Face‐Selective and <i>endo</i>‐Selective Cycloadditions with Enantiomerically Pure Cyclopentadienes

Abstract

Abstract A general synthetic route to the enantiopure bicyclic cyclopentadienes ( S )‐ 3 and ( R )‐ 3 of the hydrindane series, starting from the Hajos‐Wiechert ketone 4 or its enantiomer is described. Reasons for the excellent face and endo selectivity of cycloadditions and the resulting consequences for chiral recognition are discussed.