Synthesis of the tetrasaccharide repeating unit of the antigen from Klebsiella type 2
作者:Anup Kumar Misra、Nirmolendu Roy
DOI:10.1016/0008-6215(95)00231-x
日期:1995.11
been synthesized and condensed in the presence of methyl triflate to afford a tetrasaccharide derivative. Removal of protecting groups gave methyl 3-O-(methyl alpha-D-glucopyranosyluronate)-4-O-(3-O-alpha-D- glucopyranosyl-beta-D-glucopyranosyl)-beta-D-mannopyranoside (23), the repeating unit of the antigen from Klebsiella type 2, in the form of its methyl ester methyl glycoside.
二糖乙基2,4,6-三-O-乙酰基-3-O-(2,3,4,6-四-O-苄基-α-D-吡喃葡萄糖基)-1-硫代-β-D-吡喃葡萄糖苷(6)和2,6-二-O-苄基-3-O-(2,3,4-三-O-苄基甲基-α-D-吡喃葡萄糖基尿酸甲酯)-β-D-甘露吡喃糖苷(21)在三氟甲磺酸甲酯的存在下进行合成和缩合,得到四糖衍生物。除去保护基,得到3-O-(甲基α-D-吡喃葡萄糖基尿酸)-4-O-(3-O-α-D-吡喃葡萄糖基-β-D-吡喃葡萄糖基)-β-D-甘露吡喃糖苷(23), 2型克雷伯氏菌抗原的重复单元,以其甲酯甲基糖苷的形式存在。