We developed an indirect synthetic method for α-L-fucosides. Based on the fact that L-fucose is 6-deoxy-L-galactose, our strategy consists of the stereoselective construction of α-L-galactoside and its conversion to α-L-fucoside via C6-deoxygenation. The formation of α-L-galactoside is strongly directed using 4,6-O-di-tert-butylsilylene(DTBS)-protected L-galactosyl donors. The DTBS-directed α-L-galactosylation
我们开发了一种α-
L-岩藻糖苷的间接合成方法。基于
L-岩藻糖为6-脱氧-L-半
乳糖的事实,我们的策略包括立体选择性地构建α- L-半
乳糖苷并通过C6-脱氧将其转化为α -
L-岩藻糖苷。α-形成大号半
乳糖苷是使用4,6-强烈定向ø -二-叔-butylsilylene(DTBS)保护的大号半
乳糖供体。DTBS定向的α- L-半
乳糖基化显示出广泛的底物适用性,以及出色的偶联收率和α-选择性。在α- L的C6-脱氧中-半
乳糖苷,Barton-McCombie反应促进了向
L-岩藻糖苷的高产率转化。为了证明我们方法的适用性,我们合成了天然存在的α-
L-岩藻糖苷。