申请人:ICN Pharmaceuticals, Inc.
公开号:US04138547A1
公开(公告)日:1979-02-06
1-.beta.-D-Ribofuranosyl-1,2,4-triazole-3-carboxamide is prepared by a process wherein a suitably substituted formimidic acid hydrazide is condensed with a blocked derivative of D-ribose and the intermediate is ring closed with a reagent which donates one carbon atom to yield a 3-substituted-1-(blocked .beta.-D-ribofuranosyl)-1,2,4-triazole. Treatment of this intermediate with ammonia and/or removal of the blocking group yields the product.
1-.beta.-D-Ribofuranosyl-1,2,4-triazole-3-carboxamide是通过以下过程制备的:将适当取代的甲酰胺肼与D-核糖的阻断衍生物缩合,中间体经过环合反应,其中一个碳原子由试剂提供,形成3-取代-1-(阻断的β-D-核糖呋喃基)-1,2,4-三唑。将该中间体与氨和/或去除阻断基即可得到产物。