Synthesis and Mechanism of Novel Fluorescent Coumarin—Dihydropyrimidinone Dyads Obtained by the Biginelli Multicomponent Reaction.

A series of 3,4-dihydropyrimidin-2(1H)-one/thione (IV), (VI), (VIII) with high UV absorption and blue fluorescent properties are synthesized from synthetic coumarin β-ketoester derivatives.