Regio- and Stereoselective Formation of [4+2] Cycloadducts by the Reaction of 7-(Arylamino)-1,3-dimethyl-5,6-dimethylene-5,6-dihydropyrimidine-2,4-(1H,3H)-diones with 8,8-Dicyanoheptafulvene - Ikuno, Ken; Kobayashi, Takashi; Chin, Uchou; Noguchi, Michihiko (Synthesis, 1995)