申请人:Valeant Pharmaceuticals International
公开号:US06743902B1
公开(公告)日:2004-06-01
A number of modified nucleosides are disclosed composed of modified sugar moieties which contain substituents at C1 and C4 positions, or branched substituents at C3 and C5 positions of deoxyribose or ribose. Each nucleoside is converted to or properly protected and then converted to the corresponding phosphoramidites. These phosphoramidites are used to assemble oligonucleotides in which there is at least one of the forenoted nucleosides. These sugar modified oligonucleotides have the potential to be used as antisense therapies since they are expected to enhance nuclease resistance and cellular uptake while they maintain sequence-specificity and affinity to nucleic acid targets in vitro or in vivo.
本文披露了一些修饰过的核苷酸,由修饰过的糖基组成,其中包含在脱氧核糖或核糖的C1和C4位置,或在C3和C5位置有支链取代基。每个核苷酸都被转化或适当保护,然后转化为相应的磷酰胺酯。这些磷酰胺酯用于组装寡核苷酸,在其中至少有一个上述核苷酸。这些糖修饰的寡核苷酸具有成为反义疗法的潜力,因为预计它们将增强核酸酶的抵抗力和细胞摄取能力,同时在体外或体内保持序列特异性和亲和力与核酸靶标。