Desymmetrization of meso 7-aza-2,3-bis(phenylsulfonyl) bicyclo[2.2.1]hept-2-ene: a re-examination. Kinetic resolution of racemic 3-arylsulfonyl-7-aza-2-bromobicyclo[2.2.1]hepta-2,5-dienes

The desymmetrization and the kinetic resolution of substituted 3-arylsulfonyl-7-azabicyclo[2.2.1]alkenes promoted by (R,R)-hydrobenzoin are described.