A general synthesis of 5,7-diaminoimidazo[4,5-<i>b</i>]pyridine ribosides ("2-amino-1-deazaadenosines") from 5-amino-4-imidazolecarboxamide riboside (AICA riboside)
作者:John E. Francis、Michael A. Moskal
DOI:10.1139/v92-166
日期:1992.5.1
synthesis of 5-substituted 5,7-diaminoimidazo[4,5-b]pyridines from 5-amino-4-imidazolecarboxamide riboside (AICA riboside) was designed to prepare isosteres of substituted 2-aminoadenosines that are selective adenosine A2 receptor agonists. AICA riboside was converted to a hydroxyl-protected 5-amino-4-imidazolecarbonitrile riboside and reacted with an N,N-disubstituted acetamide in the presence of
从 5-氨基-4-咪唑甲酰胺核苷(AICA 核糖苷)合成 5-取代的 5,7-二氨基咪唑并[4,5-b] 吡啶,旨在制备选择性腺苷 A2 受体的取代 2-氨基腺苷的等排体激动剂。AICA 核苷转化为羟基保护的 5-氨基-4-咪唑甲腈核苷,并在磷酰氯存在下与 N,N-二取代乙酰胺反应。氢化钠处理完成了闭环并引入了 7-氨基。在标准条件下除去羟基保护基团。乙酰胺被一个苄基部分的 N-取代通过氢解产生 5-N-取代的衍生物,而 N,N-二苄基乙酰胺产生 5,7-二氨基化合物。从 N,N-二取代丙酰胺获得 6-甲基类似物。