反应详情

2,6-Diamino-nicotinic acid ethyl ester (2.0 g) described in Manufacturing Example 10-2-3 was dissolved in ethanol (15 mL), and a 1N aqueous solution of sodium hydroxide (15 mL) was added thereto, after which the solution was refluxed for 2 hours. The reaction mixture was cooled to room temperature, and the ethanol solvent was evaporated under a reduced pressure. The reaction mixture was neutralized with 1N hydrochloric acid at 0° C. The precipitated solids were filtered off to obtain the titled compound (1.7 g).

1. temperatureafter which the solution was refluxed for 2 hours
2. customthe ethanol solvent was evaporated under a reduced pressure
3. customwas neutralized with 1N hydrochloric acid at 0° C
4. filtrationThe precipitated solids were filtered off