Diisopropylethylamine → (S)-4-amino-N-(1-(4-chlorophenyl)-3-hydroxypropyl)-1-(1H-pyrazolo[3,4-d]pyrimidin-4-yl)piperidine-4-carboxamide

Participants

Reaction Conditions

Reaction Steps

DIPEA (0.419 mL, 2.41 mmol) was added to (S)-4-amino-N-(1-(4-chlorophenyl)-3-hydroxypropyl)piperidine-4-carboxamide (Intermediate 49) (250 mg, 0.80 mmol) and 4-chloro-1H-pyrazolo[3,4-d]pyrimidine (124 mg, 0.80 mmol) in butan-1-ol (5 mL). The resulting solution was stirred at 60° C. for 6 hours. The reaction mixture was diluted with EtOAc (50 mL), and washed sequentially with water (25 mL) and saturated brine (25 mL). The organic layer was dried over MgSO4, filtered and evaporated to afford crude product. The crude product was purified by flash silica chromatography, elution gradient 0 to 6% MeOH with ammonia in DCM. Pure fractions were evaporated to dryness and triturated with diethyl ether to afford (S)-4-amino-N-(1-(4-chlorophenyl)-3-hydroxypropyl)-1-(1H-pyrazolo[3,4-d]pyrimidin-4-yl)piperidine-4-carboxamide (112 mg, 32.5%) as a white solid.

Provenance & Evidence