Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (5): 734-741.DOI: 10.1016/S1872-2067(14)60304-1

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Efficient, environmentally benign, one-pot procedure for the synthesis of 1, 5-benzodiazepine derivatives using N-methyl-2-pyrrolidonium hydrogen sulphate as an ionic liquid catalyst under solvent-free conditions

Hossein Naeimi, Hossein Foroughi   

  1. Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, 87317, Iran
  • Received:2014-12-22 Revised:2015-01-23 Online:2015-04-17 Published:2015-04-17
  • Contact: Hossein Naeimi

Abstract:

A powerful and environmentally benign method has been developed for the one-pot synthesis of 4-substituted-1,5-benzodiazepines via the three-component reaction of a series of aldehydes with dimedone and o-phenylenediamine using [H-NMP][HSO4] as a Brönsted acidic ionic liquid catalyst under solvent-free conditions. The key benefits of this new method over existing techniques include high yields, the use of a green catalyst, short reaction times and facile catalyst separation.

Key words: Ionic liquid, Benzodiazepine, Solvent-free conditions, Dimedone