Acetic Acid → 6-chloro-N-[(1S)-1-(3-{[1-(3-methylphenyl)ethyl]amino}phenyl)ethyl]pyrazin-2-amine

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To a solution of 1-(5-methylpyridin-3-yl)ethanone (135 mg, 1 mmol) and N-[(1S)-1-(3-aminophenyl)ethyl]-6-chloropyrazin-2-amine (248 mg, 1 mmol) in 1,2-dichloroethane (5 mL) was added sodium triacetoxyborohydride (300 mg, 1.4 mmol), in one portion, and glacial acetic acid (0.18 mL, 3 mmol). The mixture was heated in the microwave reactor at 80° C. for 1 hour. After this time the mixture was stirred with dilute aqueous hydrochloric acid (2M, 7 mL) for 15 minutes and the two phases were separated. The aqueous phase was basified to pH 9 with solid potassium hydroxide and was extracted with dichloromethane (2×20 mL). The extracts were washed with brine (20 mL), dried (MgSO4) and concentrated under reduced pressure to give an orange oil which was purified by flash chromatography (silica, ethyl acetate/methanol) to give 6-chloro-N-[(1S)-1-(3-{[1-(3-methylphenyl)ethyl]amino}phenyl)ethyl]pyrazin-2-amine (52 mg, 14%) as a pale yellow oil.

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