作者:Dieter Enders、Irene Breuer、Eugen Drosdow
DOI:10.1055/s-2005-918439
日期:——
3-dioxan-5-one the title nucleosides were synthesised in 14 steps employing the SAMP-/RAMP-hydrazone methodology. The dioxanone-SAMP-hydrazone was first transformed into a trisubstituted derivative by a triple α-/α′-alkylation. Removal of the chiral auxiliary and subsequent reduction gave the corresponding alcohol, which could be transformed over four steps into TBS-protected 2′-C-methyl-5′-deoxy-l-lyxose
报道了 4'-epi-trachycladines A 和 B 的首次不对称合成。从 2,2-二甲基-1,3-dioxan-5-one 开始,使用 SAMP-/RAMP-腙方法分 14 个步骤合成标题核苷。二恶烷酮-SAMP-腙首先通过三重α-/α'-烷基化转化为三取代衍生物。去除手性助剂并随后还原得到相应的醇,该醇可以通过四个步骤转化为 TBS 保护的 2'-C-甲基-5'-脱氧-l-来苏糖。然后使用标准 Vorbruggen 和甲硅烷基-Hilbert-Johnson 条件通过相应的三乙酸酯以 18-21% 的总产率获得 trachycladines。这种2'-C-分支核糖核苷是腺苷受体的潜在激动剂,在药物发现中发挥重要作用。