Substitution of the amino group of 2-amino-3H-1, 4-benzodiazepines such as 1 and 2 with primary amines and hydroxylamines was investigated and the 2-substituted compounds 3-19, 21 and 37 were synthesized as shown in Table I. In the case of the reaction with hydroxylamine, however, a 2-aminomethylquinazoline 3-oxide (20) was obtained from a 2-amino-and a 2-methylamino-benzodiazepines (1 and 3) in addition to 2-hydroxyamino-1, 4-benzodiazepine (21). This data show that ring opening at the N-4 : C-5 double bond occurred. A similar ring opening in a 2-methylamino-1, 4-benzodiazepine 4-oxide (4) furnished a quinazoline-2-carboxaldehyde oxime 3-oxide (40). The derivatives of 21 and its oxide (37) were prepared as exemplified by the synthesis of oxadiazolo [4, 3-a] [1, 4]-benzodiazepines (25 and 39).
对2-
氨基-3H-1,4-苯二氮杂烯类化合物(如1和2)
氨基取代为初级胺和
羟胺的反应进行了研究,并合成了2-取代化合物3-19、21和37,如表I所示。然而,在与
羟胺反应的情况下,除了得到2-羟
氨基-1,4-苯二氮杂烯(21)外,还从2-
氨基和2-甲基
氨基苯二氮杂烯(1和3)获得了2-
氨基甲基
喹唑啉3-氧化物(20)。这些数据表明,在N-4 : C-5双键处发生了环打开。在2-甲基
氨基-1,4-苯二氮杂烯4-氧化物(4)中出现了类似的环打开,产生了
喹唑啉-2-甲醛
肟3-氧化物(40)。衍
生物21及其氧化物(37)以合成噁二唑[4,3-a][1,4]-苯二氮杂烯(25和39)为例进行了制备。