Reversal of regiospecificity in the kinetic vs. thermodynamic enolization of bicyclic ketones. Direct bridgehead functionalization of the bicyclo[5.3.1]undecane ring system
作者:Kenneth J. Shea、Steven T. Sakata
DOI:10.1016/s0040-4039(00)74233-x
日期:1992.7
deprotonation of bicyclo [5.3.1] undecenone 3 gives the more highly substituted bridgehead enolate under conditions of kinetic control while the less highly substituted enolate is formed under conditions of thermodynamic control. These findings allow for the direct bridgeheadfunctionalization of this important bicyclic skeleton.
Bridged to fused ring interchange. New methodology for the construction of fused cycloheptanes and cyclooctanes
作者:S.L. Gwaltney、S.T. Sakata、K.J. Shea
DOI:10.1016/0040-4039(95)01488-4
日期:1995.10
The type two intramolecular Diels-Alder cycloaddition coupled with a bridged to fused interchange provides an efficient method for synthesis of fused 5,7 and 5,8 ring systems.
Bridged to Fused Ring Interchange. Methodology for the Construction of Fused Cycloheptanes and Cyclooctanes. Total Syntheses of Ledol, Ledene, and Compressanolide
作者:S. L. Gwaltney、S. T. Sakata、K. J. Shea
DOI:10.1021/jo961005a
日期:1996.1.1
type two intramolecular Diels-Alder reaction (T2IMDA) is an efficient method for the formation of medium rings. The methodology is particularly effective for the construction of seven- and eight-memberedrings. A strategy for the synthesis of functionalized cycloheptanes and cyclooctanes has been developed that involves a bridged to fused ring interchange. The T2IMDA provides a synthesis for rigid