Synthesis of a Series of Enantiopure Polyhydroxylated Bicyclic N-Heterocycles from an<scp>L</scp>-Erythrose-Derived Nitrone and Alkoxyallenes
作者:Marcin Jasiński、Elena Moreno-Clavijo、Hans-Ulrich Reissig
DOI:10.1002/ejoc.201301406
日期:2014.1
alkoxyallenes and the enantiopure L-erythrose-derived cyclic nitrone (+)-3 were used as precursors for the preparation of novel bicyclic 2H-1,2-oxazine derivatives, which were formed as single diastereomers. A highly stereoselective hydroboration/oxidation sequence provided key substrates that were suitable for the synthesis of a series of polyhydroxylated bicyclic N-heterocycles, including unique
两种不同的锂化烷氧基丙二烯和对映体纯 L-赤藓糖衍生的环硝酮 (+)-3 被用作制备新型双环 2H-1,2-恶嗪衍生物的前体,这些衍生物形成为单一的非对映异构体。高度立体选择性硼氢化/氧化序列提供了适用于合成一系列多羟基化双环 N-杂环的关键底物,包括独特的 5-oxaindolizidines,如 8 和 12。根据安装的保护基团,直接开环/再循环方案允许制备带有两个、三个或四个游离羟基的相应吡咯里西啶。通过颠倒反应步骤的顺序,合成了新型异构的氮杂双环[3.2.0]庚烷衍生物是吡咯里西啶和吲哚里西啶的低级同系物。检查了制备的新型多羟基化合物作为糖苷酶抑制剂的性质,但没有一种化合物显示出值得注意的活性。