Synthesis of 9‐Aryl‐9,10‐dihydrophenanthrenes by Domino [3+3] Annulation/Ring‐Opening/Friedel–Crafts Alkylation Reactions of 1,3‐Bis(trimethylsilyloxy)‐1,3‐butadienes with 3‐Aroyl‐5‐aryl‐4,5‐dihydrofurans

Abstract

The reaction of 1,3‐bis(trimethylsilyloxy)‐1,3‐butadienes with 3‐benzoyl‐5‐aryl‐4,5‐dihydrofurans, available by CAN‐mediated reaction of styrenes with benzoylacetones, afforded functionalized 9,10‐dihydrophenanthrenes. These reactions proceed by a novel domino [3+3] cyclization/ring‐opening/Friedel–Crafts alkylation process.