Journal or Book Title
The Journal of Organic Chemistry
The Diels-Alder reaction has often been used to construct polycyclic quinones from either benzoquinones or naphthoquinones.' This strategy has led to elegant syntheses of certain anthracyclines and also many other acetate-derived compounds. Several researchers, most notably Gesson and Brassard, have determined that the presence of a chlorine or bromine atom on the starting quinone framework permits the ready assemblage of the polycyclic quinone2 (eq 1)
American Chemical Society
Kraus, George A. and Woo, Soon Hyung, "Diels-Alder reactions of quinone sulfoxides" (1986). Chemistry Publications. 719.