title: Efficient synthesis of benzopyrans and dihydropyranochromenes catalyzed by poly(4-vinylpyridine) as a green and commercially available basic catalyst.
abstract: Poly(4-vinylpyridine) is used as a green, commercially available and recyclable basic catalyst for the multicomponent synthesis of benzopyrans and dihydropyranochromenes by one-pot condensation of aromatic aldehydes, 3-methyl-1-phenyl-2-pyrazolin-5-one, and malononitrile or 4-hydroxycoumarin in ethanol at reflux temperature. This procedure provides several advantages such as mild reaction conditions, short reaction times, simple work-up and high yields.
authors.forename: Jalal
authors.initials: J
authors.lastname: Albadi
authors.forename: Azam
authors.initials: A
authors.lastname: Mansournezhad
authors.forename: Fatemeh Akbari
authors.initials: FA
authors.lastname: Balout-Bangan