反应详情

Into a mixed solution of ethyl 1-methyl-6-(4-methylphenyl)-1H-indole-2-carboxylate (0.7 g) in ethanol/THF (20/10 ml) was added at room temperature a 2 N aqueous solution of sodium hydroxide (1.5 ml), and the resulting mixture was stirred for 24 hours. After addition of 1 N hydrochloric acid (5 ml), the reaction mixture was concentrated under reduced pressure. Water was added to the residue, and the resulting mixture was extracted with ethyl acetate. The organic layer was washed with an aqueous saturated solution of sodium chloride and was dried with magnesium sulfate. After concentration under reduced pressure, the precipitated crystals were collected by filtration. The crystals were washed with hexane to obtain 1-methyl-6-(4-methylphenyl)-1H-indole-2-carboxylic acid (600 mg) as colorless crystals.

1. concentrationthe reaction mixture was concentrated under reduced pressure
2. additionWater was added to the residue
3. extractionthe resulting mixture was extracted with ethyl acetate
4. washThe organic layer was washed with an aqueous saturated solution of sodium chloride
5. dry with materialwas dried with magnesium sulfate
6. concentrationAfter concentration under reduced pressure
7. filtrationthe precipitated crystals were collected by filtration
8. washThe crystals were washed with hexane