Diisopropylethylamine → HCID 66673790, compound

Participants

Reaction Conditions

Reaction Steps

(S)-3-Amino-3-phenylpropan-1-ol hydrochloride (260 mg, 1.38 mmol) was added in one portion to 4-(tert-butoxycarbonylamino)-1-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidine-4-carboxylic acid (Intermediate 21) (500 mg, 1.38 mmol) and DIPEA (0.967 mL, 5.53 mmol) in DMA (5 mL). O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (579 mg, 1.52 mmol) was added and the resulting solution was stirred at 20° C. for 24 hours. The reaction mixture was evaporated to dryness then diluted with EtOAc (300 mL), and washed sequentially with water (50 mL) and saturated brine (50 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 2 to 6% MeOH with ammonia in DCM. Fractions were evaporated to afford (S)-tert-butyl 4-(3-hydroxy-1-phenylpropylcarbamoyl)-1-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidin-4-ylcarbamate (334 mg, 48.8%) as a white solid. The product (334 mg, 0.67 mmol) was suspended in dioxane (5.00 mL) and 4M hydrogen chloride in dioxane (0.961 mL, 27.67 mmol) added. The reaction was stirred at ambient temperature for 2 hours. The crude product was purified by ion exchange chromatography, using an SCX column. The desired product was eluted from the column using 3.5N ammonia/MeOH and pure fractions were evaporated to dryness. The resulting gum was triturated with EtOAc to give a solid which was collected by filtration and dried under vacuum to give (S)-4-amino-N-(3-hydroxy-1-phenylpropyl)-1-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidine-4-carboxamide (93 mg, 17.0%) as an off white solid.

Provenance & Evidence