Preparation of 5,5-Bis(ethoxycarbonyl)-5,6-dihydro-3,7-diaryl-4<i>H</i>-1,2-diazepines and Their Halogenations
作者:Otohiko Tsuge、Kichinosuke Kamata、Seiichi Yogi
DOI:10.1246/bcsj.50.2153
日期:1977.8
5,5-Bis(ethoxycarbonyl)-5,6-dihydro-3,7-diaryl-4H-1,2-diazepines (4) were prepared by the condensation of α-bromoacetophenone azines with diethyl malonate in the presence of sodium ethoxide. Halogenation of 4 afforded 7,7-bis(ethoxycarbonyl)-2,5-diaryl-3,4-diazanorcaradiene, 4,6-dihalodihydrodiazepines, 1-halodiazanorcaradienes, and/or 4,4,6,6-tetrachlorodihydrodiazepine, whose relative yields depended upon the reaction conditions. Dehalogenation of the halogenated products was also investigated.
5,5-双(乙氧羰基)-5,6-二氢-3,7-二芳基-4H-1,2-二氮杂革(4)通过α-溴苯甲酮腈与二乙基丙二酸酯在乙醇钠存在下的缩合反应制备而成。将4进行卤化处理,得到了7,7-双(乙氧羰基)-2,5-二芳基-3,4-二氮杂诺环二烯、4,6-二卤二氢二氮杂革、1-卤二氮杂诺环二烯和/或4,4,6,6-四氯二氢二氮杂革,其相对产率取决于反应条件。此外,还研究了卤化产物的脱卤反应。