[F:1][C:2]([F:16])([F:15])[O:3][C:4]1[CH:9]=[CH:8][C:7]([CH:10]=[CH:11][C:12](O)=[O:13])=[CH:6][CH:5]=1.C(Cl)(=O)C(Cl)=O.[NH3:23]>O1CCCC1.CN(C)C=O>[F:1][C:2]([F:16])([F:15])[O:3][C:4]1[CH:9]=[CH:8][C:7]([CH:10]=[CH:11][C:12]([NH2:23])=[O:13])=[CH:6][CH:5]=1To a suspension of 4.90 g (21.1 mmol) 3-(4-Trifluoromethoxy-phenyl)-acrylic acid in 30.0 ml tetrahydrofuran and 0.3 ml N,N-dimethyl formamide a solution of 2.70 ml (32.0 mmol) oxalyl chloride in 5.0 ml tetrahydrofuran was added dropwise at 0° C. within 10 min. Stirring was continued at 0-5° C. for 30 min. and 2 h at room temperature thereafter. The resulting solution was cooled to 0-5° C. again and then added within 15 min. to 75 ml of a 25% aqueous ammonia solution. After stirring for 30 min. the precipitated amide was collected, washed with water and dried at 40° C. in vacuo. 4.48 g (92%) 3-(4-Trifluoromethoxy-phenyl)-acrylamide.
Wird geladen…
