A Pd-catalyzed alkyne and aryne annulation strategy via C–H activation has been implemented for the synthesis of π-extended coumarins. This synthetic strategy provides a wide range of π-extended 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.

中文翻译：

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Pd 催化的炔烃和芳炔环化：π-扩展香豆素的合成和光物理性质

通过 C-H 活化的 Pd 催化炔烃和芳炔成环策略已用于合成 π-扩展香豆素。这种合成策略以中等至良好的产率提供了多种 π-延伸香豆素，并具有良好的官能团相容性。已对合成的π-延伸香豆素的光物理性质进行了评估，其中一些显示出有趣的荧光性质。通过单晶 XRD 研究明确确定了三种合成的香豆素。