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Substituted 7-methyl-6,7-dihydroquinazolino(3,2- a)((1,5)benzodiazepin-13(5 H)-one derivati- ves were synthesized in a one-step sequential acyla tion-cyclization reaction with a simple procedure from an appropriate 5-substituted 3-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin- 2-one and 2-sulfinylaminobenzoyl chlorides. The mechanism of the heterocyclization reaction was studied by the DFT method using the B3LYP functional and 6-31+G(d, p) basis set.

Novel synthesis of quinazolino[3,2-a][1,5]benzodiazepines: an experimental and computational study