Pd(II)-Catalyzed Oxidative Naphthylation of 2-Pyridone through N–H/C–H Activation Using Diarylacetylene as an Uncommon Arylating Agent
Satabdi Bera, Aniruddha Biswas, Juthi Pal, Lisa Roy, Supriya Mondal, Rajarshi Samanta
Abstract
A Pd(II)-catalyzed straightforward oxidative naphthylation of unmasked 2-pyridone derivatives is described using a twofold internal alkyne as a coupling partner. The reaction proceeds through N–H/C–H activation to provide polyarylated N -naphthyl 2-pyridones. An unusual oxidative annulation at the arene C–H bond of the diarylalkyne leads to the formation of polyarylated N -naphthyl 2-pyridones, where the 2-pyridone-attached phenyl ring of the naphthyl ring is polyaryl-substituted. Mechanistic studies and DFT calculations suggest a plausible mechanism based on N–H/C–H activation. The N -naphthyl 2-pyridone derivatives were studied to explore encouraging photophysical properties.