反应详情

Alternatively, the 2-fluoro-4-aminophenylpropiolic acid is prepared from 2-fluoro-4-nitrocinnamic acid by successive treatment with bromine in acetic acid, aqueous sodium hydroxide, ferric sulfate and ammonium hydroxide, and ethanolic hydrogen chloride. The propiolic acid is then converted to the corresponding ethyl ester and alkylated with 1-bromohexadecane in the manner of Example 9. The resulting ethyl 2-fluoro-4-(hexadecylamino)phenylpropiolate is hydrolyzed in the manner of Example 10 to yield 2-fluoro-4-(hexadecylamino)phenylpropiolic acid.