An efficient preparative procedure is described, leading from β-allyl C-glycosides of d-ribofuranose to alcohols by a hydroboration-oxidation procedure. The corresponding aldehydes were obtained by Swern or Dess-Martin oxidation. Alternatively, two of the alcohols were mesylated to gain access to azides and amines. Treatment of the aldehydes with ethynylmagnesium bromide or phenylethynyllithium and consecutive oxidation of the diastereomeric alcohols provided the acetylenic ketones in good to excellent yields. The obtained derivatives serve as important intermediates for the synthesis of various heterocyclic systems.
本研究介绍了一种高效的制备方法,通过氢
硼氧化法将 d-ribofuranose 的δ-烯丙基 C-糖苷转化为醇。通过 Swern 或 Dess-Martin 氧化反应可得到相应的醛。此外,还可对其中两种醇进行甲磺酰化,以获得
叠氮化物和胺。用
乙炔溴化镁或
苯乙炔锂处理
醛类,并连续氧化非对映醇,可得到
乙炔酮,收率从良好到极佳。获得的衍
生物是合成各种杂环系统的重要中间体。