First Diels-Alder Reactions of 3-Styrylchromones under Microwave Irradiation - Pinto, Diana C G A; Silva, Artur M S; Almeida, Lúcia M P M; Carrillo, José R; Díaz-Ortiz, Angel; de la Hoz, António; Cavaleiro, José A S (Synlett, 2003)