申请人:Rikagaku Kenkyusho
公开号:US05476931A1
公开(公告)日:1995-12-19
A process for preparing 3-deoxy-.beta.-D-threo-pentofuransyl nucleosides having the formula (II') shown below: ##STR1## wherein B is a purine, pyrimidine, a protected purine or a protected pyrimidine, and R.sup.4 is a hydroxyl protecting group; comprising treating a compound of formula (I'): ##STR2## wherein B is a purine, a protected purine, a pyrimidine or a protected pyrimidine; R.sup.1 is pivaloyl, tosyl, dimethoxytrityl, benzoyl, or hydroxyl; R.sup.2 is mesyl, triflate, or tosyl; and R.sup.3 is pivaloyl, tosyl, dimethoxytrityl, benzoyl, and hydroxyl with a base--an alkaki metal lower alkoxide, an alkaline earth metal lower alkoxide, sodium hydroxide, or potassium hydroxide--along with a reducing agent--an alkali metal borohydride, an alkaline earth metal borohydride, tetraalkylammonium borohydride in an alcohol solvent at a temperature of from 0.degree. C. to 100.degree. C. for five minutes to two hours. The resulting 3'-deoxy-.beta.-D-threo-pentofuranosyl nucleosides are antiviral.
一种制备具有下式(II')的3-脱氧-β-D-左旋-核糖呋喃基核苷的方法:##STR1##
其中B为嘌呤、嘧啶、受保护的嘌呤或受保护的嘧啶,R.sup.4是羟基保护基;包括用碱-碱金属低级醇盐、碱土金属低级醇盐、氢氧化钠或氢氧化钾以及还原剂-金属硼氢化物、碱土金属硼氢化物、四烷基铵硼氢化物在醇溶剂中处理下式(I')的化合物:##STR2##
其中B为嘌呤、受保护的嘌呤、嘧啶或受保护的嘧啶;R.sup.1为季戊酰、甲苯基、二甲氧基三苯甲基、苯甲酰或羟基;R.sup.2为甲磺酰、三氟甲磺酰或甲苯基磺酰;R.sup.3为季戊酰、甲苯基、二甲氧基三苯甲基、苯甲酰和羟基。反应温度为0℃至100℃,反应时间为5分钟至2小时。所得的3'-脱氧-β-D-左旋-核糖呋喃基核苷具有抗病毒作用。