Diisopropylethylamine → HCID 68757534, compound

Participants

Reaction Steps

DIEA (d 0.742; 0.102 mL, 0.585 mmol) was added to a solution of 4-(piperazin-1-yl)-1H-pyrazolo[3,4-b]pyridine-5-carbonitrile dihydrochloride (0.0661 g, 0.219 mmol), (S)-3-(tert-butoxycarbonyl(isopropyl)amino)-2-(4-chlorophenyl)propanoic acid (0.050 g, 0.146 mmol, see Example B) and TBTU (0.0564 g, 0.176 mmol) in DCM (1 mL) and stirred at room temperature for 18 hours. The mixture was directly loaded onto a silica column and purified by chromatography (hexane:ethyl acetate, 1:1) to give (S)-tert-butyl 2-(4-chlorophenyl)-3-(4-(5-cyano-1H-pyrazolo[3,4-b]pyridin-4-yl)piperazin-1-yl)-3-oxopropyl(isopropyl)carbamate as a solid. The solid was dissolved in DCM (1 mL), and TFA (0.2 mL) was added. The mixture was stirred at room temperature for 1 hour and concentrated to dryness. The resulting residue was dissolved in DCM (0.5 mL), and HCl in ether (1 mL, 2N) was added. The resulting solid was collected by filtration to give (S)-4-(4-(2-(4-chlorophenyl)-3-(isopropylamino)propanoyl)piperazin-1-yl)-1H-pyrazolo[3,4-b]pyridine-5-carbonitrile dihydrochloride (0.043 g, 56%). MS APCI (+) m/z 452.1 detected.

Provenance & Evidence