反应详情

A solution of N-[4-methyl-5-(4-nitro-phenyl)-thiazol-2-yl]-acetamide (prepared by the method described in J. Liebscher, E. Mitzner, Synthesis, 1985, (4), p 414) (10 g, 36 mmol) in ethanol (200 ml) and 7M hydrochloric acid (50 ml) is heated at reflux with stirring for 4 hours. After standing at room temperature for 4 days the hydrochloride salt of the title compound (8.15 g) precipitates as yellow crystals which are removed by filtration and dried. The title compound (free base) is obtained by partitioning the hydrochloride salt between aqueous sodium hydroxide and ethyl acetate. The organic extract is separated, dried (MgSO4) and the solvent is removed to give an orange solid (6.58 g). 1N nmr (CDCl3): 2.38 (4H, s, Me), 5.02 (2H, br s, NH2), 7.45 (2H, d), 8.20 (2H, d)

1. temperatureat reflux
2. waitAfter standing at room temperature for 4 days
3. customthe hydrochloride salt of the title compound (8.15 g) precipitates as yellow crystals which
4. customare removed by filtration
5. customdried