Haritha Kumari A. Base-mediated [3 + 2]-cycloannulation strategy for the synthesis of pyrazolo[1,5- a]pyridine derivatives using ( E)-β-iodovinyl sulfones. Org Biomol Chem 2022; 20:4331-4337. [PMID: 35451451 DOI: 10.1039/d2ob00499b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pyrazolo[1,5-a]pyridines continue to occupy a special place in medicinal chemistry, but the direct construction of 3-sulfonyl analogues remains unexplored. Under basic conditions, pyridinium-N-amine and the corresponding dipolar aminide played a vibrant role in [3 + 2]-cycloaddition using (E)-β-iodovinyl sulfones. K2CO3-mediated tandem cycloannulative-desulfonylation of (E)-β-iodovinyl sulfones with 1-aminopyridinium iodide is realized to access 2-substituted pyrazolo[1,5-a]pyridines in good to high yields. An essential modification of the dipolar N-tosylpyridinium imide allows the first preparative synthesis of 3-sulfonyl-pyrazolo[1,5-a]pyridines in moderate to high yields. Of note, the metal-free protocol features a broad substrate scope with good functional group tolerance and compatibility. The efficacy of the process was proved with gram-scale reactions, and a plausible mechanism is also presented based on concrete results.
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Affiliation(s)
- Raju Jannapu Reddy
- Department of Chemistry, University College of Science, Osmania University, Hyderabad 500 007, India.
| | - Nunavath Sharadha
- Department of Chemistry, University College of Science, Osmania University, Hyderabad 500 007, India.
| | - Arram Haritha Kumari
- Department of Chemistry, University College of Science, Osmania University, Hyderabad 500 007, India.
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7
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Liu L, Durai M, Doucet H. Transition Metal‐Catalyzed Regiodivergent C−H Arylations of Aryl‐Substituted Azoles. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Linhao Liu
- CNRS ISCR-UMR 6226 Univ Rennes 35000 Rennes France
| | | | - Henri Doucet
- CNRS ISCR-UMR 6226 Univ Rennes 35000 Rennes France
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8
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Nguyen TVQ, Poli L, Garrison AT. Palladium-catalyzed oxidative C-H/C-H cross-coupling of pyrazolo[1,5- a]azines with five-membered heteroarenes. Chem Commun (Camb) 2021; 58:827-830. [PMID: 34931645 DOI: 10.1039/d1cc06337e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The use of Pd(OAc)2 as the catalyst and AgOAc as the oxidant enabled the direct regioselective oxidative C-H/C-H cross-coupling of pyrazolo[1,5-a]pyrimidines or pyrazolo[1,5-a]pyridines with various five-membered heteroarenes without the need of pre-activation and/or directing groups. Successful coupling partners include thiophenes, benzothiophenes, thiazoles, furans, oxazoles, indoles and imidazo[1,2-a]pyridines.
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Affiliation(s)
- Thanh V Q Nguyen
- Department of Medicinal Chemistry, Research and Early Development, Respiratory and Immunology, BioPharmaceuticals R&D, AstraZeneca Pepparedsleden 1, 43183 Mölndal, Sweden.
| | - Lorenzo Poli
- Department of Medicinal Chemistry, Research and Early Development, Respiratory and Immunology, BioPharmaceuticals R&D, AstraZeneca Pepparedsleden 1, 43183 Mölndal, Sweden. .,University of Strasbourg, 4 Rue Blaise Pascal, 67081 Strasbourg, France
| | - Aaron T Garrison
- Department of Medicinal Chemistry, Research and Early Development, Respiratory and Immunology, BioPharmaceuticals R&D, AstraZeneca Pepparedsleden 1, 43183 Mölndal, Sweden.
