Site-Selective Diels-Alder Reactions of 7-(Methoxyimino)-4-methylchromene-2,8-dione with Alkenes.
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.
Nicolaides
D. N.
DN
National Research Center of Physical Sciences "Demokritos", 15310, Aghia Paraskevi, Attiki, Greece.
Bezergiannidou-Balouctsi
C.
C
Awad
R. Wajih
RW
Litinas
K. E.
KE
Malamidou-Xenikaki
E.
E
Terzis
A.
A
Raptopoulou
C. P.
CP