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Fang X, Xie H, Huang H, Wang Y, Chen T, Yan Z, Yao H. The synthesis of aryl amines enabled by rearrangement and demethylaromatization of cyclohexadienimines. Org Biomol Chem 2024. [PMID: 39431912 DOI: 10.1039/d4ob01338g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2024]
Abstract
The rearrangement and demethylaromatization of cyclohexadienimines (namely cyclohexadienone imines) were investigated in detail under metal-free conditions. Treating 4-aryl-4-methylcyclohexadienimines with acyl chloride at 100 °C in dichloromethane led to the smooth formation of m-arylaniline derivatives in good to excellent yields, in which [1,2]-migration of the aryl group at C-4 occurred exclusively. The demethylaromatization of 4-aryl-4-methylcyclohexadienimines mediated by iodotriphenylphosphonium iodide (in situ prepared via the reaction of triphenylphosphine with iodine) in toluene at 100 °C proceeded well, generating p-arylanilines in moderate to good yields. An efficient and alternative method for the synthesis of polysubstituted aryl amines, especially m-arylaniline derivatives which are otherwise difficult to synthesize through traditional methods, was developed.
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Affiliation(s)
- Xueyu Fang
- College of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi, 330031, China.
| | - Hongyan Xie
- College of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi, 330031, China.
| | - Hongkun Huang
- College of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi, 330031, China.
| | - Yu Wang
- College of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi, 330031, China.
| | - Tian Chen
- Zhejiang Charioteer Pharmaceutical Co., Ltd, Xianju, Zhejiang 317321, China
| | - Zhaohua Yan
- College of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi, 330031, China.
| | - Hua Yao
- College of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi, 330031, China.
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Jia X, Tian X, Zhuang D, Wan Z, Gu J, Li Z. Copper-Catalyzed Intermolecular Cross-dehydrogenative C-N Coupling at Room Temperature via Remote Activating Group Enabled Radical Relay Strategy. Org Lett 2023; 25:2012-2017. [PMID: 36944029 DOI: 10.1021/acs.orglett.3c00267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
Employing N-fluorobenzenesulfonimide (NFSI) as a nitrogen-centered radical (NCR) precursor, an intermolecular C(sp2)-N coupling on heteroarenes or substituted benzenes with remote activated aniline derivatives via copper catalyzed N-N radical relay strategy at room temperature is developed. Good to excellent yields are acquired, and no ligand or additive is required. Reaction scope investigation and preliminary mechanistic studies demonstrate that the remote activating strategy and delicate control on the reactivities of active NCR species are essential to guarantee satisfactory chemo- and site-selectivity.
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Affiliation(s)
- Xiaoqi Jia
- Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China
| | - Xiangmin Tian
- Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China
| | - Dailin Zhuang
- Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China
| | - Zhenyang Wan
- Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China
| | - Jiahao Gu
- Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China
| | - Ziyuan Li
- Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China
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