Synthesis of 2,5-anhydro-(β-d-glucopyranosyluronate)- and (α-l-idopyranosyluronate)-d-mannitol hexa-O-sulfonate hepta sodium salt
作者:János Kuszmann、Gábor Medgyes、Sándor Boros
DOI:10.1016/j.carres.2004.03.006
日期:2004.6
hexa-O-sulfate. Glycosidation of the same acceptor with the α-thiophenylglycoside of methyl 2,4-di-O-acetyl-3-O-benzyl- l -idopyranosyl uronate in the presence of NIS/TfOH afforded the corresponding 3-O-α-glycoside in very low yield, therefore the α-thiophenylglycoside of 2-O-acetyl-2,4-O-benzylidene-3-O-benzyl- l -idopyranose was used as donor. The terminal hydroxymethyl group of the obtained disaccharide was
摘要2,5,5-脱水-1,6-二-O-苯甲酰基-d-甘露糖醇与(2,3,4-三-O-乙酰基-α-d-吡喃葡萄糖基-1-O-三氯乙亚氨酸酯)尿酸糖苷的糖基化在三氟甲磺酸三甲基甲硅烷基酯的存在下提供相应的3-O-β-糖苷,将其脱保护后,用DMF·SO3转化为其六-O-硫酸盐,用乙酸钠处理后得到,随后用氢氧化钠将甲酯皂化2,5-脱水-3-O-(β-d-吡喃葡萄糖基尿酸)-d-甘露醇六-O-硫酸盐的七钠盐。在NIS / TfOH存在下,用2,4-二-O-乙酰基-3-O-苄基-1-尿吡喃葡萄糖基尿酸甲酯的α-硫代苯基糖苷对同一受体的糖基化得到相应的3-O-α-糖苷。产率很低,因此2-O-乙酰基2的α-硫代苯基糖苷 使用4-O-亚苄基-3-O-苄基-1-吡喃糖作为供体。随后将所获得的二糖的末端羟甲基基团用NaOCl / TEMPO氧化,并将所获得的艾杜糖醛酸衍生物转化为2,5-脱水-3-O-(-α-1