3-Bromoaniline → 2-(3-Bromophenylamino)-4-chloro-5-nitrothiazole
反応式
[Br:1][C:2]1[CH:3]=[C:4]([CH:6]=[CH:7][CH:8]=1)[NH2:5].Cl[C:10]1[S:11][C:12]([N+:16]([O-:18])=[O:17])=[C:13]([Cl:15])[N:14]=1>CN(C)C=O>[Br:1][C:2]1[CH:3]=[C:4]([NH:5][C:10]2[S:11][C:12]([N+:16]([O-:18])=[O:17])=[C:13]([Cl:15])[N:14]=2)[CH:6]=[CH:7][CH:8]=1参加物
4
実験手順
A solution of 8.6 g (0.05 mol) of 3-bromoaniline in 100 ml of dimethylformamide is added dropwise to a solution of 12.0 g (0.06 mol) of 2,4-dichloro-5-nitrothiazole in 100 ml of dimethylformamide at 0° C. to 5° C. in the course of about 2 hours and the mixture is subsequently stirred at the same temperature for a further 4 hours. It is then stirred into 1,000 ml of ice-water and the precipitate is filtered off, washed with water and dried. To remove excess 2,4-dichloro-5-nitrothiazole, the product is stirred in 80 ml of petroleum ether at room temperature, filtered off, washed with petroleum ether and dried. 16.0 g (95.7% of theory) of 2-(3-bromophenylamino)-4-chloro-5-nitrothiazole of melting point 191° C. to 192° C. (decomposition) are thus obtained.