Enantioselective synthesis of dihydroquinazolinone derivatives catalyzed by a chiral organocatalyst

The asymmetric condensation/amine addition cascade sequence of 2-aminobenzamide and aldehydes, catalyzed by a novel chiral organocatalyst, was realized. The organocatalyst was found to be very effective and highly enantioselective for such cascade reactions at room temperature, affording 2,3-dihydroquinazolinones in excellent yields (up to 99%) with enantiomeric excesses of up to 97%. The best level of stereocontrol was obtained for aromatic/aliphatic aldehydes with ortho, para or meta substituents.

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