Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (9): 1769.

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One-pot Biginelli Synthesis of Benzimidazo[2,1-b]quinazolin-6-ones in Ionic Liquid Phase Under Ultrasound Irradiation

ZHAO Xin-Hai, LIU Chen-Jiang*, LI Yan-Ping   

  1. Key Laboratory of Petroleum and Gas Fine Chemicals of Ministry of Education, Physics and Chemistry Detecting Center, School of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China
  • Received:2009-12-21 Online:2010-09-10 Published:2010-09-10
  • Contact: LIU Chen-Jiang. E-mail: pxylcj@126.com
  • Supported by:

    国家自然科学基金(批准号: 20662009, 20862016)资助.

Abstract: A novel series of benzimidazo[2,1-b]quinazolin-6-ones derivatives was synthesized by a three-component Biginelli condensation reaction of aldehydes, 2-aminobenzimidazole and 1,3-cyclohexanedione, employing ionic liquid[bmim]Br as a solvent under ultrasound irradiation. The classical Bignelli reaction has been extended by the use of 2-aminobenzimidazole and this method has the advantages of milder reaction conditions, short reaction time(0.5 h), good yields(65%—86%) and environmental benignity. The structures of the products were characterized by IR, 1H NMR spectra and elemental analysis.

Key words: Biginelli reaction, Benzimidazo[2,1-b]quinazolin-6-ones, Ultrasound irradiation, Ionic liquid

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