Imidazo[1,2-α]pyridine anthelmintics. Synthesis of 6-phenylaminoimidazo[1,2-α]pyridine-2-carbamate and 5-acylaminopyridines by a chapman rearrangement
作者:L. H. Peterson、A. W. Douglas、R. L. Tolman
DOI:10.1002/jhet.5570180402
日期:1981.6
-phenylbenzamido)-2-picoline was prepared by a facile Chapman rearrangement of the corresponding benzimidoyl ester. Oxidation and Curtius rearrangement of the substituted picoline gave 5-(N-phenylbenzamido)-2-aminopyridine which underwent ring closure and debenzoylation to furnish methyl 6-phenylaminoimidazo[1,2-α]pyridine-2-carbamate. Fries rearrangement of the penultimate N-benzoyl derivative gave a 6
由5-羟基-2-甲基吡啶经七个步骤制备标题化合物,为潜在的驱虫剂。中间体5-(N,-苯基苯甲酰胺基)-2-甲基吡啶是通过相应苯甲酰亚胺基酯的简便查普曼重排而制备的。取代的甲基吡啶的氧化和Curtius重排得到5-(N-苯基苯甲酰胺基)-2-氨基吡啶,将其闭环和脱苯甲酰化,得到6-苯基氨基咪唑并[1,2-α]吡啶-2-氨基甲酸甲酯。倒数第二个N-苯甲酰基衍生物的弗里斯重排得到6-(对-苯甲酰基苯基氨基)咪唑并[1,2-α]吡啶衍生物,其结构经cmr研究证实。标题化合物缺乏明显的驱虫活性。