Abstract
1,8-Diazabicyclo[5.4.0]-undec-7-en-8-ium acetate, a basic ionic liquid, showed excellent catalytic activity in the three-component condensation reaction of aldehydes and malononitrile with α- or β-naphthol or 4-hydroxycoumarin. The products, amino-4H-chromenes and dihyropyrano[c]chromenes respectively, were obtained under mild conditions without any additional organic solvents in good to excellent yields and short reaction times. The catalyst could be recycled several times with only slight loss of activity.
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