Direct construction of xanthene and benzophenone derivatives via Brønsted acid controlled Diels-Alder reaction of 3-vinylchromones and arynes

A Brønsted acid controlled Diels-Alder reaction of 3-vinylchromones with arynes has been developed. By employing different kinds and amounts of acid, 9-aryl-9H-xanthen-9-ols or ortho-hydroxybenzophenones could be controllably furnished in good yields in an atom- and step-economic manner.

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