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 β-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.
                                    在室温研磨条件下,以 1,4-二氮杂
双环[2.2.2]辛烷(
DABCO)为催化剂,进行由芳香醛、
丙二腈和 β-
萘酚组成的一锅三组分缩合反应,高产率地制备出相应的二氢
吡喃并[c]色烯。这种方法使用毒性较小、成本较低的
化学品作为催化剂,具有操作简单、反应条件温和、产率高等优点。