Electron Deficient Dienes 3: Rapid Access to 2-Hydroxybenzophenones via Inverse Electron Demand Diels-Alder-Driven Domino Reactions of a Chromone-Fused Electron Deficient Diene with Enamines - Bodwell, Graham J; Hawco, Krista M; da Silva, Robin P (Synlett, 2003)