A new and efficient protocol to prepare indenes is reported. Assisted by boron trifluoride diethyl etherate, the one-pot reaction of aryl homopropargyl alcohols and aldehydes in the presence of arenes yielded indene derivatives. The reaction was studied with various substrates, which suggests a cascade reaction including a sequence of Prins, Friedel–Crafts, ring-opening reactions, and Friedel–Crafts to form three C–C bonds leading to indenes.

中文翻译：

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BF ₃ ·OEt ₂介导的芳基高炔丙基醇，醛和芳烃的一锅法合成茚的合成

报告了一种新的有效的制备茚的方法。在三氟化硼二乙基醚化物的辅助下，芳基高炔丙醇和醛在芳烃存在下的一锅反应产生了茚衍生物。该反应在各种底物上进行了研究，这表明了级联反应，包括一系列的Prins，Friedel-Crafts，开环反应和Friedel-Crafts，形成三个C-C键，从而导致茚基。