反应详情

To a concentrated sulfuric acid (15 ml) is added in portions N-(β-ethoxyacryloyl)-N-(1-benzyl-4-piperidinyl)aniline (1.1 g) at 60° C. After stirring the mixture at the same temperature for 15 minutes, the reaction mixture is poured into ice-water, made alkaline with a 10% aqueous sodium hydroxide solution and extracted with dichloromethane. After the extract is concentrated by distilling off the solvent, the resulting residue is purified by silica gel column chromatography (eluent; dichloromethane:methanol=50:1) and recrystallized from ethyl acetate to give 1-(1-benzyl-4-piperidinyl)carbostyril (0.8 g) as white powders, m.p. 97°-99° C.

1. extractionextracted with dichloromethane
2. concentrationAfter the extract is concentrated
3. distillationby distilling off the solvent
4. customthe resulting residue is purified by silica gel column chromatography (eluent; dichloromethane:methanol=50:1)
5. customrecrystallized from ethyl acetate