焦碳酸二乙酯 、
3-amino-7-nitro-5-trifluoromethyl-indazole-2-carboxylic acid ethyl ester 以
乙醇 为溶剂,
反应 0.5h,
以Analogously to Example 1, 0.1 mol of 3-amino-5-trifluoromethyl-7-nitroindazole and 150 ml of pyrocarbonic acid diethyl ester in 100 ml of ethanol give 3-amino-5-trifluoromethyl-7-nitro indazole-2-carboxylic acid ethyl ester (melting point: 186°-187° C; 74% of theory) in 30 minutes at 80° C.的产率得到7-nitro-5-trifluoromethyl-1(2)
H-indazol-3-ylamine