2,3-Dihydro-1H-1,5-benzodiazepines have been synthesized in good to excellent yield from direct condensations of o-phenylenediamines with ketones promoted by sulfamic acid at room temperature under neat condition or in acetonitrile.
Expeditious Entry to 1,5-Benzodiazepines Catalyzed by Sulfamic Acid at Room Temperature in Tap Water Suspension
2,3-Dihydro-1H-1,5-benzodiazepines have been synthesized in tap water suspension as well as in neat condition in good to excellent yield from direct condensations of o-phenylenediamines with ketones promoted by sulfamic acid at room temperature.
An Organocatalyzed and Ultrasound Accelerated Expeditious Synthetic Route to 1,5-Benzodiazepines under Solvent-Free Conditions
作者:Pravin V. Shinde、Bapurao B. Shingate、Murlidhar S. Shingare
DOI:10.5012/bkcs.2011.32.4.1179
日期:2011.4.20
In the present work, successful implementation of ultrasound irradiations for the rapid synthesis of 1,5benzodiazepine derivatives under solvent-free conditions is demonstrated. Use of a novel catalyst i.e. camphor sulphonic acid in combination with ultrasound technique is reported for the first time. Comparative study for the synthesis of 1,5-benzodiazepines using conventional as well as ultrasonication