entry to the chiral bicyclo[5.3.0]decane skeletons relevant to sesqui- and higher terpenoids has been achieved. Its usefulness was demonstrated by formal synthesis of a guaiane sesquiterpenoid (-)-englerin A. The key reactions are (i) diastereoselective Nazarov cyclization for stereoselective construction of the bicyclo[5.3.0]decane skeleton, (ii) intramolecular C-H amination for tuning an oxidation state
已经实现了与
倍半萜和更高
萜类化合物有关的手性
双环[5.3.0]癸烷骨架的发散入口。
愈创树
倍半萜(-)-englerin A的正式合成证明了其有用性。关键反应是(i)非对映选择性Nazarov环化,用于
双环[5.3.0]癸烷骨架的立体选择性构建,(ii)分子内CH胺化,用于调节氧化态,和(iii)将烷基引入具有
锌(II)盐配合物的β-烷氧基酮中。