Microwave-Assisted, Solvent Free Preparation of 1,5-Benzodiazepine Derivatives Using Nanomagnetic-Supported Sulfonic Acid as a Recyclable and Heterogeneous Catalyst
Multisite Solid Catalyst for Cascade Reactions: The Direct Synthesis of Benzodiazepines from Nitro Compounds
作者:Maria J. Climent、Avelino Corma、Sara Iborra、Laura L. Santos
DOI:10.1002/chem.200900492
日期:2009.9.7
Substituted 1,5‐benzodiazepines are selectively synthesized in one pot from substituted nitroaromatics and ketones. The reaction is performed in the presence of hydrogen and in the absence of solvent by using a bifunctional solidcatalyst with a chemoselective hydrogenation functional group capable of reducing the nitro group to a diamino group and an acid functional group, which catalyzes the cyclocondensation
NBS as an efficient catalyst for the synthesis of 1,5-benzodiazepine derivatives under mild conditions
作者:Chun-Wei Kuo、Shivaji V. More、Ching-Fa Yao
DOI:10.1016/j.tetlet.2006.09.128
日期:2006.11
Various biologically important 1,5-benzodiazepinederivatives were efficiently synthesized in excellent yields using catalytic amounts of NBS (10 mol %). This inexpensive, nontoxic, and readily available catalyst efficiently catalyzes the condensation of several aromatic as well as aliphatic ketones with substituted o-phenylenediamines.
Chitosan-supported Fe3O4 nanoparticles: a magnetically recyclable heterogeneous nanocatalyst for the syntheses of multifunctional benzimidazoles and benzodiazepines
作者:Ali Maleki、Nakisa Ghamari、Maryam Kamalzare
DOI:10.1039/c3ra47366j
日期:——
An environmentally benign and clean biopolymer-based heterogeneous nanocatalyst was prepared and its properties and morphology were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). Then, its catalytic activity was investigated in two important organic reactions. In these reactions, efficient and selective syntheses of 1,2-disubstituted benzimidazole and 1,5-benzodiazepine derivatives were carried out using 1,2-diamines and aldehydes or ketones in the presence of a catalytic amount of magnetically recoverable chitosan-supported iron oxide nanoparticles (Fe3O4/chitosan), as a biodegradable nanocomposite, in ethanol at ambient temperature in high yields. The Fe3O4/chitosan nanocatalyst can be recovered easily and reused without any significant loss of the catalytic activity.
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
1,5-Benzodiazepine synthesis via cyclocondensation of 1,2-diamines with ketones using iron-based metal–organic framework MOF-235 as an efficient heterogeneous catalyst
作者:Thuan D. Le、Khoa D. Nguyen、Vu T. Nguyen、Thanh Truong、Nam T.S. Phan
DOI:10.1016/j.jcat.2015.10.026
日期:2016.1
heterogeneous catalyst for the synthesis of 1,5-benzodiazepines by the cyclocondensation of 1,2-diamines with ketones. Excellent conversions to 1,5-benzodiazepines were achieved in the presence of 5 mol% MOF-235 catalyst using molecular oxygen in air as the stoichiometric oxidant. The Fe-MOF exhibited higher catalytic activity for the cyclocondensation reaction than those of other MOFs including MOF-5, Mn(BDC)