Indium(III) Bromide: A Novel and Efficient Reagent for the Rapid Synthesis of 1,5-Benzodiazepines under Solvent-Free Conditions
作者:J. S. Yadav、B. V. Reddy、S. Praveenkumar、K. Nagaiah
DOI:10.1055/s-2004-834939
日期:——
o-Phenylenediamines (OPDA) undergo rapid condensation with ketones having hydrogens at the α-position in the presence of 10 mol% indium(III) bromide under extremely mild reaction conditions to afford the corresponding 1,5-benzodiazepines in excellent yields with high selectivity. The remarkable features of this new procedure are high conversions, short reaction times, cleaner reaction profiles, high
Ag<sub>3</sub>PW<sub>12</sub>O<sub>40</sub>: A Novel and Recyclable Heteropoly Acid for the Synthesis of 1,5-Benzodiazepines under Solvent-Free Conditions
作者:J. S. Yadav、B. V. Reddy、S. Praveenkumar、K. Nagaiah、N. Lingaiah、P. S. Saiprasad
DOI:10.1055/s-2004-816013
日期:——
o-Phenylenediamines undergo smooth condensation with ketones having hydrogens at α-position on the surface of heteropoly acid (Ag3PW12O40) under extremely mild conditions to afford the corresponding 1,5-benzodiazepines in excellent yields with high selectivity. The catalyst can be recovered by simple filteration and can be reused in subsequent reactions.
Ceric ammonium nitrate was found to be an efficient reagent for the preparation of 1,5-benzodiazepine derivatives of a wide range of substituted o-phenylenediamines and electronically divergent ketones in moderate to excellent isolated yields (60-98%) under mild conditions using methanol as solvent at ambient temperature.
Formation of Benzodiazepines and Pyrazinylquinoxalines from
Aromatic and Heteroaromatic Ketones via Deoximation
作者:J.H. Song、S.M. Bae、E.J. Lee、J.H. Cho、D.I. Jung
DOI:10.14233/ajchem.2020.22639
日期:——
However, direct reactions of o-phenylenediamine with oximes (acetone oxime, acetophenone oxime, and benzophenone oxime) as ketone equivalents did not occur. In the course of present investigations, it is found that dichloroamine-T can be an efficient reagent for the conversion of oximes into the corresponding carbonyl compounds. As a part of a research program related to the synthetic study of pharmacologically
Highly Efficient Zinc Oxide Nanoparticles Catalyzed Green Synthesis of 1,5-Benzodiazepines under Solvent-Free Path
作者:Yuhao Zhao、Xuejie Yu、Manpreet Saini、Yanxu Ma、Rajesh K. Singh
DOI:10.14233/ajchem.2014.18319
日期:——
An efficient and simple environment-friendly method for the preparation of substituted 1,5-benzodiazepines as biologically interesting compounds under heterogenous catalyst is described. The one-pot multicomponent condensation of o-phenylene-diamine and substituted ketones catalyzed by zinc oxide nanoparticles (ZnO NPs) under microwave under solvent-free condition has been developed. The present protocol provides a green and improved pathway for the synthesis of 1,5-benzodiazepines in terms of excellent yields, short reaction times and reusability of catalyst.