The glucose-, mannose-, and galactose-derived spirocyclic cyclopropylammonium chlorides 1a–1d, 2a–2d and 3a–3d were prepared as potential glycosidase inhibitors. Cyclopropanation of the diazirine 5 with ethyl acrylate led in 71% yield to a 4 : 5 : 1 : 20 mixture of the ethyl cyclopropanecarboxylates 7a–7d, while the Cu-catalysed cycloaddition of ethyl diazoacetate to the exo-glycal 6 afforded 7a–7d
准备了
葡萄糖,
甘露糖和半
乳糖衍生的螺环
氯化环丙基
氯化铵1a - 1d,2a - 2d和3a - 3d作为潜在的糖苷酶
抑制剂。所述吖丙因
环丙烷5与
丙烯酸乙酯,71%收率导致了4:5:1:
乙基环丙烷羧酸酯的20混合物7A - 7D,而
铜催化的重
氮基
乙酸乙酯的环加成到外-glycal 6,得到图7a - 7D(6:2:5:3)的产率为93-98%(方案1)。皂化,Curtius降解以及随后添加BnOH或t- BuOH分别导致Z-或Boc-
氨基甲酸酯11a - 11d和12a - 12d的总收率达到60-80%。对11a - 11d进行
氢解可得到1a - 1d,而在N -Boc基团进行酸性裂解之前,将12a - 12d
脱苄基化为13a - 13d。的甘露-和半
乳糖异构体2A - 2D和3A - 3D分别以相似的产率相似地获得(方案2和4)。还制备了差动保护的
甘露聚糖配置的
酯24a - 24d ;