3-amino-4-trifluoromethyl-indazole-1-carboxylic acid ethyl ester 以
焦碳酸二乙酯 为溶剂,
反应 2.0h,
以Analogously to Example 21, 0.06 mol of 3-amino-4-trifluoromethylindazole in 50 ml of pyrocarbonic acid diethyl ester gives 3-amino-4-trifluoromethylindazole-1-carboxylic acid ethyl ester (melting point: 185°-186° C; 68% of theory) in 2 hours at 75° C.的产率得到4-(trifluoromethyl)-1H-indazol-3-amine