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3-Acetylcoumarine and a series a coumarin-chalcone hybrid compounds have been synthesized in good- to-excellent yields using a simple and efficient method. This method involved the one-pot reaction of salicylaldehyde, an α-ketoester to afford 3-acetylcoumarine and the product has been treated with an aromatic aldehyde using L-proline as a bioorganic catalyst to yield 1-(3-coumarinyl)-3-aryl-2-propen-1-one (3-cinnamoylcoumarins).

CONDENSATION REACTION BETWEEN 3-ACETYLCOUMARINE AND ARYL ALDEHYDES IN THE PRESENCE OF L-PROLINE