Structural requirements for hybridization at the 5′-position are different in α-l-LNA as compared to β-d-LNA
作者:Punit P. Seth、Charles R. Allerson、Michael E. Østergaard、Eric E. Swayze
DOI:10.1016/j.bmcl.2011.11.012
日期:2012.1
The synthesis and biophysical evaluation of R and S-5′-Me-α-l-LNA nucleoside phosphoramidites and modified oligo-2′-deoxyribonucleotides is reported. Synthesis of the nucleoside phosphoramidites was accomplished in multi-gram quantities starting from diacetone glucose. The 5′-methyl group in the S configuration was introduced by reacting the sugar 5′-aldehyde with MeMgBr. Synthesis of the R-5′-Me isomer
报道了R和S -5' -Me-α- 1 - LNA核苷亚磷酰胺和修饰的oligo-2'-脱氧核糖核苷酸的合成和生物物理评价。从双丙酮葡萄糖开始,以克数计完成核苷亚磷酰胺的合成。通过使糖5'-醛与MeMgBr反应,引入S构型的5'-甲基。R -5'-Me异构体的合成是通过使用Mitsunobu条件从S -5'-Me核苷通过后期转化完成的。在热变性实验中对修饰寡核苷酸的评估表明,R -5'-Me-α- 1-LNA显示出与α- 1- LNA相似的RNA亲和力,而S -5' -Me类似物的稳定性较差。该结果与β- d系列相反,在β- d系列中,S -5' -Me异构体对RNA表现出LNA样的亲和力,而R -5'-Me基团完全逆转了对双链热稳定性的稳定作用。