The synthesis of two diastereoisomeric pyranopyran sugar amino acids, starting from (+)-D-3,4,6-tri-O-benzylglucal, is described. The key reaction sequence towards the bicyclic structure entails Petasis olefination followed by ring closing metathesis.
描述了从 (+)-D-3,4,6-tri-O-benzylglucal 开始的两种非对映异构
吡喃
吡喃糖
氨基酸的合成。双环结构的关键反应序列需要 Petasis 烯化,然后是闭环复分解。