CeO2 has been used as heterogeneous catalyst for carbon‐carbon bond formation via cross‐dehydrogenative coupling (CDC). It works efficiently for oxidative C−C bond formation between N‐aryltetrahydroisoquinoline derivatives and a carbon nucleophile nitroalkane and acetone under aerobic conditions. This is the first report of CeO2 as a low temperature catalyst for the carbon‐carbon bond formation reaction between two sp3 C−H bonds.

A synthetic strategy for pyrrolo[3,4-c]quinoline-1,3-diones via oxidative annulation followed by DDQ mediated dehydrogenation and N-demethylation.

A Pd­(II)-catalyzed oxidative annulation reaction of 4-hydroxycoumarin and arylcarboxylic acid via double C–H bond activations has been accomplished for the synthesis of bis-coumarins. This synthetic strategy provides a wide range of structurally diversified bis-coumarins in moderate to good yields with a variety of functional group compatibility. Moreover, photophysical properties of synthesized bis-coumarins have been evaluated, which reveals their interesting fluorescent properties.