焦碳酸二乙酯 、 3-amino-6-trifluoromethyl-indazole-1-carboxylic acid ethyl ester 以
乙醇 为溶剂,
反应 2.0h,
以Analogously to Example 22, 0.04 mol of 3-amino-6-trifluoromethylindazole and 50 ml of pyrocarbonic acid diethyl ester in 25 ml of ethanol give 3-amino-6-trifluoromethylindazole-1-carboxylic acid ethyl ester (melting point: 168°-169° C; 64% of theory) in 2 hours at 80° C.的产率得到3-氨基-6-三氟甲基-1H-吲唑
参考文献:
名称:
3-Aminoindazole-1 and 2-carboxylic acid derivatives
3-Aminoindazole-1 and 2-carboxylic acid derivatives
申请人:Bayer Aktiengesellschaft
公开号:US04051252A1
公开(公告)日:1977-09-27
3-Aminoindazoles bearing a carbo(lower alkoxy), lower alkylamide or di(lower alkyl)amide group in the 1-or 2-position and further being optionally substituted in one or more of the 4-, 5-, 6- and/or 7-positions are analgesic, anti-inflammatory and antipyretic agents. The compounds, of which 3-amino-6-chloroindazole-1-carboxylic acid ethyl ester is a typical embodiment, are prepared through treatment of the appropriate 3-aminoindazole with a derivative of carbonic acid or through thermal isomerization.