Brønsted acid promoted one-pot synthesis of 4-aryl-3,4-dihydrocoumarins

4-Aryl-3,4-dihydrocoumarins are a class of valuable molecules demonstrating attractive pharmaceutical and biological properties. In this paper, we designed a new and facile approach to synthesis of 4-aryl-3,4-dihydrocoumarin derivatives by Brønsted acid catalyzed Friedel-Crafts alkylation and cycloaddition reaction. With this protocol, 15 examples of 4-aryl-3,4-dihydrocoumarins were successfully prepared with yields ranging from 82 to 99%.

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