Iron Tricarbonyl Stabilized Pentadienyl Cation as Initiator for Cascade Polycyclizations: A Diastereoselective Entry into Octahydrophenanthrenes
作者:Anthony J. Pearson、Victor P. Ghidu
DOI:10.1021/jo048557a
日期:2004.12.1
A new example is provided of completely diastereoselective polycyclization, affording the octahydrophenanthrene framework. Generation of an iron tricarbonyl stabilized pentadienyl carbocation is the triggering event of the cascade reaction. The carbocation is generated by anchimerically assisted regiospecific protonation of a double bond adjacent to the iron tricarbonyl diene moiety. Tetrafluoroboric
提供了完全非对映选择性多环化的新例子,提供了八氢菲骨架。三羰基铁稳定的戊二烯碳正离子的生成是级联反应的触发事件。碳正离子是通过与三羰基铁二烯铁相邻的双键的对映体辅助的区域特异性质子化而产生的。四氟硼酸醚络合物似乎是最佳试剂,即使在催化条件下也能提供良好的收率。