A family of novel carbasugar analogues (bicyclitols) based on cis-hydrindane and cis-decalin frameworks has been conceptualized. These novel entities can be regarded as conduritol and carbasugar hybrids. Syntheses of these polyhydroxylated entities have been achieved in stereo- and regioselective manners, starting from the readily available DielsAlder adducts of 5,5-dimethoxy-1,2,3,4-tetrachlorocyclopentadiene and appropriate dienophiles like cyclopentadiene or p-benzoquinone, that embody a masked 7-ketonorbornenone moiety. Thermally induced chelotropic elimination of CO from the appropriately functionalized 7-ketonorbornenone derivatives to deliver annulated bicyclic 1,3-cyclohexadiene derivatives was the key step in this synthetic endeavor. Further oxy-functionalization of the 1,3-cyclohexadiene moiety delivered the targeted polycyclitols. A preliminary investigation of the glycosidase inhibitory potency of these bicyclitols, identified compounds 18 and 54 as potent and selective inhibitors of α-glucosidase (yeast).Key words: carbasugar, conduritol, glycomimics, glycosidase inhibitors.
一系列基于顺式-
水合甘
氨酸和顺式-
癸烷骨架的新型碳
糖类似物(双
环醇)已被构想出来。这些新型实体可以被视为康杜糖和碳糖的混合体。这些多羟基实体的合成已经以立体选择性和区域选择性的方式实现,从易得的
5,5-二甲氧基-1,2,3,4-四氯环戊二烯的Diels-Alder加合物开始,以及类似
环戊二烯或对苯二醌的适当双烯作为二烯体,这些二烯体包含一个掩蔽的7-酮诺邦酮基团。从适当官能化的7-酮诺邦酮衍
生物中通过热诱导的螯合消除CO来提供环化双环
1,3-环己二烯衍
生物是这一合成努力的关键步骤。进一步对
1,3-环己二烯基团进行氧功能化,形成目标多
环醇。对这些双
环醇的糖苷酶抑制活性进行初步研究,鉴定出化合物18和54作为α-
葡萄糖苷酶(酵母)的有效和选择性
抑制剂。关键词:碳糖,康杜糖,
糖类似物,糖苷酶
抑制剂。