Chemical synthesis of a hexasaccharide comprising the Lewisx determinant linked β-(1 → 6) to a linear trimannosyl core and the precursor pentasaccharide lacking fucose
作者:Rakesh K. Jain、Khushi L. Matta
DOI:10.1016/0008-6215(95)00376-2
日期:1996.2
D-mannopyranosyl)-(1-->6)-2,3,4-tri-O-benzyl- alpha-D- mannopyranoside (12) in the presence of NIS-triflic acid to give, after removal of the chloroacetyl group, the key intermediate, benzyl O-(2,3,4-tri-O-acetyl-alpha-D-mannopyranosyl)-(1-->6)-O-(2,3,4-tri-O-ben zyl- beta-D-mannopyranosyl)-(1-->6)-2,3,4-tri-O-benzyl-alpha-D-mannopyranosid e (14). A similar condensation of 6 and 7 with acceptor 14
将苯基2,3,4-三-O-乙酰基-6-O-氯乙酰基-1-硫代-α,β-甘露吡喃糖苷(5)与苄基O-(2,3,4-三-O-苄基- β-D-甘露吡喃糖基)-(1-> 6)-2,3,4-三-O-苄基-α-D-甘露吡喃糖苷(12)在NIS-三氟甲磺酸存在下除去氯乙酰基,关键中间体,苄基O-(2,3,4-三-O-乙酰基-α-D-甘露吡喃糖基)-(1-> 6)-O-(2,3,4-三-O -苯甲酰基-β-D-甘露吡喃糖基)-(1→6)-2,3,4-三-O-苄基-α-D-甘露吡喃糖苷e(14)。6和7与受体14的类似缩合,然后除去保护基,分别得到16和18。预期这些化合物可用于针对我们目前正在研究的相关合成抗原的抗体的特异性研究。