Diels-Alder Reactions of Masked o-Benzoquinones with Electron-rich Dienophiles. Highly Regio- and Stereoselective Synthesis of Bicyclo [2.2.2]octenone Derivatives - Gao, Shih-Yu; Lin, Yen-Lin; Dharma Rao, Polisetti; Liao, Chun-Chen (Synlett, 2000)