Synthesis of Bridged Inside–Outside Bicyclic Ethers through Oxidative Transannular Cyclization Reactions
作者:Xun Han、Paul E. Floreancig
DOI:10.1021/ol301720u
日期:2012.7.20
The classical geometry of the 6-endo transition state for nucleophilic additions into oxocarbenium ions can be perturbed by incorporating the reactive groups into medium-sized rings, leading to the formation of 2,6-trans-dialkyl tetrahydropyrans. The bicyclic products exhibit inside–outside stereoisomerism, as seen in numerous macrolide natural products.
通过将反应基团结合到中等大小的环中,可以扰乱用于亲核加成到氧代碳鎓离子的 6-内过渡态的经典几何结构,导致形成 2,6-反式-二烷基四氢吡喃。双环产物表现出内外立体异构现象,如许多大环内酯天然产物中所见。