Polymer-Supported Stereoselective Synthesis of (1<i>S</i>,5<i>S</i>)-6-Oxa-3,8-diazabicyclo[3.2.1]octanes
作者:Eva Schütznerová、Allen G. Oliver、Jaroslav Zajíček、Viktor Krchňák
DOI:10.1002/ejoc.201300093
日期:2013.5
We describe a polymer-supported stereoselective synthesis of the (1S,5S)-6-oxa-3,8-diazabicyclo[3.2.1]octane-bridged scaffold by tandem iminium ion cyclization/nucleophilic addition reactions. A series of resin-bound acyclic intermediates bearing different substituents were prepared, and the scope and limitations of the chemical route leading to the bridged scaffold were evaluated. The Thr-derived
我们描述了聚合物支持的立体选择性合成 (1S,5S)-6-oxa-3,8-二氮杂双环 [3.2.1] 辛烷桥支架,通过串联亚胺离子环化/亲核加成反应。制备了一系列带有不同取代基的树脂结合无环中间体,并评估了导致桥接支架的化学途径的范围和局限性。发现 Thr 衍生的桥接支架在酸中比 Ser 衍生的支架更稳定,后者部分转化为二氢吡嗪酮。在形成亚胺的氮上的取代对酸稳定性至关重要,具有吸电子基团的 N-芳基磺酰胺通过酸介导的裂解产生最高纯度的粗产物。