反应详情

A mixture of N-(1-benzylpiperid-4-yl)-2-hydroxy-4-acetamido-5-nitrobenzamide (1 g; 0.0024 moles) [prepared as described in Example 2], sodium hydroxide (0.2 g; 0.0048 moles), water (25 ml) and ethanol (12.5 ml) was boiled under reflux for 3 hours. Then the mixture was diluted with water, neutralized with diluted hydrochloric acid and the precipitate collected by filtration. This precipitate was washed with water and then with diethyl ether to give 0.9 g of N-(1-benzylpiperid-4-yl)-2-hydroxy-4-amino-5-nitrobenzamide. This compound was treated with a saturated solution of hydrogen chloride in methanol to give the hydrochloride which was recrystallized from ethanol. N-(1-Benzylpiperid-4-yl)-2-hydroxy-4-amino-5-nitrobenzamide hydrochloride was obtained, m.p. 248°-250° C. (dec).

1. temperatureunder reflux for 3 hours
2. filtrationthe precipitate collected by filtration
3. washThis precipitate was washed with water