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9
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Synthetic advances in C(sp2)-H/N–H arylation of pyrazole derivatives through activation/substitution. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Hsiao PY, Chu JH. Novel bipyrazolo[1,5- a]pyridine luminogens with aggregation-induced emission enhancement properties. Chem Commun (Camb) 2021; 57:12281-12284. [PMID: 34730135 DOI: 10.1039/d1cc05371j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A novel 3,3'-bipyrazolo[1,5-a]pyridine molecular scaffold was obtained as a product of serendipity. Both photophysical characterisations and HOMO-LUMO theoretical calculations indicate its potential as a promising fluorophore with notable intramolecular charge transfer. Nonetheless, the emission properties of this compound suffer from the typical aggregation-caused quenching effect. To overcome this situation, we introduced additional diaryl groups onto the skeleton and synthesised a series of 7,7'-diaryl-3,3'-bipyrazolo[1,5-a]pyridines via palladium-catalysed intermolecular C-H/C-H bond cross-coupling reaction in 35-62% yields. This series of tailor-made luminogens with twisted π-structures display aggregation-induced emission enhancement properties.
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Affiliation(s)
- Pu-Yen Hsiao
- Department of Applied Science, National Taitung University, Taitung, Taiwan 95092, Taiwan.
| | - Jean-Ho Chu
- Department of Applied Science, National Taitung University, Taitung, Taiwan 95092, Taiwan.
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11
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Faarasse S, El Brahmi N, Guillaumet G, El Kazzouli S. Regioselective C-H Functionalization of the Six-Membered Ring of the 6,5-Fused Heterocyclic Systems: An Overview. Molecules 2021; 26:5763. [PMID: 34641306 PMCID: PMC8510187 DOI: 10.3390/molecules26195763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Revised: 09/20/2021] [Accepted: 09/21/2021] [Indexed: 11/16/2022] Open
Abstract
The regioselective C-H functionalization of the five-membered ring of the 6,5-fused heterocyclic systems is nowadays well documented due to its high reactivity compared to the six-membered ring. So, developing new procedures of C-H functionalization of the six-membered ring "by thinking out of the box" is extremely challenging, which explains the limited number of reports published to date. This review paper aims to highlight advances achieved in this emerging chemistry research and discusses recently reported methods.
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Affiliation(s)
- Soukaina Faarasse
- Euromed Research Center, Euromed Faculty of Pharmacy, Euromed University of Fes, Route de Meknes, Fez 30000, Morocco; (S.F.); (N.E.B.); (G.G.)
- Institute of Organic and Analytical Chemistry, University of Orleans, UMR CNRS 7311, BP 6759, CEDEX 2, 45067 Orleans, France
| | - Nabil El Brahmi
- Euromed Research Center, Euromed Faculty of Pharmacy, Euromed University of Fes, Route de Meknes, Fez 30000, Morocco; (S.F.); (N.E.B.); (G.G.)
| | - Gérald Guillaumet
- Euromed Research Center, Euromed Faculty of Pharmacy, Euromed University of Fes, Route de Meknes, Fez 30000, Morocco; (S.F.); (N.E.B.); (G.G.)
- Institute of Organic and Analytical Chemistry, University of Orleans, UMR CNRS 7311, BP 6759, CEDEX 2, 45067 Orleans, France
| | - Saïd El Kazzouli
- Euromed Research Center, Euromed Faculty of Pharmacy, Euromed University of Fes, Route de Meknes, Fez 30000, Morocco; (S.F.); (N.E.B.); (G.G.)
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12
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MCM-41-supported palladium (II) α-diimine complex: A recyclable catalyst for Suzuki-Miyaura coupling reaction. RESULTS IN CHEMISTRY 2021. [DOI: 10.1016/j.rechem.2021.100189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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13
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Usami Y, Tatsui Y, Sumimoto K, Miyamoto A, Koito N, Yoneyama H, Harusawa S. 3-Trifluoromethanesulfonyloxy-4,7-dihydropyrazolo[1,5-a]pyridine via Ring-Closing Metathesis: Synthesis and Transformation to Withasomnine Homologs. HETEROCYCLES 2021. [DOI: 10.3987/com-20-s(k)13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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14
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Kumar A, Kumar M, Verma AK. Well-Defined Palladium N-Heterocyclic Carbene Complexes: Direct C-H Bond Arylation of Heteroarenes. J Org Chem 2020; 85:13983-13996. [PMID: 33064481 DOI: 10.1021/acs.joc.0c02024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of palladium N-heterocyclic carbene (NHC) complexes of type trans-{(NHC)PdCl2L} (L = C5H5N, 3-ClC5H4N, and PPh3) (3-5) have been developed as efficient precatalysts for direct C-H bond arylation of various heteroarenes. In particular, an in situ generated new NHC ligand derived from {1,3-di-(2,6-diethylphenyl)acenaphtho[1,2-d] imidazolium} chloride (2) is used for the stabilization of the palladium metal center. Among the screened palladium precatalysts (3-5), the most active PEPPSI themed complex (3) was successfully employed toward direct C-H bond arylation of various heteroarenes and aryl bromides. A range of functional groups on aryl bromides as well as on heteroarenes sustained throughout the standard reaction conditions for easy access of various arylated heterocyclic compounds. Significantly, the utility of the protocol was demonstrated by the effective synthesis of a precursor of raloxifene, a selective estrogen receptor modulator.
