4-[Benzyl(methyl)amino]cyclohexan-1-one → 4-(Benzyl(methyl)amino)-1-(2-(dimethylamino)pyridin-4-yl)cyclohexanol

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Reaction Steps

n-BuLi (3 ml, 5.98 mmol, 1.2 eq., 2 M solution in hexane) was added at −78° C. to a solution of 4-bromo-N,N-dimethylpyridin-2-amine (978 mg, 5.23 mmol, 1.05 eq.) in diethyl ether (15 ml) and the mixture was stirred for 45 minutes. A solution of 4-(benzyl(methyl)amino)cyclo-hexanone (stage 3, AMN-50) (1.08 g, 4.9, 8 mmol 1.0 eq.) in diethyl ether (10 ml) was added dropwise thereto at the same temperature. The reaction mixture was stirred for 16 hours at RT and was then hydrolyzed with sat. ammonium chloride solution (30 ml) and extracted with ethyl acetate (3×60 ml). The combined org. phases were washed with sat. NaCl solution (100 ml), dried over sodium sulfate, concentrated and purified by column chromatography (silica gel, 2,5% MeOH in DCM). Yield: 71% (1.20 g, 3.54 mmol)

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