反应详情

温度

95 °C

A mixture of 4-(2-ethoxycarbonylethyl)-3-methyl-5-(5-chloro-2-oxo-1,2-dihydroindol-3-ylidenemethyl)-1H-pyrrole-2-carboxylic acid ethyl ester (346 mg) and potassium hydroxide (560 mg) in ethanol (5 mL) was heated to 95° C. and then cooled, upon which red crystals formed. The crystals were dissolved in water and acidified with 2 N hydrochloric acid to pH 2. The precipitate was filtered, washed with water, and dried in a vacuum oven overnight to give 299 mg (100%) of 4-(2-carboxyethyl)-3-methyl-5-(5-chloro-2-oxo-1,2-dihydroindol-3-ylidenemethyl)-1H-pyrrole-2-carboxylic acid as a brown solid.

1. temperaturecooled, upon which red crystals
2. customformed
3. filtrationThe precipitate was filtered
4. washwashed with water
5. customdried in a vacuum oven overnight