Stereospecific Anionically Promoted Transannular Hydride Shifts in Medium-Ring Hydroxy Ketones. Probe of Their Reversibility and the Potential for Regiocontrol
作者:John E. Hofferberth、Ho Yin Lo、Leo A. Paquette
DOI:10.1021/ol0100733
日期:2001.5.1
Examples are provided of stereospecific transannular oxidation-reduction processes involving the conjugate bases of delta-hydroxy ketones in a nine-membered ring setting. The ability to control the direction of these equilibria by proper modulation of the solvent environment and level of hydroxyl group protection is demonstrated. MM3-derived steric energies of the isomer pairs suggest that the equilibrium