Synthesis of three tetrasaccharides containing 3-O-methyl-α-d-mannose, as model compounds for xylose-containing carbohydrate chains from N-glycoproteins
作者:Jos G.M. van der Ven、Jac C.H.M. Wijkmans、Johannis P. Kamerling、Johannes F.G. Vliegenthart
DOI:10.1016/0008-6215(94)80060-x
日期:1994.2
The various methyl beta-D-Manp acceptor derivatives were prepared from the corresponding methyl beta-D-Glcp derivatives via oxidation-reduction. All glycosyl donors were coupled using the trichloroacetimidate method at -40 degrees C in dichloromethane with trimethylsilyl triflate as a catalyst. Methyl-3-O-benzyl-4,6-O-benzylidene-beta-D-mannopyranoside (7) was condensed with 2,3,4-tri-O-acetyl-alpha-D-xylopyranosyl
据报道合成了甲基3,6-二-O-(3-O-甲基-α-D-甘露吡喃糖基)-2-O-β-D-吡喃吡喃糖基-ta-D-甘露吡喃糖苷(2),甲基6 -O-α-D-甘露吡喃糖基-3-O-(3-O-甲基-α-D-甘露吡喃糖基)-2-Ob eta-D-吡喃吡喃糖基-β-D-甘露吡喃糖苷(3)和甲基3-O -α-D-甘露吡喃糖基-6-O-(3-O-甲基-α-D-甘露吡喃糖基)-2-Ob eta-D-吡喃吡喃糖基-β-D-甘露吡喃糖苷(4)。由相应的甲基β-D-Glcp衍生物通过氧化还原制备各种甲基β-D-Manp受体衍生物。使用三氯乙亚氨酸酯方法在二氯甲烷中于-40℃下用三氟甲磺酸三甲基甲硅烷基酯将所有糖基供体偶联。将甲基-3-O-苄基-4,6-O-亚苄基-β-D-甘露吡喃糖苷(7)与2,3,4-三-O-乙酰基-α-D-吡喃戊糖基三氯乙酰亚氨酸酯(8)缩合。在所得的二糖衍生物上进行区域选择性的还原性4,6