3-Bromoaniline → 2-(3-Bromophenylamino)-4-chloro-5-nitrothiazole

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Reaction Steps

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-(3bromophenylamino)-4-chloro-5-nitrothiazole of melting point 191° C. to 192° C. (decomposition) are thus obtained.

Provenance & Evidence