4-(Trifluoromethyl)aniline → alpha-cyano-beta-(4-trifluoromethylanilino)-N-ethoxycarbonylacrylamide

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Reaction Steps

A mixture of α-cyano-β-ethoxy-N-ethoxycarbonylacrylamide (10 g) and 45 ml of ethanol is heated to effect dissolution. Then 8.12 g of p-trifluoromethylaniline in 10 ml of ethanol is added and the mixture heated at reflux for 45 minutes. The mixture is cooled and filtered to give 14.01 g of α-cyano-β-(4-trifluoromethylanilino)-N-ethoxycarbonylacrylamide, which is added to about 60 ml of tetralin and heated at reflux for several hours. On formation of precipitate, the mixture is allowed to cool and then filtered, washed with ether, to yield 5-cyano-1-(4-trifluoromethylphenyl)uracil, m.p. 230.5°-231.5°.

Provenance & Evidence