Selective One-pot Synthesis of Flavan Derivatives in Hidden Brønsted acid Catalysis
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An efficient synthesis of functionalized flavans from commercially available phenols and easily available aryl allene derivatives is reported, which are important skeletons in biological and pharmaceutical fields. The synthesis involves a brønsted acid catalyzed intermolecular hydroarylation and intramolecular hydroalkoxylation reactions. This one-pot synthesis showed a high regioselectivity in both hydroarylation reacting at the terminal position of allenes and hydroalkoxylation forming 6-membered furan derivatives via 6-endo mode.