Dihydroquinazolino[3,2-a][1,5] benzodiazepines: Synthesis and Computational Study of Reductive N-Heterocyclization of N-(2-Nitrobenzoyl)-1,5-benzodiazepin-2-ones

作者：Janciene Regina^*; Mikulskiene Gema; Javorskis Tomas; Vektariene Ausra; Vektaris Gytis; Kosychova Lidija

来源：Journal of Heterocyclic Chemistry, 2015, 52(1): 243-250.

DOI：10.1002/jhet.2038

A number of 6,7-dihydroquinazolino[3,2-a][1,5]benzodiazepin-13(5H)-ones were prepared utilizing the coupling of readily available 5-acyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-2-ones with 2-nitrobenzoyl chloride followed by a reductive N-heterocyclization. 3-Methylsubstituted 1-(2-nitrobenzoyl)-1,5-benzodiazepinone derivatives did not cyclize under the reductive N-heterocyclization conditions. The possible mechanism of this heterocyclization was discussed, and it was demonstrated that the hydroxylamine intermediate was the initiator of this reaction. To clarify the reasons of different reactivities of various 1,5-benzodiazepine derivatives, the quantum-chemical reactivity descriptors of the hydroxylamine intermediates were calculated and evaluated.

• 出版日期2015-1