Nucleophilic Acylation of 4-Fluoronitrobenzene with Benzaldehyde Catalyzed by N-Heterocyclic Carbene

doi:10.6023/cjoc201503038

Chin. J. Org. Chem. ›› 2015, Vol. 35 ›› Issue (10): 2223-2228.DOI: 10.6023/cjoc201503038 Previous Articles Next Articles

Notes

N-杂环卡宾催化对氟硝基苯和苯甲醛的亲核酰基化反应研究

于凤丽^a, 鲁玉倩^a, 袁冰^a, 解从霞^a, 于世涛^b

a 青岛科技大学生态化工国家重点实验室培育基地青岛 266042;
b 青岛科技大学化工学院青岛 266042

收稿日期:2015-03-24 修回日期:2015-05-26 发布日期:2015-06-04
通讯作者: 解从霞 E-mail:xiecongxia@126.com
基金资助:
国家自然科学基金(No. 21006055)和北京分子科学国家实验室开放课题(No. 20140141)资助项目.

Nucleophilic Acylation of 4-Fluoronitrobenzene with Benzaldehyde Catalyzed by N-Heterocyclic Carbene

Yu Fengli^a, Lu Yuqian^a, Yuan Bing^a, Xie Congxia^a, Yu Shitao^b

a State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042;
b College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042

Received:2015-03-24 Revised:2015-05-26 Published:2015-06-04
Supported by:
Project supported by the National Natural Science Foundation of China (No. 21006055) and the Beijing National Laboratory for Molecular Sciences (No. 20140141).

1. Nucleophilic Acylation of 4-Fluoronitrobenzene with Benzaldehyde Catalyzed by N-Heterocyclic Carbene.PDF(3800KB)

Abstract

Imidazolium ionic liquids as the catalyst precursor of N-heterocyclic carbene (NHC) have been applied to catalyze the nucleophilic acylation of arylfluoride with aromatic aldehyde or aliphatic aldehyde. The acyl group can be directly introduced to the aromatic ring with an electron-withdrawing group. The reaction of 4-fluoronitrobenzene with benzaldehyde for the preparation of 4-nitrobenzophenone is selected as the model reaction. The mechanism of nucleophilic acylation catalyzed by NHC is proposed. The ionic liquid firstly is converted to NHC under the presence of alkali. NHC makes benzaldehyde carry through the umpolung, and the acyl of benzaldehyde as the nucleophilic group attacks the carbon atom bearing fluorine of 4-fluoronitrobenzene, followed by loss of the fluorine as an anion. Base-promoted eliminations of a proton and NHC from the intermediate take place to afford the target product of 4-nitrobenzophenone. The effects of the alkyl chain of the ionic liquid, the amount of ionic liquid, different solvent, the type of alkali, the amount of alkali, reaction temperature and reaction time on the catalytic reaction have been fully investigated. The selected optimal conditions are as follows: DMSO as the solvent, the ionic liquid 1 (R＝n-C₁₂H₂₅) as the catalyst precursor, potassium tert-butoxide as the alkali, the amount of the ionic liquid 33 mol%, the molar ratio of the ionic liquid to the alkali 1:4, reaction temperature 30 ℃ and reaction time 6 h. Under the above optimal conditions, the conversion of 4-fluoronitrobenzene is 93.0%, and the yield of 4-nitrobenzophenone is 88.6%. After the reaction, the ionic liquid is dried under vacuum and then can be directly reused. The recycling efficiency of the ionic liquid is investigated. The result showed that the yield of 4-nitrobenzophenone still could reach above 75% after 4 recycles of the ionic liquid. The study provides a new environmentally-friendly method for the direct introduction of the acyl group to the electron-deficient aromatic ring to synthesize the aromatic ketones with electron-withdrawing group.

Key words: nucleophilic acylation, N-heterocyclic carbene, umpolung, 4-fluoronitrobenzene, 4-nitrobenzophenone

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Yu Fengli, Lu Yuqian, Yuan Bing, Xie Congxia, Yu Shitao. Nucleophilic Acylation of 4-Fluoronitrobenzene with Benzaldehyde Catalyzed by N-Heterocyclic Carbene[J]. Chin. J. Org. Chem., 2015, 35(10): 2223-2228.

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N-杂环卡宾催化对氟硝基苯和苯甲醛的亲核酰基化反应研究

Nucleophilic Acylation of 4-Fluoronitrobenzene with Benzaldehyde Catalyzed by N-Heterocyclic Carbene

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