A Brønsted acid‐mediated formal [3+3] cascade annulation of propargylic alcohols with 1,3‐diketones proceeds through a sequential Meyer−Schuster rearrangement/1,2‐addition. This protocol, which has a wide scope and is conducted under an ambient atmosphere, enables access to a broad array of valuable chromenone derivatives related to many natural products in satisfactory yields under mild conditions. This method could be scaled up to the gram scale, which highlights the latent applicability of this transformation.

中文翻译：

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丙酸与1,3-二酮之间的布朗斯台德酸介导的正式[3 + 3]环

布朗斯台德酸介导的带有1,3-二酮的炔丙醇的正式[3 + 3]级联环化反应通过顺序的Meyer-Schuster重排/ 1,2-加成进行。该方案具有广泛的适用范围，并且在环境气氛下进行，可以在温和的条件下以令人满意的产率获得与许多天然产物有关的有价值的色酮衍生物。该方法可以按比例缩放至克级，这突出了此转换的潜在适用性。