3-amino-5-trifluoromethyl-7-ethoxycarbonylaminoindazole-2-carboxylic acid ethyl ester 以
焦碳酸二乙酯 为溶剂,
反应 0.33h,
以Analogously to Example 1, 0.1 mol of 3,7-diamino-5-trifluoromethylindazole in 70 ml of pyrocarbonic acid diethyl ester gives 3-amino-5-trifluoromethyl-7-ethoxycarbonylaminoindazole-2-carboxylic acid ethyl ester (melting point: 229°-230° C; 89% of theory) in 20 minutes at 70° C.的产率得到3,7-diamino-5-trifluoromethylindazole