Novel synthesis of pyrido[1,2-<i>a</i>]benzimidazoles<i>via</i>reaction of<i>N</i>-acyl arylhydroxylamines with pyridine
作者:David J. Anderson、Arlen J. Taylor
DOI:10.1002/jhet.5570230426
日期:1986.7
was acetylated to the mono-N-acetyl and bis-acetyl derivatives 10 and 11 which reacted with pyridine to afford the pyrido[1,2-a]benzimidazole 13. An analoguous series of reactions was executed with 4-chloro-3,5-dinitrobenzotrifluoride to afford the pyrido[1,2-a]benzimidazole 21. Structure confirmation of 21 was established via an x-ray determination. The mechanism of the transformation is discussed.
通过催化氢化和/或三氯化钛还原4-氯-3,5-二硝基苯甲腈可生成三个连续的羟胺6,7和8,这些胺在完全还原成二胺9时得到充分表征。硝基羟胺6被乙酰化为单胺-N-乙酰基和双乙酰基衍生物10和11与吡啶反应,得到吡啶基[1,2- a ]苯并咪唑13。用4-氯-3,5-二硝基苯并三氟化物进行一系列类似的反应,得到吡啶并[1,2- a ]苯并咪唑21。的结构的确认21成立通过X射线确定。讨论了转换的机制。