Acetylglycine → 4-[5-(2-Acetylamino-acetylamino)-1-benzenesulfonyl-1H-pyrrolo[2,3-b]pyridin-4-ylamino]-piperidine-1-carboxylic acid tert-butyl ester

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Reaction Steps

A mixture of 4-(5-amino-1-benzene sulfonyl-1H-pyrrolo[2,3-b]pyridin-4-ylamino)-piperidine-1-carboxylic acid tert-butyl ester (1.00 g, 2.12 mmol), N-acetylglycine (0.30 g, 2.5 mmol), HBTU (1.0 g, 2.8 mmol) and DIEA (1.1 mL, 6.4 mmol) in DMF (5 mL) was stirred at ambient temperature for 20 h. Diluted with water and the solid was collected by filtration, washed with water and dried in vacuum oven at 50° C. for 20 h to afford 4-[5-(2-Acetylamino-acetylamino)-1-benzenesulfonyl-1H-pyrrolo[2,3-b]pyridin-4-ylamino]-piperidine-1-carboxylic acid tert-butyl ester (1.20 g, 99%). This intermediate was suspended in acetic acid (6 mL) and heated at 100° C. for 7 h. Cooled, diluted with DCM and stirred over aqueous sodium bicarbonate solution. Organic layer separated, washed with water, brine dried over sodium sulfate and concentrated in vacuo. The residue was purified by flash chromatography (silica gel, 0-10% MeOH/DCM) to afford 4-[2-(acetylamino-methyl)-6-benzenesulfonyl-6H-1,2,3,5,6-tetraaza-as-indacen-1-yl]-piperidine-1-carboxylic acid tert-butyl ester (0.26 g, 24%): LCMS (Method E, ESI): RT=1.53 min, m+1=553.2.

Provenance & Evidence