Asymmetric Synthesis of 3,4-Dihydroquinolin-2-ones via a Stereoselective Palladium-Catalyzed Decarboxylative [4+2]-Cycloaddition

An efficient, palladium-catalyzed, decarboxylative [4 + 2]-cycloaddition of 4-vinyl benzoxazinanones with carboxylic acids has been developed with the employment of P-chiral mono phosphorus ligand BI-DIME, affording a series of structurally diverse 3,4-dihydroquinolin-2-ones bearing two contiguous stereogenic centers in moderate to good yields with good to excellent stereoselectivities.