title: Novel one-pot three- and pseudo-five-component reactions: synthesis of functionalized benzo[g]- and dihydropyrano[2,3-g]chromene derivatives.
abstract: A novel and efficient method has been developed for the synthesis of highly functionalized benzo[g]- and dihydropyrano[2,3-g]chromene derivatives via addition and subsequently cyclization of 2-hydroxynaphthalene-1,4-dione or 2,5-dihydroxycyclohexa-2,5-diene-1,4-dione to the condensation product of an aldehyde with malononitrile in the presence of a catalytic amount of Et(3)N in CH(3)CN at ambient temperature. The procedures are very facile. The products can be obtained with simple filtration in high yields, and no more purification is needed. These compounds are closely related to ring systems such as beta-lapachone, alpha-xiloidone, lambertellin, pyranokunthone B, and WS-5995A, which have a broad spectrum of biological activities.
authors.affiliation: Department of Chemistry, Shahid Beheshti University, P.O. Box 19396-4716, Tehran, Iran. a-shaabani@cc.sbu.ac.ir
authors.forename: Ahmad
authors.initials: A
authors.lastname: Shaabani
authors.forename: Rahim
authors.initials: R
authors.lastname: Ghadari
authors.forename: Sabrieh
authors.initials: S
authors.lastname: Ghasemi
authors.forename: Milad
authors.initials: M
authors.lastname: Pedarpour
authors.forename: Ali Hossein
authors.initials: AH
authors.lastname: Rezayan
authors.forename: Afshin
authors.initials: A
authors.lastname: Sarvary
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng
mesh_terms: D001578:Benzopyrans / Q000138:chemical synthesis* / Q000737:chemistry; D020650:Combinatorial Chemistry Techniques / Q000379:methods*; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D015394:Molecular Structure; D011809:Quinones / Q000138:chemical synthesis* / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D001578:Benzopyrans; D011809:Quinones