A VERSATILE REGIO- AND STEREOSPECIFIC ANNULATION METHOD-II. FORMATION OF SUBSTITUTED FIVE- OR SIX-MEMBERED RING SYSTEMS BY ACIDIC FRAGMENTATION OF 1-ETHOXY-2-OXATRICYCLO4,8>NONAN-7-ONE DERIVATIVES

Article abstract of DOI:10.1016/0040-4020(89)80137-1

Smooth fragmentation of the strained title compounds under acidic conditions is achieved.Depending on structure, solvent, Lewis acid and nucleophile stereospecifically substituted cyclopentanones as well as cyclohexanones could be gained in good yields.