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Affiliation(s)
- Anuj Kumar
- Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Manoj Kumar
- Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Akhilesh K Verma
- Synthetic Organic Chemistry Research Laboratory, Department of Chemistry, University of Delhi, Delhi 110007, India
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15
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Chu JH, Su ZH, Yen KW, Chien HI. Investigation of Stepwise and Stoichiometric Palladium-Mediated ortho-C–H Bond Arylation and Alkylation of 9(10 H)-Acridinone. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00356] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Jean-Ho Chu
- Department of Applied Science, National Taitung University, Taitung 95092, Taiwan
| | - Zhe-Hong Su
- Department of Applied Science, National Taitung University, Taitung 95092, Taiwan
| | - Ko-Wang Yen
- Department of Applied Science, National Taitung University, Taitung 95092, Taiwan
| | - Hsuan-I Chien
- Department of Applied Science, National Taitung University, Taitung 95092, Taiwan
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16
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Surya Prakash Rao H, Gunasundari R, Muthukumaran J. Crystal structure analysis of ethyl 6-(4-meth-oxy-phen-yl)-1-methyl-4-methyl-sulfanyl-3-phenyl-1 H-pyrazolo-[3,4- b]pyridine-5-carboxyl-ate. Acta Crystallogr E Crystallogr Commun 2020; 76:1209-1212. [PMID: 32844001 PMCID: PMC7405588 DOI: 10.1107/s2056989020008841] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 06/30/2020] [Indexed: 11/10/2022]
Abstract
In the title compound, C24H23N3O3S, the dihedral angle between the fused pyrazole and pyridine rings is 1.76 (7)°. The benzene and meth-oxy phenyl rings make dihedral angles of 44.8 (5) and 63.86 (5)°, respectively, with the pyrazolo-[3,4-b] pyridine moiety. An intra-molecular short S⋯O contact [3.215 (2) Å] is observed. The crystal packing features C-H⋯π inter-actions.
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Affiliation(s)
- H. Surya Prakash Rao
- Department of Chemistry and Biochemistry, School of Basic Sciences and Research, Sharda University, Greater Noida 201306, India
- Department of Chemistry, Pondicherry University, Puducherry 605 014, India
| | | | - Jayaraman Muthukumaran
- Department of Biotechnology, School of Engineering and Technology, Sharda University, Greater Noida 201306, India
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17
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Synthesis of 3-Fluoropyrazolo[1,5-A]Pyridines by Fluorination of Methyl Pyrazolo[1,5-A]Pyridine-3-Carboxylates. Chem Heterocycl Compd (N Y) 2020. [DOI: 10.1007/s10593-020-02757-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Chao T, Su ZH, Yen KW, Wu MJ, Chu JH. Synthesis of Dibenzosuberones Bearing an Isoxazole Group via Palladium-Catalyzed Intramolecular C-H/C-Br Bond Cross-Coupling of Ortho-Aroylated 3,5-Diarylisoxazoles. J Org Chem 2020; 85:5559-5569. [PMID: 32212605 DOI: 10.1021/acs.joc.0c00346] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A facile and efficient synthetic methodology for preparing dibenzosuberones via a C-H bond activation strategy is presented. The ortho-aroylated 3,5-diarylisoxazole was employed as the starting substrate to undergo palladium-catalyzed intramolecular C-H/C-Br bond cross-coupling to produce a variety of dibenzosuberones bearing an isoxazole group in 24 to >99% 1H NMR yields. The dibenzosuberone structure was further confirmed by X-ray crystallography. The developed methodology exhibits very good functional group tolerance. In addition, a rational mechanism was presented for describing the reaction process. For the prepared dibenzosuberone, the use of Mo(CO)6 as the catalyst can easily transform the isoxazole ring into the β-aminoenone group. Finally, the structure of the anticipated ring-opening product, dibenzosuberenone, bearing a β-amino-α-ketone group was secured by X-ray crystallography.
