Novel thioiso pyrimidine and purine nucleosides substituted with exocyclic methylene have been synthesized, starting from D-xylose. Cyclization of the dimesylate to the 4-thiosugar 6a proceeded in pure SN2 reaction in the presence of allylic functional group.
以
D-木糖为原料合成了新的
硫代异
嘧啶和被环外亚甲基取代的
嘌呤核苷。二
甲磺酸酯环化为 4-
硫糖 6a 是在烯丙基官能团存在下在纯 SN2 反应中进行的。