Construction of the 1,5-Benzodiazepine Skeleton from <i>o</i>-Phenylendiamine and Propargylic Alcohols via a Domino Gold-Catalyzed Hydroamination/Cyclization Process
The gold-catalyzed reaction of o-phenylendiamine with propargylic alcohols affords 1,5-benzodiazepines bearing different substituents on the 2 and 4 positions. The method allows even for the selective preparation of 4-substituted 1,5-benzodiazepine derivatives.
Graphite oxide: a metal free highly efficient carbocatalyst for the synthesis of 1,5-benzodiazepines under room temperature and solvent free heating conditions
作者:Ramen Jamatia、Ajay Gupta、Binoyargha Dam、Mithu Saha、Amarta Kumar Pal
DOI:10.1039/c6gc03110b
日期:——
We report a sustainable and metal free carbocatalyst, graphite oxide, for the synthesis of 1,5-benzodiazepines underroomtemperature and solventfree heating conditions.
Abstract 1,5‐Benzothiazepines and 1,5‐benzodiazepines have been synthesized in solvent‐free conditions from chalcones and o‐aminothiophenol or o‐phenylenediamine in the presence of inorganic support. Silica gel was found to be an effective support for the synthesis of 1,5‐benzothiazepines, whereas alumina was effective for the synthesis of 1,5‐benzodiazepines.
Benzodiazepines (BZDs) represent a class of privilege scaffold in the modern era of medicinal chemistry as CNSactiveagents and BZD based drugs are used to treat different psychotic disorders. Inspired from the therapeutic potential of BZDs as promising CNSactiveagents, in the present work three different series of 1,5-benzodiazepines bearing various substitutions at position 2 and 4 of the benzodiazepine