Diisopropylethylamine → (S)-N-(1-(5-Fluoropyridin-2-yl)ethyl)-2-(pyrazolo[1,5-a]pyrazin-3-yl)pyrimidin-4-amine

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Reaction Steps

A solution of 3-(4-chloropyrimidin-2-yl)pyrazolo[1,5-a]pyrazine (Preparation 31, 170 mg, 0.61 mmol), (S)-1-(5-fluoropyridin-2-yl)ethanamine (85 mg, 0.61 mmol, prepared as described in WO2006/82392A1) and diisopropylethylamine (122 μL, 0.70 mmol) in N,N′-dimethylformamide (5 mL) was heated to 150° C. in a microwave oven for 75 min. The solvent was then removed under reduced pressure and the residue was partitioned between 4% aqueous sodium hydrogen carbonate solution and ethyl acetate. The organic phase was separated, washed with brine, dried (MgSO4) and concentrated to give a crude which was purified by reverse phase chromatography (C-18 silica from Waters, water/acetonitrile/methanol as eluents [0.1% v/v formic acid buffered] 5% to 50%) to give the title compound (9 mg, 4%) as an oil. The corresponding fumarate salt was prepared by adding a solution of fumaric acid (3.1 mg, 0.027 mmol) in ethanol (0.5 mL) to a solution of the title compound (as free base, 9 mg, 0.027 mmol) in ethanol (2 mL) followed by evaporation of the solvent. The resulting solid was dried in an oven under vacuum to give 11 mg of the desired fumarate salt.

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