Cascade Multiple Diels-Alder Reactions of Styrene Derivatives with Maleimide or Maleic Anhydride.

We developed novel one-pot multiple Diels-Alder reactions, which are frequently used in the construction of six-membered rings in functional molecular synthesis. We report triple and double Diels-Alder reactions with styrene derivatives, where the secondary Diels-Alder reaction takes place at a different position from that of the conventional Wagner-Jauregg reaction.