反应详情

Ethyl 2-(4-chloro-2-methoxyphenyl)-4-methylthiazole-5-carboxylate (4.83 g, 15.5 mmol) prepared in the Step 7-1-3 was suspended in ethanol (30 ml), 1 mol/l of sodium hydroxide (30 ml) was added thereto, and the mixture was heated under reflux for 1.5 hours. After being allowed to cool, the mixture was neutralized with hydrobromic acid, then separated by filtration and washed with water. The washed product was subjected to through circulation drying to give the title compound (4.28 g, 97%) as a white powder.

1. temperaturethe mixture was heated
2. temperatureunder reflux for 1.5 hours
3. temperatureto cool
4. customseparated by filtration
5. washwashed with water
6. customdrying