all-beta-(1----6)-linked methyl galactotetraoside 13, having O-6(4) free, followed by debenzoylation of the formed, fully protected methyl galactoheptaoside. The blockwise synthesis of the nucleophile 13 from readily available monosaccharides, and the synthesis of 5 from the corresponding beta-1-O-benzoylated trisaccharide, is also described. Heptasaccharide 10 binds with the (1----6)-beta-D-galactan-specific monoclonal
合成七糖,β-D-Galp-(1 ---- 3)-β-D-Galp-(1 ---- 6)-β-D-Galp-(1 ---- 6的结合β-D-Galp-(1 ---- 6)-β-D-Galp-1-OCH3(10)与X24
基因家族的两个单克隆IgAs进行了研究。通过
三氟甲磺酸银介导的O-(2,3,4,6-四-O-苯甲酰基-β-D-
吡喃半
乳糖基)-(1-3)-O-(2,4)的偶联合成
配体10 ,6,-t-ri-O-苯甲酰基-β-D-
吡喃半
乳糖基)-(1 ---- 3)-2,4,6-三-O-苯甲酰基-α-D-
吡喃半
乳糖基
氯(5)苯甲酰化的,全β-(1–6)连接的甲基半
乳糖四糖苷13,不含O-6(4),然后对形成的,完全保护的甲基半
乳糖庚糖苷进行脱苯甲酰化。还描述了由容易获得的
单糖的亲核试剂13的嵌段合成,以及由相应的β-1-O-苯甲酰化三糖的5的合成。七糖10与(1 ---- 6)-β-
D-半乳聚