对苯二甲醛 、
6-<<(dimethylamino)methylene>amino>-1,3-dimethyluracil 、
邻甲苯胺 以
甲苯 为溶剂,
以78%的产率得到5,6-dihydro-5-(4-(1,2,3,4,5,6-hexahydro-1,3-dimethyl-2,4-dioxo-6-o-tolylpyrimido[4,5-d]pyrimidin-5-yl)phenyl)-1,3-dimethyl-6-o-tolylpyrimido-[4,5-d]pyrimidine-2,4-(1H,3H)-dione