申请人:Kitagawa Hidetoshi
公开号:US20090286970A1
公开(公告)日:2009-11-19
The present invention relates to a simple, economical method for introducing substituent (I) at the 2′-hydroxyl group of the ribose of a ribonucleic acid derivative whose 3′-hydroxyl group and 5′-hydroxyl group are protected with a silicon protecting group, wherein WG
1
represents an electron-withdrawing group:
The invention also relates to a method for producing a ribonucleic acid derivative of formula (3), comprising the reaction of a ribonucleic acid derivative of formula (1) with a monothioacetal compound of formula (2) to produce the ribonucleic acid derivative of formula (3), using iodine as the reagent for halogenating the sulfur atom of the monothioacetal compound of formula (2) in the presence of an acid:
In formulae (1), (2), and (3), Bz represents a nucleobase which may or may not have a protecting group; WG
1
represents an electron-withdrawing group; R
3
represents alkyl or aryl; and A represents a silicon substituent.
本发明涉及一种简单、经济的方法,用于在核糖核酸衍生物的核糖2'-羟基上引入取代基(I),其中该核糖核酸衍生物的3'-羟基和5'-羟基被硅保护基保护,其中WG1代表一个电子吸引基团。该发明还涉及一种制备式(3)的核糖核酸衍生物的方法,包括将式(1)的核糖核酸衍生物与式(2)的单硫缩醛化合物反应,以产生式(3)的核糖核酸衍生物,使用碘作为卤代单硫缩醛化合物的试剂,在酸的存在下卤代单硫缩醛化合物的硫原子。在式(1)、(2)和(3)中,Bz代表可能具有保护基的核碱基;WG1代表一个电子吸引基团;R3代表烷基或芳基;A代表硅取代基。