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 6 h, and then diluted with H2O (10 mL) and CH2Cl2 (20 mL). 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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