5-(4-(dimethylamino)phenyl)-8,8-dimethyl-8,9-dihydro-1H-chromeno[2,3-d]pyrimidine-2,4,6(3H,5H,7H)-trione 、
甲氧苯胺 在
phosphotungstic acid 作用下,
以
乙醇 为溶剂,
反应 6.0h,
以86%的产率得到8,9-dihydro-8,8-dimethyl-5-(4-(N,N-dimethylamino)phenyl)-10-(4-methoxyphenyl)pyrimido[4,5-b]quinoline-2,4,6(1H,3H,5H,7H,10H)-trione