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Affiliation(s)
- Tung Chao
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 804, Taiwan
| | - Zhe-Hong Su
- Department of Applied Science, National Taitung University, Taitung 95092, Taiwan
| | - Ko-Wang Yen
- Department of Applied Science, National Taitung University, Taitung 95092, Taiwan
| | - Ming-Jung Wu
- Department of Chemistry, National Sun Yat-sen University, Kaohsiung 804, Taiwan
| | - Jean-Ho Chu
- Department of Applied Science, National Taitung University, Taitung 95092, Taiwan
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19
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Rao HSP, Gunasundari R, Muthukumaran J. Crystal structure analysis of ethyl 3-(4-chloro-phen-yl)-1,6-dimethyl-4-methyl-sulfanyl-1 H-pyrazolo[3,4- b]pyridine-5-carboxyl-ate. Acta Crystallogr E Crystallogr Commun 2020; 76:443-445. [PMID: 32148891 PMCID: PMC7057362 DOI: 10.1107/s2056989020002479] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 02/20/2020] [Indexed: 11/13/2022]
Abstract
In the title compound, C18H18ClN3O2S, the dihedral angle between the fused pyrazole and pyridine rings is 3.81 (9)°. The benzene ring forms dihedral angles of 35.08 (10) and 36.26 (9)° with the pyrazole and pyridine rings, respectively. In the crystal, weak C-H⋯O hydrogen bonds connect mol-ecules along [100].
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Affiliation(s)
- H. Surya Prakash Rao
- Department of Chemistry and Biochemistry, School of Basic Sciences and Research, Sharda University, Greater Noida 201306, India
- Department of Chemistry, Pondicherry University, Puducherry 605014, India
| | | | - Jayaraman Muthukumaran
- Department of Biotechnology, School of Engineering and Technology, Sharda University, Greater Noida 201306, India
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20
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Naik NS, Shastri LA, Shastri SL, Chougala BM, Shaikh F, Madar JM, Kulkarni RC, Dodamani S, Jalalpure S, Joshi SD, Sunagar V. Synthesis of Polyfunctionalized Fused Pyrazolo-Pyridines: Characterization, Anticancer Activity, Protein Binding and Molecular Docking Studies. ChemistrySelect 2019. [DOI: 10.1002/slct.201802927] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Nirmala S. Naik
- Department of Chemistry; Karnatak University; Dharwad 580003
| | | | | | | | | | - Jyoti M. Madar
- Department of Chemistry; Karnatak University; Dharwad 580003
| | | | - Suneel Dodamani
- Dr. Prabhakar Kore Basic Science Research Center; KLE University; Belagavi 590010
| | - Sunil Jalalpure
- Dr. Prabhakar Kore Basic Science Research Center; KLE University; Belagavi 590010
- KLE University's College of Pharmacy; Belagavi 590010
| | - Shrinivas D. Joshi
- Department of Pharmaceutical Chemistry; S. E. T's College of Pharmacy; Dharwad 580002
| | - Vinay Sunagar
- Department of Chemistry; G. S. S. College; Belagavi 590010
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21
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Peng Y, He Q, Zhang X, Yang C. Pd-Catalyzed intramolecular C–H activation and C–S formation to synthesize pyrazolo[5,1- b]benzothiazoles without an additional oxidant. Org Chem Front 2019. [DOI: 10.1039/c9qo00484j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
An efficient synthesis of pyrazolo[5,1-b]benzothiazole scaffold via Pd-catalyzed intramolecular C–H activation and C–S formation was developed.
