作者:Alessandra Eleuteri、Colin B. Reese、Quanlai Song
DOI:10.1039/p19960002237
日期:——
acid–dichloromethane (1:9 v/v) at 0 °C and then with zinc in hot acetic acid gives 3′,5′-dithiothymidine 5a and the cyclic disulfide 16, respectively, as crystalline solids in good overall yields. Although attempts to isolate the pure threo-dithio compoun 12b lead to the formation of the cyclic disulfide 16, when the crude material is treated with 2,2-dimethoxypropane in the presence of acid, its 3′,5′-S-isopropylidene
当先在乙醇溶液中用三乙胺加热3',5'-二-O-甲硫基胸苷7然后在N,N-二甲基乙酰胺(DMA)溶液中用4-甲氧基苯基甲硫醇9的钠盐加热时,双(硫化物)11a为高产 当dimesyl酯7与在六甲基磷酰三胺(HMPA)溶液相同的硫醇盐在室温下处理时,苏立体定向获得-双(硫化物)12a。首先在0°C下于乙酸-二氯甲烷(1:9 v / v)中用2-硝基苯亚磺酰氯10处理两个双(硫化物)11a和12a,然后在热乙酸中用锌处理,得到3',5'-二硫代胸腺嘧啶核苷5a和环状二硫化物16分别为结晶固体,总收率良好。尽管尝试分离纯的苏-二硫代化合物12b导致形成环状二硫键16,但在酸存在下用2,2-二甲氧基丙烷处理粗材料时,其3',5'- S-异亚丙基衍生物得到17,并以良好的总产率分离为结晶固体。