Synthesis of Substituted Coumarins via Bronsted Acid Mediated Condensation of Allenes with Substituted Phenols or Anisoles

[摘要]：Coumarins were obtained from the condensation of electron-rich arenes with allenes in the presence of TfOH in good yield. Depending on the substituent pattern of allenes employed, the general synthetic method of 4-substituted and 3,4-disubstituted 3-arylcoumarins has been developed. Readily available allenes were employed as the three-carbon atom sources constituting the coumarin skeleton.

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