antitumor activity in mice. Also, the active imidazo[4,5-b]pyridine 3 was shown to cause the accumulation of cells at mitosis. Routes were developed for the synthesis of congeners of 3 by cyclization of 4-(substituted amino)-5,6-diaminopyridines with ethyl orthoformate. Oxidative cyclization of either 4,5- or 5,6-diaminopyridines with aryl aldehydes produced the [4,5-c] and [4,5-b] imidazopyridine ring systems
1,2-
二氢吡啶并[3,4-b]
吡嗪(1)是在小鼠中具有显着抗肿瘤活性的有丝分裂
抑制剂。同样,活性
咪唑并[4,5-b]
吡啶3被显示导致有丝分裂时细胞的积累。通过用原
甲酸乙酯环化4-(取代的
氨基)-5,6-二
氨基吡啶,合成了3的同类物。4,5-或5,6-二
氨基吡啶与芳基醛的氧化环化分别产生了[4,5-c]和[4,5-b]
咪唑并
吡啶环系统。后者与6-(取代的
氨基)-4,5-二
氨基吡啶的反应得到
咪唑并[4,5-c]
吡啶环类似物。1。
生物学研究表明,目标化合物的活性低于1和3。