Synthesis and biological activity of 3-substituted imidazo[1,2-a]pyridines as antiulcer agents
作者:John E. Starrett、Thomas A. Montzka、Alfred R. Crosswell、Robert L. Cavanagh
DOI:10.1021/jm00129a028
日期:1989.9
New imidazo[1,2-a]pyridines substituted at the 3-position have been synthesized as potential antisecretory and cytoprotective antiulcer agents. The synthetic routes began with cyclization of aminopyridines 5a,b and chloro ketones 6a,b to give imidazo[1,2-a]pyridines 7-9. The side chain at the 3-position was elaborated to give primary amines 12a-c, which were treated with either butoxyaminocyclobutenedione
已经合成了在3位上取代的新咪唑并[1,2-a]吡啶,作为潜在的抗分泌和细胞保护性抗溃疡药。合成途径开始于氨基吡啶5a,b和氯酮6a,b的环化,得到咪唑并[1,2-a]吡啶7-9。精制3-位的侧链,得到伯胺12a-c,分别用丁氧基氨基环丁二酮13或甲氧基氨基噻二唑1-氧化物(15)处理,分别得到14a,b和16a-c。在两步法中将噻二唑1-氧化物16a-c转化为噻二唑19a-c,该过程包括在16a-c中挤出亚砜,得到二亚胺化物17a-c,随后将其用硫代双邻苯二甲酰亚胺(18)处理。这些化合物在胃瘘大鼠模型中均未显示出明显的抗分泌活性,但是有几个在EtOH和HCl模型中均显示出良好的细胞保护特性。8-(苄氧基)-3- [1-[[2-[(4-氨基-1,2,5-噻二唑-3-基)氨基]乙基]硫代]乙基] -2-甲基咪唑[1,2- a]吡啶(19c)具有与SCH-28080(4)相当的细胞保护活性。