反应详情

To a mixture of 7-[methyl(2-thienylsulfonyl)amino]-1H-indole-2-carboxylic acid (0.50 g), 1H-1,2,3-benzotriazol-1-ol (0.24 g) and N,N-dimethylformamide (10 mL) was added N-[3-(dimethylamino)propyl]-N′-ethylcarbodiimide hydrochloride (0.30 g) at room temperature. The mixture was stirred for 10 min, and ethyl hydrazino(oxo)acetate (0.33 g) was added. The reaction mixture was stirred at room temperature for 2 hr, water was added, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated brine, dried (MgSO4) and concentrated. The obtained residue was subjected to silica gel column chromatography and the title compound (0.43 g, yield 63%) was obtained as colorless crystals from a fraction eluted with ethyl acetate. melting point 133-134° C.

1. stirringThe reaction mixture was stirred at room temperature for 2 hr
2. extractionthe mixture was extracted with ethyl acetate
3. washThe ethyl acetate layer was washed with saturated brine
4. dry with materialdried (MgSO4)
5. concentrationconcentrated