Diisopropylethylamine → (S)-tert-butyl (4-(1-(4-chlorophenyl)-3-hydroxypropylcarbamoyl)-1-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidin-4-yl)methylcarbamate

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(S)-3-Amino-3-(4-chlorophenyl)propan-1-ol (Intermediate 47) (247 mg, 1.33 mmol) was added in one portion to 4-((tert-butoxycarbonylamino)methyl)-1-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidine-4-carboxylic acid (Intermediate 12) (500 mg, 1.33 mmol) and DIPEA (0.698 mL, 4.00 mmol) in DMA (6 mL). O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (557 mg, 1.47 mmol) was added and the resulting solution was stirred at 20° C. for 2 hours then 20° C. for 18 hours. The reaction mixture was diluted with EtOAc (50 mL), and washed sequentially with water (20 mL) and saturated brine (20 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. Pure fractions were evaporated to dryness to afford (S)-tert-butyl (4-(1-(4-chlorophenyl)-3-hydroxypropylcarbamoyl)-1-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidin-4-yl)methylcarbamate (428 mg, 59.2%) as a colourless gum. The product (428 mg) was dissolved in dioxane (6.00 mL) and 4M hydrogen chloride in dioxane (0.925 mL, 26.64 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 crude product was purified by preparative HPLC (Waters XBridge Prep C18 OBD column, 5 μm silica, 19 mm diameter, 100 mm length), using decreasingly polar mixtures of water (containing 1% ammonia) and MeCN as eluents. Fractions containing the desired compound were evaporated to dryness to afford (S)-4-(aminomethyl)-N-(1-(4-chlorophenyl)-3-hydroxypropyl)-1-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidine-4-carboxamide (192 mg, 32.5%) as a white dry film.

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