title: Use of 4-cyanocoumarins as dienophiles in a facile synthesis of highly substituted dibenzopyranones.
abstract: A new synthesis of dibenzopyranones 14 is reported via the Diels-Alder cycloaddition of 4-cyanocoumarins 12 with 1-silyloxydienes 10 to give the adducts 13 which are then converted into 14 in one step via treatment with base and loss of the cyano and silyloxy groups.
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA.
authors.forename: Michael E
authors.initials: ME
authors.lastname: Jung
authors.forename: Damian A
authors.initials: DA
authors.lastname: Allen
mesh_terms: D000475:Alkenes / Q000737:chemistry; D001578:Benzopyrans / Q000138:chemical synthesis* / Q000737:chemistry; D003374:Coumarins / Q000737:chemistry*; D003500:Cyclization; D015394:Molecular Structure
chemical_list: D000475:Alkenes; D001578:Benzopyrans; D003374:Coumarins