Synthesis of 4-substituted phenyl 2,5-anhydro-1,6-dithio-α- -gluco- and -α- -guloseptanosides possessing antithrombotic activity
作者:Éva Bozó、Adél Medgyes、Sándor Boros、János Kuszmann
DOI:10.1016/s0008-6215(00)00156-7
日期:2000.10
d -glucoseptanose 13. When 12 or 13 were used as donors and trimethylsilyl triflate as promoter for the glycosylation of 4-cyanobenzenethiol, a mixture of 4-cyanophenyl 3,4-di-O-acetyl-2,5-anhydro-1,6-dithio-α- l -gulo- (58) and -α- d -glucoseptanoside (61) was formed suggesting an isomerisation of the heteroallylic system of the intermediate. A similar mixture of 58 and 61 resulted when 18 was treated
摘要研究了两种独立的方法来合成3,4-二-O-乙酰基-1,6:2,5-二脱水-1-硫代-d-葡萄糖醇(18),这是合成1的关键中间体, 3,4-三-O-乙酰基-2,5-脱水-6-硫代-α-d-葡糖庚糖(13),需要作为糖基供体。在第一种方法中,将1,6-二溴-1,6-二脱氧-d-甘露醇用作起始原料,并通过2,5-脱水-1,6-二溴-1,6-二脱氧-4-O-进行转化。将甲磺酰基-3-O-四氢吡喃基-d-葡萄糖醇转化为18。第二种方法从1,2:5,6-二-O-异亚丙基-d-甘露醇和烯丙基,4-甲氧基苄基以及甲氧基乙氧基甲基分别用于保护3,4-OH基团。所得中间体通过其1,2:5,6-二脱水衍生物转化为相应的3,4-O-保护的2,5-脱水-6-溴-6-脱氧-d-葡萄糖醇衍生物。通过将溴与硫代乙酸酯交换,通过甲磺酸化活化OH-1并用甲醇钠处理这些酯,将1,6-硫代脱水基桥引入这些化合物中。在这些方