6′-Carbon-substituted carbocyclic analogs of 2′-deoxyribonucleosides — Synthesis and effect on DNA/RNA duplex stability
作者:Karl-Heinz Altmann、Rudolf Kesselring、Uwe Pieles
DOI:10.1016/0040-4020(96)00755-7
日期:1996.9
carbocyclic thymidines 11 and 22 have been synthesized via bicyclic lactone 2 and amines 9 and 19, respectively, as key intermediates. Both nucleoside analogs were subsequently elaborated into 5′-O-DMTr protected 3′-phosphoramidites of 6′-α-methyl and 6′-α-hydroxymethyl carbocyclic thymidines as well as appropriately base protected 5-methyl 2′-deoxycytidines. Analysis of the RNA-binding affinity of modified
通过双环内酯2和胺9和19合成了6'-α-甲基和6'-α-羟甲基碳环胸腺嘧啶11和22分别作为关键中间体。随后将两个核苷类似物都精加工成6'-α-甲基和6'-α-羟甲基碳环胸苷的5'-O-DMTr保护的3'-亚磷酰胺以及合适的碱保护的5-甲基2'-脱氧胞苷。结合了这些6'-取代的碳环核苷类似物的修饰寡聚脱氧核糖核苷酸的RNA结合亲和力的分析显示了对DNA / RNA双链体稳定性的强烈位置依赖性。虽然双链体稳定性会通过在分开的序列位置进行点修饰而大大降低,但它仅会受到连续修饰的构建基团的延伸的轻微影响。