A versatile synthesis of αGalCer and its analogues exploiting a cyclic carbonate as phytosphingosine 3,4-diol protecting group
作者:Luigi Panza、Federica Compostella、Daniela Imperio
DOI:10.1016/j.carres.2018.11.005
日期:2019.1
analogues by using a handily protected phytosphingosine is reported here. The conversion of the phytosphingosine amino group to azide and the protection of 3,4-diol as cyclic carbonate group, cleavable in mild basic conditions but resistant to acidic treatment, afforded quickly an excellent glycosyl acceptor. Its glycosylation with a proper galactosyl donor, gave a versatile intermediate in high yield
本文报道了通过使用人工保护的植物鞘氨醇对αGalCer和一些相关类似物的便捷合成策略。将植物鞘氨醇氨基转化为叠氮化物并保护3,4-二醇为环状碳酸酯基(可在温和的碱性条件下裂解但耐酸性处理)迅速提供了出色的糖基受体。其与适当的半乳糖基供体的糖基化作用以高收率和优异的立体选择性提供了通用中间体。为了证明该中间体的潜力,选择了三种与免疫学相关的化合物作为模型靶标:αGalCer,丹磺酰基α-半乳糖基神经酰胺和7DW8-5。这些产品只需几个步骤就可以轻松获得,并且产率很高,可以验证合成路线。