1-Hydroxybenzotriazole → HCID 57901630, compound

Participants

Reaction Steps

To a mixture of 7-[(2-thienylsulfonyl)amino]-1H-indole-2-carboxylic acid (420 mg), N,O-dimethylhydroxylamine hydrochloride (150 mg), triethylamine (0.24 mL), 1H-1,2,3-benzotriazol-1-ol (300 mg) and N,N-dimethylformamide (10 mL) was added N-[3-(dimethylamino)propyl]-N′-ethylcarbodiimide hydrochloride (380 mg) at 4° C., and the mixture was stirred at room temperature for 18 hr. The reaction mixture was diluted with ethyl acetate, washed with aqueous citric acid solution, aqueous sodium hydrogencarbonate solution and saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The obtained residue was subjected to silica gel column chromatography (ethyl acetate:hexane=5:95-1:1), and the obtained crystals were recrystallized from ethyl acetate-diethyl ether to give the title compound (395 mg, yield 83%) as pale-yellow needle crystals. melting point 180-181° C.

Provenance & Evidence