The preparation of polyhydroxylated 6-oxa-nor-tropane glycomimetics structurally related to the glycosidase inhibitor family of the calystegines is reported. The synthetic strategy involves the furanose→piperidine rearrangement of 5-deoxy-5-ureido-l-idose precursors, followed by intramolecular glycosylation involving the primary hydroxyl group. Inversion of the configuration at C-3 in the resulting
据报道,在结构上与calystegines的糖苷酶
抑制剂家族有关的多羟基化6-氧杂-正-托烷烷糖模拟物的制备。合成策略涉及5-脱氧-5-
脲基-1-ID糖前体的
呋喃糖→
哌啶重排,然后涉及伯羟基的分子内糖基化。所得6-氧杂-(+)-calystegine B 2类似物在C-3处的构型反转允许进入难以捉摸的3 - epi -6-氧杂-(+)-calystegine B 2骨架。然而,观察到
正二十烷的酸催化的开环,可以通过小心地中和反应混合物来避免。抑制结果表明(+)-calystegine B 2 衍
生物和相应的C-3差向异构体可以分别看作是糖模拟物和半拟模拟物,指向该
生物碱家族的1-氮杂糖作用方式。