反应详情

To a solution of 2-methyindole-4-carboxylic acid benzyl ester (690 mg; prepared in Reference Example 11) in N,N-dimethylformamide (8 ml) was added sodium hydride (114 mg; 60%) at 0° C., and the mixture was stirred at the same temperature for 30 minutes. To the reaction mixture was added 4-butoxybenzoyl chloride (0.54 ml), and the mixture was stirred at room temperature overnight. To the reaction mixture was added water and ethyl acetate, and then separated. The aqueous layer was extracted with ethyl acetate. The combined organic layer was washed with water and a saturated aqueous solution of sodium chloride, successively, dried and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (hexane-ethyl acetate) to give the title compound (1.02 g) having the following physical data.

1. stirringthe mixture was stirred at room temperature overnight
2. customseparated
3. extractionThe aqueous layer was extracted with ethyl acetate
4. washThe combined organic layer was washed with water
5. dry with materiala saturated aqueous solution of sodium chloride, successively, dried
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by column chromatography on silica gel (hexane-ethyl acetate)