The 1,3-dipolar cycloaddition of a five-membered cyclic nitrone derived from malic acid (4) and unsaturated D-threo-hexaldonolactone (1) leads to a single adduct 6, which can be transformed into the 8-homocastanospermine (13) via a sequence involving rearrangement of the six-membered lactone ring into the five-membered one, removal of the terminal carbon atom from the sugar chain, cleavage of the NO bond, and the intramolecular alkylation of the nitrogen atom. The iminosugar (13) does not show any interesting inhibitory activity towards α- and β-glucosidases.Key words: iminosugars, homocastanospermine, nitrones, aldono-1,5-lactone, 1,3-dipolar cycloaddition, glucosidases.
由苹果酸衍生的五元环腈酮(4)与不饱和 D-三-己醛内酯(1)进行 1,3-二极环加成反应会产生单一加合物 6,通过将六元内酯环重新排列为五元环、从糖链中移除末端碳原子、裂解 NO 键以及氮原子的分子内烷基化等一系列过程,该加合物可转化为 8-高杂木香苷(13)。亚氨基糖(13)对α-和β-葡萄糖苷酶没有显示出任何有趣的抑制活性。