Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (15): 1655-1659.DOI: 10.6023/A1202122 Previous Articles     Next Articles

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空气下无配体钯催化二苯胺和卤代芳烃的C—N偶联

张斌彬, 詹丹, 张小平, 向沁洁, 曾庆乐   

  1. 成都理工大学 材料与化学化工学院 绿色催化合成研究所 成都 610059
  • 投稿日期:2012-02-12 发布日期:2012-05-18
  • 通讯作者: 曾庆乐 E-mail:qinglezeng@hotmail.com
  • 基金资助:

    项目受四川省国际科技合作与交流研究计划项目(No. 2011HH0016)、成都理工大学优秀创新团队培育计划(No. HY0084)和地质灾害防治与地质环境保护国家重点实验室开放基金(No. SKLGP2012K005)资助.

Ligand-free Pd-Catalyzed C—N Coupling of Diphenylamine and Aryl Halides under Air

Zhang Binbin, Zhan Dan, Zhang Xiaoping, Xiang Qinjie, Zeng Qingle   

  1. Institute of Green Catalysis and Synthesis, College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059
  • Received:2012-02-12 Published:2012-05-18
  • Supported by:

    Project supported by the International Sci-tech Cooperation and Exchange Research of Sichuan Province (No. 2011HH0016), Incubation Program for Excellent Innovation Team of Chengdu University of Technology (No. HY0084), Opening Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (No. SKLGP2012K005).

Triphenylamine derivatives are extensively used as a number of organic dyes, drugs, intermediates, dye-sensitized solar cells (DSSCs) and organic electroluminescence materials. It is valuable to discover a new synthetic method of triphenylamines with mild reaction conditions, easy-operation, and cheap starting materials. During our research of C—H bond activation, accidentally we found palladium acetate accomplished the C—N cross coupling of diphenylamine and 4-nitrobromobenzene under air. This discovery meets one of hot research topics of modern organic chemistry, that is, transition-metal-catalyzed reactions which must operate under inert atmosphere in the traditional procedures now can be performed under air. Consequently, ligand-free Pd(OAc)2-catalyzed C—N cross coupling of diphenylamines and aryl halides under air for synthesis of triphenylamines was studied in details. The effect of catalyst loading, base, additives, solvents and reaction time on this transformation was investigated. The optimized conditions were as follows: Pd(OAc)2 (3 mol%), K2CO3 (1.5 equiv.), heated at 90 ℃ in DMSO under air. Electron-withdrawing group of phenyl bromides and electron-donating group of diphenylamine benefit the coupling reaction, and among them, 4-nitrotriphenylamine gave yield up to 93%. Compared with traditional methods, the reactions were conducted under air and mild conditions in absence of ligand, that is, anhydrous and oxygen-free conditions are not required, and operation is extremely easy.

Key words: ligand-free, under air, palladium catalysis, triphenylamines, 4-nitrotriphenylamine, C—N cross coupling