A Pd-catalyzed alkyne and aryne annulation strategy via C-H activation has been implemented for the synthesis of πextended coumarins. This synthetic strategy provides a wide range of πextended coumarins in moderate to good yields with good functional group compatibility. Photophysical properties of the synthesized π-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.
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