反应详情

A mixture of 6 ml of water, 8 gm of amalgamated zinc, 14 ml of concentrated hydrochloric acid, 20 ml of toluene and 4 gm of 4-(4'-amino-3'-bromo-4-biphenylyl)-4-oxo-butyric acid was refluxed for 6 hours, while stirring. Subsequently, 10 ml of dioxane were added and the toluene/dioxane phase was separated. The residue remaining after evaporation of the solvent was admixed with water, covered with ether, and adjusted with sodium bicarbonate solution to pH 6. The ether solution was separated, washed with water, dried over sodium sulfate and evaporated. The thus obtained 4-(4'-amino-3'-bromo-4-biphenylyl)-butyric acid was dissolved in ethyl acetate and converted into its cyclohexylamine salt by addition of cyclohexylamine. Yield: 25% of theory. Melting point of the cyclohexylamine salt: 182° C. (decomp.).

1. temperaturewas refluxed for 6 hours
2. customthe toluene/dioxane phase was separated
3. customafter evaporation of the solvent
4. customThe ether solution was separated
5. washwashed with water
6. dry with materialdried over sodium sulfate
7. customevaporated
8. dissolutionThe thus obtained 4-(4'-amino-3'-bromo-4-biphenylyl)-butyric acid was dissolved in ethyl acetate
9. additionconverted into its cyclohexylamine salt by addition of cyclohexylamine