α-2,3-Unsaturated galactosides were synthesized in good to excellent yields by the initial activation of d-galactals with diethyl phosphorochloridite and the subsequent glycosyl addition via Ferrier rearrangement with various O-nucleophiles in the presence of AlCl3. The two-step reactions were carried out in one-pot and finished within 60 min in 81–95% yield to give the glycoside products with excellent
通过以
二乙基次
氯代
磷酸酯初次激活d-半
乳糖,然后在AlCl 3存在下,通过与各种O-亲核试剂的Ferrier重排加成糖基,以良好至极佳的产率合成了α-2,3-不饱和半
乳糖苷。两步反应在一个反应釜中进行,并在60分钟内完成,收率为81-95%,使糖苷产物具有出色的α-立体选择性。