1972 年 92 巻 9 号 p. 1170-1173
The Diels-A1der type adduct (II or VI) was formed on the reaction of 2, 3-diphenyl-5, 6-dihydropyrazine (Ia) with diethyl fumarate or with N-methylmaleimide. The stereostructures (IIa and VIa) were proposed from the nuclear magnetic resonance measurements.