Silica sulfuric acid as a mild and efficient reagent for the synthesis of 1,4-Diazepine and 1,5-Benzodiazepine derivatives
The synthesis of biologically active 1H-1,4-diazepines 4a-d and 3H-1,5-benzodiazepines 5a-d in good yields, from the heterocyclization reaction of 2-(4-methylthio benzenesulfonyl)-1,3-dimethyl/1-methyl-3-phenyl/1,3-diphenyl/ 1-methyl-3- ethoxy propane-1,3