反应详情

A mixture of ethyl 2-benzamido-4-phenylthiazole-5-carboxylate (1.62 g, 4.60 mmol) and lithium hydroxide (0.96 g, 23.00 mmol) was stirred at 50° C. in tetrahydrofuran/water mixture for 96 h. The organic solvent was removed in vacuo and the water layer was washed with ethyl acetate and then acidified by the addition of 15% hydrochloric acid solution to pH 5. The white precipitate obtained was collected by filtration and dried to afford 0.89 g of the title compound in 59% yield; 1H NMR (CDCl3, 300 MHz) δ 13.05 (s, 1H), 8.09 (d, J=7.1 Hz, 2H), 7.80-7.35 (m, 8H); MS (ES+) m/z 325.1 (M+1).

1. customThe organic solvent was removed in vacuo
2. washthe water layer was washed with ethyl acetate
3. additionacidified by the addition of 15% hydrochloric acid solution to pH 5
4. customThe white precipitate obtained
5. filtrationwas collected by filtration
6. customdried