The One-step Synthesis of C,D-dihydropyrano[F] Chromene Derivatives in Under Grinding as An Environmentally Frinendly Alternative

摘要

1,4-diazabicyclo[2.2.2]octane (DABCO) was used as a catalyst for one-pot, three-component condensation reactions consisting of aromatic aldehydes, malononitrile and p-Naphtol under grinding at room temperature, to afford the corresponding dihydropyrano[c]chromenes in high yields. This method has the advantages of a simple operation, mild reaction conditions, high yields, by using a less toxic and low cost chemical as a catalyst.