Method for the site specific synthesis of novel 3-hydroxypyridin-4(1H)ons derivatives from aminomonosaccharides or aminoitols, products obtained by this method and their applications
申请人:Instituto Biochimico Pavese Pharma S.p.A.
公开号:US06177409B1
公开(公告)日:2001-01-23
Process for regiospecific preparation of new 3-hydroxypyridine-4(1H)-one derivatives starting from monosaccharides or itols of general formula:
in which R represents a radical, either saturated or not, branched or not, having carbon-atom groups, and having hetero-atoms or not, and Sub represents a saccharide derivative or an itol, either cyclic not, protected or not, the hydrocarbon skeleton of which is bound to the nitrogen atom of the pyridinone either directly or by the intermediary of a spacing group. The present invention is characterized in that the process comprises a first step of protection of the 3-hydroxy group of the pyranone derivative, a second basocatalyzed step of substitution of the intracyclic oxygen atom of the pyranone by the nitrogen atom of the amine function of the amino monosaccharide or amino itol, and a third step of de-protection of the 3-OH group of the pyridinone cycle and possibly of the OH groups of the glucide or itol residue. It also regards the products obtained by this process, as well as their applications, namely as medicaments for the treatment of toxic overloads of FeIII.
从单糖或itol出发制备新的3-羟基吡啶-4(1H)-酮衍生物的区域特异性制备方法的过程,其通式为:其中R代表一个基团,饱和或不饱和,分支或不分支,具有碳原子基团,有或没有杂原子,而Sub代表糖衍生物或itol,无论是环状还是非环状,受保护或未受保护,其烃骨架通过间隔基直接或间接地与吡啶酮的氮原子结合。本发明的特点在于,该过程包括第一步保护吡喃酮衍生物的3-羟基,第二步碱性催化替换吡喃酮内环氧原子为氨基单糖或氨基itol的氮原子,第三步去保护吡啶酮环的3-OH基团和可能的葡萄糖苷或itol残基的OH基团。本发明还涉及通过该过程获得的产物,以及它们的应用,即作为治疗FeIII毒性过载的药物。