An α-<scp>d</scp>-Configured Bicyclic Nucleoside Restricted in an <i>E</i>-type Conformation: Synthesis and Parallel RNA Recognition
作者:Pawan K. Sharma、Michael Petersen、Poul Nielsen
DOI:10.1021/jo0500380
日期:2005.6.1
oxetane ring. The E-type conformation is confirmed by molecular modeling and NMR. The nucleoside is incorporated into short α-DNA sequences. In a mixed pyrimidine context, these recognize complementary parallel RNA-sequences with mainly increased affinity and complementary parallel DNA-sequences with decreased affinity. The present bicyclic analogue represents the first conformationally restricted α-DNA-analogue
合成了被2'-3'-稠合的氧杂环丁烷环严格限制在E-型构象中的α- d-阿拉伯糖基构型的双环核苷。朝向目标化合物的几种合成策略被描述,并且从成功制备d -木糖衍生物是基于双键的钌-介导的裂解,一个S Ñ 2反转在2-位,得到阿糖-构型,核碱基偶联,最后闭环得到氧杂环丁烷环。该Ë-型构象通过分子建模和NMR确认。核苷被掺入短的α-DNA序列中。在混合的嘧啶环境中,它们识别亲和力主要增加的互补平行RNA序列和亲和力降低的互补平行DNA序列。本双环类似物代表第一个构象受限的α-DNA类似物,以改善与α-DNA单体的混合器中的核酸识别。