4-Methylpyridine → (R)-4-(4-bromophenyl)-1-(pyridin-4-yl)-4-o-tolylbutan-2-one

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Reaction Steps

To a solution of 4-methylpyridine (308 mg, 3.31 mmol) in tetrahydrofuran at −78° C. was added dropwise n-butyllithium solution (1.6 M in hexane, 2.07 mL, 3.31 mmol). The reaction mixture was stirred for 1 hour at room temperature and cooled down again to −78° C. (R)-3-(4-bromo-phenyl)-N-methoxy-N-methyl-3-o-tolyl-propionamide (example 142, step 1; 400 mg, 1.1 mmol) was added and the reaction mixture was stirred at room temperature for 3 hours. A saturated solution of sodium hydrogencarbonate and ethyl acetate were added, the phases were separated and the inorganic one was extracted with ethyl acetate (2×). The combined organic layers were washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The crude product was purified by flash chromatography on silica gel (10% methanol in dichloromethane) to yield the title compound as a yellow oil (51%), MS (ESI+): m/z=394.0 ([M+H]+).

Provenance & Evidence