反应详情

The ester was hydrolyzed as follows: Ethyl 2-chloro-6-(2-cyclopropylethynyl)pyridine-3-carboxylate (0.7 g, 2.8 mmol) and lithium hydroxide (0.4 g, 16.86 mmol) were refluxed in a mixture of 30 mL MeOH and 10 mL water. The mixture was cooled and the methanol was removed in vacuo. The remaining solution was acidified to pH 2 with 1M HCl at 0° C. The precipitate was filtered and dried to give 0.4 g (57%) of the title compound. m/z=222.4 (M+1).

1. temperatureThe mixture was cooled
2. customthe methanol was removed in vacuo
3. customwas acidified to pH 2 with 1M HCl at 0° C
4. filtrationThe precipitate was filtered
5. customdried