4-(5-amino-3-hydroxy-1H-pyrazol-4-ylazo)-N-[2-(saccharin-2-yl)acetyl]benzenesulfonamide 、
ethyl 2-cyano-3-(4-methoxyphenyl)prop-2-enoate 在
哌啶 作用下,
以
1,4-二氧六环 为溶剂,
反应 10.0h,
以73%的产率得到ethyl 7-amino-2-hydroxy-5-phenyl-3-(4-methoxyphenyl)-3-{4-[2-(saccharin-2-yl)acetylsulfamoyl]phenylazo}-4,5-dihydropyrazolo[1,5-a]pyrimidine-6-carboxylate