3‘-C-Branched LNA-Type Nucleosides Locked in an N-Type Furanose Ring Conformation: Synthesis, Incorporation into Oligodeoxynucleotides, and Hybridization Studies
作者:Michael Meldgaard、Flemming Gundorph Hansen、Jesper Wengel
DOI:10.1021/jo049159a
日期:2004.9.1
protected 3‘-C-branched LNA-type phosphoramidite building blocks 17, 27, and 38, containing furanose rings locked in an N-type conformation, were synthesized from a known 3-C-allyl allofuranose derivative using strategies relying on the introduction of the branching alkyl chain before condensation with the nucleobase. Synthesis of 3‘-C-hydroxypropyl derivatives proved superior to synthesis of the 3‘-C-hydroxyethyl
三保护的3'-C-支LNA型亚磷酰胺构建模块17,27,和38,将含有锁定在N型构象呋喃糖环,从一个已知的3-合成Ç -烯丙基allofuranose衍生物使用的策略依赖于引入与核碱基缩合之前的支链烷基链的结构。3'-合成Ç羟丙基衍生物证明优于3'-合成Ç羟乙基衍生物,和前被转化成相应的3'- Ç氨丙基衍生物。亚磷酰胺27和38随后将其应用于自动化DNA合成仪,从而将3个3'-C支链的LNA型单体X,Y和Z引入寡聚脱氧核苷酸,并研究了它们对杂交性能的影响。相对于3' - C-羟丙基-LNA单体X,观察到引入3' - C-氨基丙基-LNA单体Y的双链稳定作用,尤其是在低盐条件下。这表明单体Y的伯氨基在所应用的杂交条件下,α-β是质子化的,并且该带正电荷的基团在主沟中的定位具有显着的双链体稳定作用。单体Y通过柱上共轭法通过甘氨酰单元进一步官能化而得到单体Z,该单体Z显示出比单体Y更小的稳定作用。