Diisopropylethylamine → 3-(4-((2-(1H-imidazol-5-yl)acetamido)methyl)-1-(5-methyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidine-4-carboxamido)phenyl dimethylcarbamate

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To a suspension of 2-(1H-imidazol-5-yl)acetic acid (0.238 g, 1.47 mmol) and HATU (0.372 g, 0.978 mmol) in CH2Cl2 (5 mL) was added N,N-diisopropylethylamine (0.51 mL, 2.93 mmol). The resulting solution was allowed to stir for 20 min. at room temperature. To this solution was added the acetate salt of 3-(4-(aminomethyl)-1-(5-methyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)piperidine-4-carboxamido)phenyl dimethylcarbamate (from example 20, 0.500 g, 0.978 mmol) and N,N-diisopropylethylamine (0.17 mL) in CH2Cl2 (5 mL). The reaction was allowed to stir at room temperature for 6h, and then diluted with H2O (10 mL) and CH2Cl2 (20mL). The mixture was extracted with CH2Cl2 (2×10 mL), and the combined organics were washed with NaHCO3 (10 mL) and brine (10 mL), dried over MgSO4, and concentrated under vacuum. The residue was purified by flash chromatography (3-10% MeOH:CH2Cl2) to afford the title compound (0.393 g, 72% yield) as a white solid. This solid was suspended in water, and acetic acid was added until the solution became clear. This solution was frozen and lyophilized to the di-acetate salt of the title compound (0.477 g).

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