描述了一种新颖的核糖型环己烯基核苷类的直接方法。电子需求的Diels-Alder反应形成了所选合成途径的关键步骤。尽管差异很小,但使用NMR进行的构象分析表明,该核苷类似物优先采用2 H 3构象(S型),而“脱氧”环己烯基类似物优先选择C3'内构象(N型)。构象平衡的分析表明,在给定的实验条件下,腺苷与其环己烯基同源物之间的差异在于它们的不同ΔG价值观 此外,在腺苷中,构象偏好是焓起源的,而在环己烯基同源物中,构象偏好是熵的起源的。
描述了一种新颖的核糖型环己烯基核苷类的直接方法。电子需求的Diels-Alder反应形成了所选合成途径的关键步骤。尽管差异很小,但使用NMR进行的构象分析表明,该核苷类似物优先采用2 H 3构象(S型),而“脱氧”环己烯基类似物优先选择C3'内构象(N型)。构象平衡的分析表明,在给定的实验条件下,腺苷与其环己烯基同源物之间的差异在于它们的不同ΔG价值观 此外,在腺苷中,构象偏好是焓起源的,而在环己烯基同源物中,构象偏好是熵的起源的。
The present invention relates to the use of modified nucleotides and single or double stranded oligonucleotides having at least one of said modified nucleotides for performing RNA interference. The modified nucleotides are selected from 6-membered ring containing nucleotides such as hexitol, altritol, O-substituted or O-alkylated altritol, cyclohexenyl, ribo-cyclohexenyl and O-substituted or O-alkylated ribo-cyclohexenyl nucleotides. The present invention also relates to novel modified nucleosides or nucleotides and to the use of the novel modified nucleosides and nucleotides in single or double stranded oligonucleotides for RNA interference, antisense therapy or other applications.
Synthesis and Conformational Analysis of a Ribo-Type Cyclohexenyl Nucleoside
作者:Sara Vijgen、Koen Nauwelaerts、Jing Wang、Arthur Van Aerschot、Irene Lagoja、Piet Herdewijn
DOI:10.1021/jo048037f
日期:2005.6.1
straightforward approach to a novel class of ribo-type cyclohexenylnucleosides is described. An electron-demand Diels−Alder reaction forms the key-step of the chosen synthetic pathway. Although the difference is small, conformational analysis using NMR shows that this nucleoside analogue adopts preferentially an 2H3 conformation (S-type), while the “deoxy” cyclohexenyl analogue has a preference for a C3‘ endo conformation
描述了一种新颖的核糖型环己烯基核苷类的直接方法。电子需求的Diels-Alder反应形成了所选合成途径的关键步骤。尽管差异很小,但使用NMR进行的构象分析表明,该核苷类似物优先采用2 H 3构象(S型),而“脱氧”环己烯基类似物优先选择C3'内构象(N型)。构象平衡的分析表明,在给定的实验条件下,腺苷与其环己烯基同源物之间的差异在于它们的不同ΔG价值观 此外,在腺苷中,构象偏好是焓起源的,而在环己烯基同源物中,构象偏好是熵的起源的。