Acetyl chloride → [4-(3-Acetylamino-benzenesulfonylamino)-4,5,6,7-tetrahydro-indazol-1-yl]-acetic acid ethyl ester

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Reaction Steps

To a solution of [4-(3-amino-benzenesulfonylamino)-4,5,6,7-tetrahydro-indazol-1-yl]-acetic acid ethyl ester (30 mg, 0.079 mmol) and acetyl chloride (9.2 mg, 0.119 mmol) in tetrahydrofuran (3 mL) was added triethylamine (16 mg, 0.158 mmol) at 0° C. After being stirred at room temperature overnight, the mixture was concentrated in vacuo. The residue was purified by flash column (gradient elution, 0-5% methanol in dichloromethane) to afford [4-(3-acetylamino-benzenesulfonylamino)-4,5,6,7-tetrahydro-indazol-1-yl]-acetic acid ethyl ester (24 mg, 72%) as a white solid. MS cald. for C19H24N4O5S 420, obsd. (ESI+) [(M+H)+] 421.

Provenance & Evidence