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7738917 
Journal Article 
[HSO3-pmim][CH3SO3] as an Efficient Catalyst for the Synthesis of 1,5-Benzodiazepine Derivatives under Ultrasound Irradiation 
Li, C; Hao, QH; Liu, H; Wang, C; Ma, J; Zhu, W 
2013 
Yes 
Asian Journal of Chemistry
ISSN: 0970-7077
EISSN: 0975-427X 
Chemical Publishing Co. 
SAHIBABAD 
25 
11 
6243-6246 
English 
WOS:000325089600086 
1,5-Benzodiazepine derivatives were synthesized in moderate to excellent isolated yields by the condensation reactions of o-phenylenediamine and ketones catalyzed by [1-methyl-3-(3-sulphopropyl)imidazolium methyl sulphate] under ultrasound irradiation using n-hexane as solvent. This method is simple, effective and gives better yields. 
1-Methyl-3-(3-sulphopropyl)imidazolium methyl sulphate; 1,5-Benzodiazepines; o-Phenylenediamines; Ultrasound