title: Site-Selective Diels-Alder Reactions of 7-(Methoxyimino)-4-methylchromene-2,8-dione with Alkenes.
abstract: Regio- and site-selective Diels-Alder reactions of o-quinone monooxime 1 are reported. The electron rich dienophiles 2, 4, 6, 8, and 10 react with the exocyclic diene system of monooxime 1 leading to the coumarin derivatives 3, 5, 7, 9, 11, and 12. The electron deficient dienophiles 13a,b and 18 react with the quinoid and the pyrone diene systems of compound 1 affording the cycloadducts 14a,b, 17a,b, and 19.
authors.affiliation: National Research Center of Physical Sciences "Demokritos", 15310, Aghia Paraskevi, Attiki, Greece.
authors.forename: D. N.
authors.initials: DN
authors.lastname: Nicolaides
authors.forename: C.
authors.initials: C
authors.lastname: Bezergiannidou-Balouctsi
authors.forename: R. Wajih
authors.initials: RW
authors.lastname: Awad
authors.forename: K. E.
authors.initials: KE
authors.lastname: Litinas
authors.forename: E.
authors.initials: E
authors.lastname: Malamidou-Xenikaki
authors.forename: A.
authors.initials: A
authors.lastname: Terzis
authors.forename: C. P.
authors.initials: CP
authors.lastname: Raptopoulou