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Affiliation(s)
- Yingyuan Peng
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Science
- Shanghai 201203
- China
| | - Qian He
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Science
- Shanghai 201203
- China
| | - Xiaofei Zhang
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Science
- Shanghai 201203
- China
| | - Chunhao Yang
- State Key Laboratory of Drug Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Science
- Shanghai 201203
- China
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22
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Obulesu O, Murugesh V, Harish B, Suresh S. Tandem Aza Michael Addition-Vinylogous Nitroaldol Condensation: Construction of Highly Substituted N-Fused 3-Nitropyrazolopyridines. J Org Chem 2018; 83:6454-6465. [PMID: 29779367 DOI: 10.1021/acs.joc.8b00746] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A base-mediated tandem aza-Michael addition-vinylogous nitroaldol condensation has been described between 3,5-dialkyl 4-nitropyrazoles and alkynyl ketones/aldehydes. This transition metal-free atom economical transformation occurred via C-N and C═C bond formations in one step with the elimination of water. The construction of a variety of highly substituted N-fused 3-nitropyrazolopyridine derivatives has been demonstrated with good yields. Good to excellent regioselectivities have been achieved with unsymmetrically substituted 4-nitropyrazoles.
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Affiliation(s)
- Owk Obulesu
- Organic and Biomolecular Chemistry Division , CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad 500 007 , India.,Academy of Scientific and Innovative Research (AcSIR) , New Delhi 110 025 , India
| | - V Murugesh
- Organic and Biomolecular Chemistry Division , CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad 500 007 , India.,Academy of Scientific and Innovative Research (AcSIR) , New Delhi 110 025 , India
| | - Battu Harish
- Organic and Biomolecular Chemistry Division , CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad 500 007 , India.,Academy of Scientific and Innovative Research (AcSIR) , New Delhi 110 025 , India
| | - Surisetti Suresh
- Organic and Biomolecular Chemistry Division , CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad 500 007 , India.,Academy of Scientific and Innovative Research (AcSIR) , New Delhi 110 025 , India
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23
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Galenko AV, Shakirova FM, Galenko EE, Novikov MS, Khlebnikov AF. Fe(II)/Au(I) Relay Catalyzed Propargylisoxazole to Pyridine Isomerization: Access to 6-Halonicotinates. J Org Chem 2017; 82:5367-5379. [PMID: 28452217 DOI: 10.1021/acs.joc.7b00736] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient synthesis of methyl nicotinates/6-halonicotinates by the domino isomerization of 4-propargyl/(3-halopropargyl)-5-methoxyisoxazoles under Fe(II)/Au(I) relay catalysis was developed. It was found that FeNTf2 is an effective catalyst for first step of the domino isomerization, transformation of isoxazole to 2H-azirine, which is compatible with Ph3PAuNTf2, catalyzing the second step.
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Affiliation(s)
- Alexey V Galenko
- Saint Petersburg State University , Institute of Chemistry, 7/9 Universitetskaya nab., St. Petersburg, 199034 Russia
| | - Firuza M Shakirova
- Saint Petersburg State University , Institute of Chemistry, 7/9 Universitetskaya nab., St. Petersburg, 199034 Russia
| | - Ekaterina E Galenko
- Saint Petersburg State University , Institute of Chemistry, 7/9 Universitetskaya nab., St. Petersburg, 199034 Russia
| | - Mikhail S Novikov
- Saint Petersburg State University , Institute of Chemistry, 7/9 Universitetskaya nab., St. Petersburg, 199034 Russia
| | - Alexander F Khlebnikov
- Saint Petersburg State University , Institute of Chemistry, 7/9 Universitetskaya nab., St. Petersburg, 199034 Russia
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24
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Gemoets HPL, Kalvet I, Nyuchev AV, Erdmann N, Hessel V, Schoenebeck F, Noël T. Mild and selective base-free C-H arylation of heteroarenes: experiment and computation. Chem Sci 2017; 8:1046-1055. [PMID: 28451243 PMCID: PMC5356503 DOI: 10.1039/c6sc02595a] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 09/01/2016] [Indexed: 01/01/2023] Open
Abstract
A mild and selective C-H arylation strategy for indoles, benzofurans and benzothiophenes is described. The arylation method engages aryldiazonium salts as arylating reagents in equimolar amounts. The protocol is operationally simple, base free, moisture tolerant and air tolerant. It utilizes low palladium loadings (0.5 to 2.0 mol% Pd), short reaction times, green solvents (EtOAc/2-MeTHF or MeOH) and is carried out at room temperature, providing a broad substrate scope (47 examples) and excellent selectivity (C-2 arylation for indoles and benzofurans, C-3 arylation for benzothiophenes). Mechanistic experiments and DFT calculations support a Heck-Matsuda type coupling mechanism.
