Studies on the synthesis of rubrolone: 4π participation of O-alkyl α,β-unsaturated oximes in intramolecular [4 + 2] cycloaddition reactions
作者:Dale L. Boger、Yan Zhu
DOI:10.1016/0040-4039(91)80554-j
日期:1991.12
The effective 4-pi participation of O-alkyl alpha,beta-unsaturated oximes, 1-aza-1,3-butadienes, in intramolecular Diels-Alder reactions is described in studies on the synthesis of the rubrolone AB ring system.
Total Synthesis of the Rubrolone Aglycon
作者:Dale L. Boger、Satoshi Ichikawa、Hongjian Jiang
DOI:10.1021/ja002997b
日期:2000.12.1
A totalsynthesis of the rubrolone aglycon is detailed and is based on two key Diels−Alder reactions. The AB ring system incorporating a tetrasubstituted pyridine was assembled, enlisting the rare 4π participation of an O-alkyl α,β-unsaturated oxime in an intramolecular [4 + 2] cycloaddition reaction (70%). The C-ring oxygenated tropolone was introduced through a room-temperature, exo selective [4