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1
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Sikdar P, Choudhuri T, Paul S, Das S, Bagdi AK. K 2S 2O 8-Promoted Consecutive Tandem Cyclization/Oxidative Halogenation: Access to 3-Halo-Pyrazolo[1,5- a]pyrimidines. ACS OMEGA 2023; 8:23851-23859. [PMID: 37426282 PMCID: PMC10323951 DOI: 10.1021/acsomega.3c02270] [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: 04/04/2023] [Accepted: 06/09/2023] [Indexed: 07/11/2023]
Abstract
A one-pot methodology has been developed to synthesize 3-halo-pyrazolo[1,5-a]pyrimidine derivatives through the three-component reaction of amino pyrazoles, enaminones (or chalcone), and sodium halides. The use of easily accessible 1,3-biselectrophilic reagents like enaminones and chalcone offers a straightforward approach for the synthesis of 3-halo-pyrazolo[1,5-a]pyrimidines. The reaction proceeded through a cyclocondensation reaction between amino pyrazoles with enaminones/chalcone in the presence of K2S2O8 followed by oxidative halogenations by NaX-K2S2O8. Mild and environmentally benign reaction conditions, wide functional group tolerance, and scalability of the reaction are the attractive facet of this protocol. The combination of NaX-K2S2O8 is also beneficial for the direct oxidative halogenations of pyrazolo[1,5-a]pyrimidines in water.
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2
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Tang S, Shen Q, He P, Li J, Yang J, Si X, Xia J, Han Y, Li Z, Liu C, Gui QW. Synthesis of esters from 2-phenylimidazo[1,2-a]pyridines using visible light. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.133140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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3
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Dai PF, Xu H. Novel Chlorination of Imidazo‐Fused Heterocycles via Dichloro(aryl)‐λ3‐iodanes. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Peng-Fei Dai
- First Affiliated Hospital of Anhui Medical University Department of Nuclear Medicine 218 Jixi Road 230022 Hefei CHINA
| | - Huiqin Xu
- First Affiliated Hospital of Anhui Medical University Department of Nuclear Medicine 230022 NanJing CHINA
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4
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Jiang H, Shen H, Zhu S, Wang B, Yang Y, Nong Z, Yi M, Tang S, Gui QW. Diethylaminosulfur Trifluoride: A Novel, Low-Cost, Stable Double Thiolation Reagent for Imidazo[1,2-α]pyridines. ACS OMEGA 2021; 6:26273-26281. [PMID: 34660986 PMCID: PMC8515576 DOI: 10.1021/acsomega.1c03291] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 08/05/2021] [Indexed: 05/08/2023]
Abstract
We report a novel, inexpensive double thiolation reagent that sulfurizes a broad range of imidazo[1,2-α]pyridines under mild conditions. Importantly, diethylaminosulfur trifluoride, as a common nucleophilic fluorinating reagent, was utilized as a novel thiolation reagent.
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Affiliation(s)
- Hongmei Jiang
- College
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
- State
Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry
and Chemical Engineering, Hunan University, Changsha 410082, People’s Republic of China
| | - Haicheng Shen
- College
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Sha Zhu
- College
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Binbin Wang
- College
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Yujie Yang
- College
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Zhibin Nong
- College
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Min Yi
- College
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Shiyun Tang
- College
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
- China
Yunnan Key Laboratory of Tobacco Chemistry, Research and Development
Center, China Tobacco Yunnan Industrial
Company, Kunming 650231, People’s Republic of China
| | - Qing-Wen Gui
- College
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
- State
Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry
and Chemical Engineering, Hunan University, Changsha 410082, People’s Republic of China
- ,
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5
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Yang H, Huang N, Wang N, Shen H, Teng F, Liu X, Jiang H, Tan MC, Gui QW. Ultrasound-Assisted Iodination of Imidazo[1,2-α]pyridines Via C-H Functionalization Mediated by tert-Butyl Hydroperoxide. ACS OMEGA 2021; 6:25940-25949. [PMID: 34660956 PMCID: PMC8515396 DOI: 10.1021/acsomega.1c02645] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Accepted: 08/05/2021] [Indexed: 05/15/2023]
Abstract
A novel metal catalyst-free and environmentally friendly method for the regioselective iodination of imidazo[1,2-α]pyridines at their C3 position is disclosed, which has a wide substrate scope and could be sustainable. This reaction proceeds through ultrasound acceleration in the presence of a green alcohol solvent. Compared with a conventional heating system, the reaction efficiency and the rate are significantly improved and the iodine atom economy is maximized using ultrasound techniques.
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Affiliation(s)
- Hua Yang
- College
of Bioscience and Biotechnology, Hunan Agricultural
University, Changsha 410128, People’s Republic
of China
| | - Ning Huang
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Nengqing Wang
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Haicheng Shen
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Fan Teng
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Xiaoying Liu
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Hongmei Jiang
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Mei-Chen Tan
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Qing-Wen Gui
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
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6
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Liu Z, Zhang B, Yang X, Wang N, Wang J. Aminomethylation of imidazopyridines with dichloromethane: A general strategy to construct 3-aminomethlylated imidazoheterocycles. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153230] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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