A pseudo-1,4'- N-linked disaccharide, pseudoacarviosin 5, was constructed via a key palladium-catalyzed coupling reaction of pseudoglycosyl chloride 8 (prepared from d-glucose via a novel direct intramolecular aldol addition in 12 steps) and pseudo-4-amino-4,6-dideoxy-alpha- d-glucose 9 (prepared from l-arabinose via an unusual trans-fused isoxazolidine-selective intramolecular nitrone-alkene cycloaddition
伪1,4'-N-连接的二糖伪拟紫薇香素5是通过
钯在关键的
钯催化的拟糖基
氯8的偶联反应(由d-
葡萄糖通过12步新颖的直接分子内羟醛加成反应制得的)和拟糖基
氯构成的。 4-
氨基-4,6-二脱氧-α-d-
葡萄糖9(由A-
阿拉伯糖通过不寻常的反式融合的
异恶唑烷选择性分子内氮烯-烯烃环加成反应制备而成,共11步)。伪
胡萝卜素5已被证明是α-
葡糖苷酶的有效
抑制剂,尤其是与血糖控制有关的肠粘膜酶
蔗糖酶和
葡糖淀粉酶。