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Affiliation(s)
- Hannes P L Gemoets
- Department of Chemical Engineering and Chemistry , Micro Flow Chemistry & Process Technology , Eindhoven University of Technology , Den Dolech 2 , 5612 AZ Eindhoven , The Netherlands .
| | - Indrek Kalvet
- Institute of Organic Chemistry , RWTH Aachen University , Landoltweg 1 , 52074 Aachen , Germany .
| | - Alexander V Nyuchev
- Department of Chemical Engineering and Chemistry , Micro Flow Chemistry & Process Technology , Eindhoven University of Technology , Den Dolech 2 , 5612 AZ Eindhoven , The Netherlands .
- Department of Chemistry , N. I. Lobachevsky State University of Nizhny Novgorod , 23 Gagarin Avenue , 603950 Nizhny Novgorod , Russian Federation
| | - Nico Erdmann
- Department of Chemical Engineering and Chemistry , Micro Flow Chemistry & Process Technology , Eindhoven University of Technology , Den Dolech 2 , 5612 AZ Eindhoven , The Netherlands .
| | - Volker Hessel
- Department of Chemical Engineering and Chemistry , Micro Flow Chemistry & Process Technology , Eindhoven University of Technology , Den Dolech 2 , 5612 AZ Eindhoven , The Netherlands .
| | - Franziska Schoenebeck
- Institute of Organic Chemistry , RWTH Aachen University , Landoltweg 1 , 52074 Aachen , Germany .
| | - Timothy Noël
- Department of Chemical Engineering and Chemistry , Micro Flow Chemistry & Process Technology , Eindhoven University of Technology , Den Dolech 2 , 5612 AZ Eindhoven , The Netherlands .
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25
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Alam K, Kim SM, Kim DJ, Park JK. Development of Structurally Diverse N-Heterocyclic Carbene LigandsviaPalladium-Copper-Catalyzed Decarboxylative Arylation of Pyrazolo[1,5-a]pyridine-3-carboxylic Acid. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600480] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Khyarul Alam
- Department of Chemistry and Institute of Functional Materials; Pusan National University; Busan 609-735 Korea
| | - Seong Min Kim
- Department of Chemistry and Institute of Functional Materials; Pusan National University; Busan 609-735 Korea
| | - Do Joong Kim
- Department of Chemistry and Institute of Functional Materials; Pusan National University; Busan 609-735 Korea
| | - Jin Kyoon Park
- Department of Chemistry and Institute of Functional Materials; Pusan National University; Busan 609-735 Korea
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26
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Ouyang JS, Li YF, Shen DS, Ke Z, Liu FS. Bulky α-diimine palladium complexes: highly efficient for direct C–H bond arylation of heteroarenes under aerobic conditions. Dalton Trans 2016; 45:14919-27. [DOI: 10.1039/c6dt02544g] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Through the strategy to enhance the bulkiness on both the backbone and the N-aryl moieties, we designed and synthesized a type of bulky α-diimine palladium complex (i.e., {[Ar–NC(R)–C(R)N–Ar]PdCl2, (Ar = 2-benzhydryl-4,6-dimethylphenyl)}, C1, R = H; C2, R = An; C3, R = Ph).
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Affiliation(s)
- Jia-Sheng Ouyang
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- China
| | - Yan-Fang Li
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- China
| | - Dong-Sheng Shen
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- China
| | - Zhuofeng Ke
- School of Materials Science and Engineering
- MOE Key Laboratory of Bioinorganic and Synthetic Chemistry
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Feng-Shou Liu
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- China
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27
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Maes J, Maes BU. A Journey Through Metal-Catalyzed C H Functionalization of Heterocycles. ADVANCES IN HETEROCYCLIC CHEMISTRY 2016. [DOI: 10.1016/bs.aihch.2016.04.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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