An expeditious synthesis of 1-epitrehazolamine is presented from readily available 2,3,4,6-tetra-O-benzyl-D-glucose. The key step involves a samarium diiodide-promoted reductive cyclization of a masked keto-nitrone to form a five-membered ring aminocyclitol. The excellent cis selectivity observed in this nitrone–ketone reductive coupling contrasts surprisingly with the trans selectivity of ketone–oxime reductive couplings.
本论文介绍了一种利用现成的 2,3,4,6-四-O-苄基-
D-葡萄糖快速合成 1-表氮杂环胺的方法。其中的关键步骤是在二
碘化钐的促进下,使被掩蔽的酮-氮还原环化,形成五元环
氨基
环醇。在这种硝酮-酮还原偶联中观察到的极佳顺式选择性与酮-
肟还原偶联的反式选择性形成了令人惊讶的对比。