Dihydroquinazolino[3,2-<i>a</i>][1,5]benzodiazepines: Synthesis and Computational Study of Reductive N-Heterocyclization of<i>N</i>-(2-Nitrobenzoyl)-1,5-benzodiazepin-2-ones
作者:Regina Janciene、Gema Mikulskiene、Tomas Javorskis、Ausra Vektariene、Gytis Vektaris、Lidija Kosychova
DOI:10.1002/jhet.2038
日期:2015.1
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
利用易于获得的5-酰基-1,3,4,5-四氢键耦合制备了许多6,7-二氢喹唑啉代[3,2- a ] [1,5]苯并二氮杂-3-13 (5 H)-酮。 -2 H -1,5-苯并二氮杂-2-酮与2-硝基苯甲酰氯的混合物,然后进行还原性N杂环化。3-甲基取代的1-(2-硝基苯甲酰基)-1,5-苯并二氮杂酮衍生物在还原性N-杂环化条件下不环化。讨论了这种杂环化的可能机理,并证明羟胺中间体是该反应的引发剂。为了阐明各种1,5-苯并二氮杂pine衍生物不同反应性的原因,对羟胺中间体的量子化学反应性描述子进行了计算和评估。