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1
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Yang X, Guo X, Yuan X, Chen B. K 2S 2O 8-promoted rearrangement of nitrones for the synthesis of benzo[ d]oxazoles. Org Chem Front 2022. [DOI: 10.1039/d2qo00680d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
An efficient route for the synthesis of valuable benzoxazoles has been developed through self-oxidative cyclization with N–O bond cleavage.
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Affiliation(s)
- Xueying Yang
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou, Gansu, China
| | - Xin Guo
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, China
| | - Xinglong Yuan
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou, Gansu, China
| | - Baohua Chen
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou, Gansu, China
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2
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Chen G, You K, Gong X, Zhao F, Chen Z, Luo H. Solvent-free liquid-phase selective catalytic oxidation of toluene to benzyl alcohol and benzaldehyde over CeO2–MnOx composite oxides. REACT CHEM ENG 2022. [DOI: 10.1039/d1re00488c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel CeO2–MnOx composite oxide was prepared by the improved sol–gel method. The synergistic catalysis of Mn3+/Mn2+ and Ce4+/Ce3+ was responsible for the good catalytic performance in the liquid phase solvent-free selective oxidation of toluene.
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Affiliation(s)
- Gui Chen
- School of Chemical Engineering, Xiangtan University, Xiangtan 411105, P. R. China
- College of Chemistry and Materials, Huaihua University, Huaihua 418000, P. R. China
| | - Kuiyi You
- School of Chemical Engineering, Xiangtan University, Xiangtan 411105, P. R. China
- National & Local United Engineering Research Center for Chemical Process Simulation and Intensification, Xiangtan University, Xiangtan 411105, P. R. China
| | - Xiangbo Gong
- School of Chemical Engineering, Xiangtan University, Xiangtan 411105, P. R. China
| | - Fangfang Zhao
- School of Chemical Engineering, Xiangtan University, Xiangtan 411105, P. R. China
| | - Zhenpan Chen
- School of Chemical Engineering, Xiangtan University, Xiangtan 411105, P. R. China
| | - He'an Luo
- School of Chemical Engineering, Xiangtan University, Xiangtan 411105, P. R. China
- National & Local United Engineering Research Center for Chemical Process Simulation and Intensification, Xiangtan University, Xiangtan 411105, P. R. China
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3
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Xu J, Li Y, Ding T, Guo H. Metal-Free Chemoselective Oxidation of 4-Methylquinolines into Quinoline-4-Carbaldehydes. Chem Asian J 2021; 16:3114-3117. [PMID: 34472705 DOI: 10.1002/asia.202100704] [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: 06/27/2021] [Revised: 08/17/2021] [Indexed: 11/09/2022]
Abstract
A convenient protocol for the synthesis of quinoline-4-carbaldehydes via chemoselective oxidation of 4-methylquinolines using hypervalent iodine(III) reagents as oxidant is described. This method highlights metal-free and mild reaction conditions, nice yield, good functional group tolerance, and high chemoselectivity.
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Affiliation(s)
- Jincheng Xu
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai, 200438, P. R China
| | - Yang Li
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai, 200438, P. R China
| | - Tianling Ding
- Department of Hematology, Huashan Hospital, Fudan University, 12 Wulumuqi Middle Road, Shanghai, 200040, P. R China
| | - Hao Guo
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai, 200438, P. R China
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4
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Sheehy KJ, Bateman LM, Flosbach NT, Breugst M, Byrne PA. Identification of N‐ or O‐Alkylation of Aromatic Nitrogen Heterocycles and
N
‐Oxides Using
1
H–
15
N HMBC NMR Spectroscopy. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000329] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Kevin J. Sheehy
- School of Chemistry Analytical and Biological Chemistry Research Facility University College Cork Kane Building T12 K8AF Cork Ireland
| | - Lorraine M. Bateman
- School of Chemistry Analytical and Biological Chemistry Research Facility University College Cork Kane Building T12 K8AF Cork Ireland
- School of Pharmacy University College Cork Cork Ireland
- SSPC (Synthesis and Solid State Pharmaceutical Centre) Cork Ireland
| | - Niko T. Flosbach
- Department für Chemie Universität zu Köln Greinstraße 4 50939 Köln Germany
| | - Martin Breugst
- Department für Chemie Universität zu Köln Greinstraße 4 50939 Köln Germany
| | - Peter A. Byrne
- School of Chemistry Analytical and Biological Chemistry Research Facility University College Cork Kane Building T12 K8AF Cork Ireland
- SSPC (Synthesis and Solid State Pharmaceutical Centre) Cork Ireland
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5
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Shen L, Gao X, Luan N, Liu Z, Li J, Zou D, Wu Y, Wu Y. External oxidant-free alkylation of quinoline and pyridine derivatives. Org Biomol Chem 2020; 18:1738-1742. [PMID: 32077880 DOI: 10.1039/c9ob02653c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel and efficient method for the generation of alkyl radicals and the alkylation of quinoline and pyridine derivatives under mild conditions has been developed. This strategy allows the direct alkylation of heteroaromatics in the absence of an external oxidant. A preliminary mechanistic study suggests that the present reaction probably proceeds via an intermolecular HAT process.
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Affiliation(s)
- Linhua Shen
- College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou, People's Republic of China.
| | - Xianying Gao
- College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou, People's Republic of China.
| | - Nannan Luan
- College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou, People's Republic of China.
| | - Zhenwei Liu
- College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou, People's Republic of China.
| | - Jingya Li
- Tetranov Biopharm, LLC, and Collaborative Innovation Center of New Drug Research and Safety Evaluation, Zhengzhou, 450052, People's Republic of China
| | - Dapeng Zou
- College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou, People's Republic of China.
| | - Yangjie Wu
- College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou, People's Republic of China.
| | - Yusheng Wu
- College of Chemistry, Green Catalysis Center, Zhengzhou University, Zhengzhou, People's Republic of China. and Tetranov Biopharm, LLC, and Collaborative Innovation Center of New Drug Research and Safety Evaluation, Zhengzhou, 450052, People's Republic of China and Tetranov International, Inc., 100 Jersey Avenue, Suite A340, New Brunswick, NJ 08901, USA.
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