重氮甲烷 、
2,5,5,8,11,13-Hexamethyl-10,12-dioxo-9-(1,3-dimethyl-2,4,6-trioxo-hexahydropyrimidinyl)-1,2,3,4-tetrahydro-5H-(2)-benzopyrano<3,4-h>(1)-benzopyrano<2,3-d>-10,11,12,13-tetrahydropyrimidin 以
乙醚 为溶剂,
以83%的产率得到2,5,5,8,11,13-Hexamethyl-10,12-dioxo-9-(1,3-dimethyl-6-methoxy-2,4-dioxo-perhydropyrimidinyl)-1,2,3,4-tetrahydro-5H-(2)-benzopyrano<3,4-h>(1)-benzopyrano<2,3-b>-10,11,12,13-tetrahydropyrimidin