Piperidine analogues of D-galactose as potent inhibitors of α-galactosidase: Synthesis by stannane-mediated hydroxymethylation of 5-azido-1,4-lactones. Structural relationships between D-galactosidase and L-rhamnosidase inhibitors
作者:John P. Shilvock、Robert J. Nash、Alison A. Watson、Ana L. Winters、Terry D. Butters、Raymond A. Dwek、David A. Winkler、George W. J. Fleet
DOI:10.1039/a904145a
日期:——
The syntheses of the polyhydroxylated piperidines deoxygalactonojirimycin 2, homogalactonojirimycins 7 and 9, and other 2,6-iminoheptitol derivatives, including an analogue of L-altropyranose, are reported. 5-Azidoaldono-1,4-lactones undergo chain extension to afford azido lactols by the addition of a hydroxymethyllithium species 18, generated by transmetallation of a protected stannylmethanol derivative 17. Hydrogenation results in azide reduction with subsequent intramolecular reductive amination to give piperidine ring systems. The deprotected iminogalactopyranose analogues are potent and selective α-galactosidase inhibitors. Observations on the structural features determining selectivity of inhibition of α-galactosidases over naringinase (L-rhamnosidase) are also reported.
报告了多羟基哌啶脱氧半乳糖苷尻霉素 2、均半乳糖苷尻霉素 7 和 9 以及其他 2,6-亚氨基庚醇衍生物(包括一种 L-altropyranose类似物)的合成。5-Azidoaldono-1,4-lactones 经历了链延伸,通过添加羟甲基锂 18 得到叠氮内酯,羟甲基锂是由受保护的链烷甲醇衍生物 17 反金属化生成的。氢化反应导致叠氮还原,随后进行分子内还原胺化反应,得到哌啶环系统。去保护的亚氨基半乳糖类似物是强效的选择性δ-半乳糖苷酶抑制剂。报告还观察了决定δ-半乳糖苷酶抑制柚皮苷酶(L-鼠李糖酶)选择性的结构特征。