反应详情

To a cooled suspension of 14.3 g of 2-methoxy-5-sulfamoylbenzoic acid in 60 ml of tetrahydrofuran were successively added dropwise 6.25 g of triethylamine and 7.45 g of pivaloyl chloride with stirring. The mixture was stirred at the same temperature for 1 hour and then a solution of 10.0 g of 4-[2-(dimethylamino)ethoxy]-benzylamine in 40 ml of tetrahydrofuran was added dropwise with stirring. The mixture was stirred at room temperature for 14 hours and the solvent was evaporated. Hydrochloric acid (10%) was added to the residue and the aqueous solution was washed with ethyl acetate. The aqueous layer was made alkaline with potassium carbonate to give a precipitate, which was washed with water and ethyl acetate, of 16.6 g of colorless crystals. Recrystallization of the crystals from ethanol gave the title compound as colorless needles, m.p. 154°-155° C.

1. stirringThe mixture was stirred at the same temperature for 1 hour
2. stirringwith stirring
3. stirringThe mixture was stirred at room temperature for 14 hours
4. customthe solvent was evaporated
5. additionHydrochloric acid (10%) was added to the residue
6. washthe aqueous solution was washed with ethyl acetate
7. customto give a precipitate, which
8. washwas washed with water and ethyl acetate, of 16.6 g of colorless crystals
9. customRecrystallization of the crystals from ethanol