Synthesis of 2-Substituted Benzimidazoles and 1,5-Disubstituted Benzodiazepines on Alumina and Zirconia Catalysts
作者:M. REKHA、A. HAMZA、B.R. VENUGOPAL、N. NAGARAJU
DOI:10.1016/s1872-2067(11)60338-0
日期:2012.2
In this study, alumina, zirconia, manganese oxide/alumina, and manganese oxide/zirconia have been investigated for their catalytic activity in the condensation reaction between o-phenylenediamine and an aldehyde or a ketone to synthesise 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines respectively. Surface area, surface acidity, and morphology of the catalysts have been analysed
Synthesis of 1-H-1,5-benzodiazepines derivatives using SiO2/ZnCl2
作者:Raquel G. Jacob、Cátia S. Radatz、Mariele B. Rodrigues、Diego Alves、Gelson Perin、Eder J. Lenardão、Lucielli Savegnago
DOI:10.1002/hc.20674
日期:——
A general and easy method for the synthesis of several 1-H-1,5-benzodiazepines using SiO2/ZnCl2 under solvent-free conditions is described. This efficient and improved method furnishes selectively and in good yields the corresponding 1-H-1,5-benzodiazepines derivatives starting from o-phenylenediamine and cyclic or acyclicketones. The catalytic system was reused up four times, and the use of focused
RuCl<sub>3</sub>·<i>x</i>H<sub>2</sub>O: A Novel and Efficient Catalyst for the Facile Synthesis of 1,5-Benzodiazepines Under Solvent-Free Conditions
作者:Suresh、Anil Saini、Jagir S. Sandhu
DOI:10.1080/00397910802109273
日期:2008.8.29
Abstract 1,5-Benzodizepines are synthesized in excellent yields via condensation of o-phenylenediamine with ketones having a hydrogen at the α-position. The reaction is performed in solvent-freeconditions and 5 mol% of RuCl3·xH2O is enough to direct the reaction to completion.
Alum-Catalyzed One-Pot Solventless Synthesis of 1,5-Benzodiazepines
作者:Deepali Mahajan、Tahira Naqvi、Rattan Lal Sharma、Kamal K. Kapoor
DOI:10.1071/ch07316
日期:——
Alum [KAl(SO4)2∙12H2O] was found to be an efficient, non-toxic, cheap, and environmentally benign catalyst for the synthesis of 1,5-benzodiazepines, in good to excellent yields, from the condensation of 1 mole of o-phenylenediamine with 2 moles of ketone under solvent-free conditions.
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