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Zhou Y, Ma R, Li X, Liu X, Wang KH, Wang J, Huang D, Hu Y. Tandem Addition/Cyclization/Halogenation Reaction of Difluoromethylated N-Acylhydrazones with Allyltrimethylsilanes. J Org Chem 2023. [PMID: 38057279 DOI: 10.1021/acs.joc.3c02174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
As novel difluoromethyl building blocks, difluoromethylated N-acylhydrazones react with allyltrimethylsilanes and the halogen source via a tandem addition/cyclization/halogenation strategy, which produces various difluoromethylpyrazoline compounds in good yields. The method features mild reaction conditions, broad substrate scopes, and a transition metal-free process with easy operation. It also proves that difluoromethylated N-acylhydrazones are useful difluoromethyl building blocks for the construction of difluoromethylated nitrogen heterocycles.
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Affiliation(s)
- Yuxiu Zhou
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Ransong Ma
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Xiaoyong Li
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Xiaokang Liu
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Ke-Hu Wang
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Junjiao Wang
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Danfeng Huang
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Yulai Hu
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
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2
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Wang J, Shang Y, Zhao X, Cui Z, Li Y, Wang KH, Huang D, Hu Y, Wang N, Feng L. The cyclization/rearrangement of α-hydroxy ketones with trifluoromethyl N-acylhydrazones to synthesize multi-substituted trifluoromethyloxazolines. Chem Commun (Camb) 2023; 59:14293-14296. [PMID: 37964766 DOI: 10.1039/d3cc03854h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2023]
Abstract
A highly efficient and metal-free [3+2] cyclization/rearrangement reaction toward the synthesis of multisubstituted trifluoromethyloxazolines from α-hydroxyketones and trifluoromethyl N-acylhydrazones has been developed. The unprecedented rearrangement of the amide fragment under acidic conditions after cleavage of the N-N bond of acylhydrazones has opened up new avenues for the development of reactions involving trifluoromethyl N-acylhydrazones. DFT calculations show that the mechanism involves multiple proton transfer processes.
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Affiliation(s)
- Junjiao Wang
- College of Chemistry and Chemical Engineering, Northwest Normal University Lanzhou, P. R. China.
| | - Yongwei Shang
- College of Chemistry and Chemical Engineering, Northwest Normal University Lanzhou, P. R. China.
| | - Xiujuan Zhao
- College of Chemistry and Chemical Engineering, Northwest Normal University Lanzhou, P. R. China.
| | - Zhenli Cui
- College of Chemistry and Chemical Engineering, Northwest Normal University Lanzhou, P. R. China.
| | - Yang Li
- College of Chemistry and Chemical Engineering, Northwest Normal University Lanzhou, P. R. China.
| | - Ke-Hu Wang
- College of Chemistry and Chemical Engineering, Northwest Normal University Lanzhou, P. R. China.
| | - Danfeng Huang
- College of Chemistry and Chemical Engineering, Northwest Normal University Lanzhou, P. R. China.
| | - Yulai Hu
- College of Chemistry and Chemical Engineering, Northwest Normal University Lanzhou, P. R. China.
| | - Na Wang
- Gansu Computation Center, Lanzhou 730000, P. R. China
| | - Lei Feng
- Gansu Computation Center, Lanzhou 730000, P. R. China
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Dongxu Z. Trifluoromethylated hydrazones and acylhydrazones as potent nitrogen-containing fluorinated building blocks. Beilstein J Org Chem 2023; 19:1741-1754. [PMID: 38025086 PMCID: PMC10667715 DOI: 10.3762/bjoc.19.127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Accepted: 11/03/2023] [Indexed: 12/01/2023] Open
Abstract
Nitrogen-containing organofluorine derivatives, which are prepared using fluorinated building blocks, are among the most important active fragments in various pharmaceutical and agrochemical products. This review focuses on the reactivity, synthesis, and applications of fluoromethylated hydrazones and acylhydrazones. It summarizes recent methodologies that have been used for the synthesis of various nitrogen-containing organofluorine compounds.
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Affiliation(s)
- Zhang Dongxu
- Department of Fire Protection Engineering, China Fire and Rescue Institute, Beijing 102202, P. R. of China
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4
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Feng Y, Chang B, Ren Y, Zhao F, Wang KH, Wang J, Huang D, Lv X, Hu Y. Synthesis of trifluoromethylpyrrolopyrazole derivatives via [3+2] cycloaddition of trifluoromethyl N-acylhydrazones or trifluoroacetohydrazonoyl bromides with maleimides. Tetrahedron 2023. [DOI: 10.1016/j.tet.2023.133353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
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Liu X, Liu H, Bian C, Wang KH, Wang J, Huang D, Su Y, Lv X, Hu Y. Synthesis of 3-Trifluoromethyl-1,2,4-triazolines and 1,2,4-Triazoles via Tandem Addition/Cyclization of Trifluoromethyl N-Acylhydrazones with Cyanamide. J Org Chem 2022; 87:5882-5892. [PMID: 35412831 DOI: 10.1021/acs.joc.2c00176] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A tandem addition/cyclization reaction between trifluoromethyl N-acylhydrazones and cyanamide is described, which provides a novel and efficient process for the synthesis of polysubstituted 3-trifluoromethyl-1,2,4-triazolines and their derivatives. The method has the advantages of mild reaction conditions, a broad substrate scope, good product yields, and atom economy.
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Affiliation(s)
- Xiaoling Liu
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, China
| | - Haimei Liu
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, China
| | - Chang Bian
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, China
| | - Ke-Hu Wang
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, China
| | - Junjiao Wang
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, China
| | - Danfeng Huang
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, China
| | - Yingpeng Su
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, China
| | - Xiaobo Lv
- Shanghai Sinofluoro Chemicals Co., Ltd., Shanghai 201321, China
| | - Yulai Hu
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, China.,State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
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6
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Yang M, Huang D, Wang K, Han T, Zhao P, Wang F, Wang J, Su Y, Hu Y. Silver-Catalyzed Synthesis of CF 3-Substituted 2-Imidazolines. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202111009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Lv Y, Meng J, Li C, Wang X, Ye Y, Sun K. Update on the Synthesis of N‐Heterocycles via Cyclization of Hydrazones (2017–2021). Adv Synth Catal 2021. [DOI: 10.1002/adsc.202101184] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Yunhe Lv
- College of Chemistry and Chemical Engineering Anyang Normal University Anyang 4550008 People's Republic of China
| | - Jianping Meng
- College of Chemistry and Chemical Engineering Yantai University Yantai 264005 People's Republic of China
| | - Chen Li
- College of Chemistry and Chemical Engineering Yantai University Yantai 264005 People's Republic of China
| | - Xin Wang
- College of Chemistry and Chemical Engineering Yantai University Yantai 264005 People's Republic of China
| | - Yong Ye
- College of Chemistry Zhengzhou University Zhengzhou 450001 People's Republic of China
| | - Kai Sun
- College of Chemistry and Chemical Engineering Yantai University Yantai 264005 People's Republic of China
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Yang J, Huang D, Wang K, Wang J, Su Y, Deng Z, Yang T, Hu Y. Study on N-Alkylation Reactions of Trifluoromethylated Acylhydrazones. CHINESE J ORG CHEM 2021. [DOI: 10.6023/cjoc202011001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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