Silica gel-supported sulfuric acid catalyzed synthesis of 1,5-benzodiazepine derivatives
作者:D. Shobha、M. Adharvana Chari、K. Mukkanti、K. H. Ahn
DOI:10.1002/jhet.174
日期:2009.9
Silica gel-supported sulfuricacid has been found to be an efficient catalyst for the synthesis of 1,5-benzodiazepines from o-phenylenediamine and ketones in acetonitrile solvent. This method is simple, effective, and environmentally friendly and gives better yields. Compared to the classical reaction conditions, this new method consistently has the advantage of excellent yields (80–97%) and short
Zirconium tetrachloride efficiently catalyzes the cyclocondensation reaction of o-phenylenediamine and a ketone in refluxing 1,2-dichloroethane to afford the corresponding 2,3-dihydro-1H-1,5-benzod...
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.
Efficient Method for the Synthesis of 1,5‐Benzodiazepine Derivatives Catalyzed by Monoammonium Salt of 12‐Tungstophosphoric Acid
作者:B. Y. Giri、B. L. A. Prabavathi Devi、K. Vijaya Lakshmi、R. B. N. Prasad、N. Lingaiah、P. S. Sai Prasad
DOI:10.1080/00397910600947999
日期:2006.12
salt of 12‐tungstophosphoricacid [(NH4)H2PW12O40] was found to be a practical, inexpensive, reusable, and efficient heterogeneous catalyst for the preparation of 1,5‐benzodiazepine derivatives of o‐phenylenediamine and ketones. The heteropolyacid‐based catalyst has the advantages of simple workup procedure, water insolubility with good activity, and high‐yielding reaction for the synthesis of 1,5‐benzodiazepine