Oligonucleotides Containing Pyrazolo[3,4-d]Pyrimidines: 8-Aza-7-deazaadenines With Bulky Substituents in the 2- or 7-Position
作者:Frank Seela、Anup M. Jawalekar、Lijuan Sun、Peter Leonard
DOI:10.1080/15257770500265745
日期:2005.9.1
The synthesis of the 2′-deoxyadenosine analogues 1b, 2b, and 3c modified at the 7- and/or 2-position is described. The effect of 7-chloro and 2-methylthio groups on the duplex stability is evaluated. For that, the nucleosides 1b, 2b, and 3c were converted to the corresponding phosphoramidites 15, 19, and 22, which were employed in the solid-phase oligonucleotide synthesis. In oligonucleotide duplexes
描述了在 7-和/或 2-位修饰的 2'-脱氧腺苷类似物 1b、2b 和 3c 的合成。评估了 7-氯和 2-甲硫基对双链稳定性的影响。为此,核苷 1b、2b 和 3c 被转化为相应的亚磷酰胺 15、19 和 22,用于固相寡核苷酸合成。在寡核苷酸双链体中,化合物 1b 与 dT 形成稳定的碱基对,其中分离的 1b-dT 碱基对比连续碱基对的贡献更强。化合物 2b 显示出通用的碱基配对特性,而其 N8 异构体 3c 形成稳定性较低的双链体。