Cu/Pd-Catalyzed Tandem Carbonylative Synthesis of Ester-Containing 3,4-Dihydroquinolin-2(1H)-one Derivatives from Alkyne-Tethered α-Bromocarbonyls.

A Cu/Pd-catalyzed tandem radical cyclization and carbonylation of alkyne-tethered α-bromocarbonyls with phenols has been developed for the expedited construction of ester-containing 3,4-dihydroquinolin-2(1H)-one scaffolds. By employing benzene-1,3,5-triyl triformate (TFBen) as the CO source, the reaction proceeded smoothly to afford a series of ester-containing 3,4-dihydroquinolin-2(1H)-one derivatives in high yields. Moreover, this method could be utilized in the late-stage modifications of bioactive molecules.