Pd-Catalyzed Alkyne and Aryne Annulations: Synthesis and Photophysical Properties of pi-Extended Coumarins

A Pd-catalyzed alkyne and aryne annulation strategy via C-H activation has been implemented for the synthesis of pi-extended coumarins. This synthetic strategy provides a wide range of pi-extended coumarins in moderate to good yields with good functional group compatibility. Photophysical properties of the synthesized pi-extended coumarins have been evaluated, and some of them show interesting fluorescent properties. Three of the synthesized coumarins have been unambiguously established by a single-crystal XRD study.

Automated summary

A Pd-catalyzed alkyne and aryne annulation strategy via C-H activation has been successfully used for the synthesis of pi-extended coumarins. This strategy provides a wide range of pi-extended coumarins with good functional group compatibility and moderate to good yields. The photophysical properties of the synthesized pi-extended coumarins have been evaluated, showing interesting fluorescent properties.