ethyl 3-amino-5-methoxy-1-(4-methoxyphenyl)-10-methyl-8-oxo-1,8-dihydropyrano[3,2-f]chromene-2-carboxylate 、 formamide 反应 6.0h,
以70%的产率得到9-Methoxy-18-(4-methoxyphenyl)-3-methyl-6,11-dioxa-13,15-diazatetracyclo[8.8.0.02,7.012,17]octadeca-1,3,7,9,12(17),13-hexaene-5,16-dione