Organocatalytic Asymmetric Synthesis of 3,3‐Disubstituted 3,4‐Dihydro‐2‐quinolones

The first organocatalytic asymmetric reaction employing 3,4‐dihydro‐2‐quinolone has been developed leading to the synthesis of biologically important 3,3‐disubstituted‐dihydro‐2‐quinolones. Cinchona alkaloid derived bifunctional amino‐thiourea catalysts were found to be the best catalysts. The products were obtained in high enantio‐ and good diastereoselectivities and also few synthetic transformations have been demonstrated.