2,6-Dibromopyridine → 6-bromo-N-[(1S)-1-(3-nitrophenyl)ethyl]pyridin-2-amine

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of (1S)-1-(3-nitrophenyl)ethanamine (365 mg, 2.2 mmol), 2,6-dibromopyridine (474 mg, 2 mmol), tris(dibenzylidene)dipalladium(0) (92 mg, 0.1 mmol), (+/−)-bis(diphenyphosphino)-1,1′-binaphthalene (125 mg, 0.2 mmol) and sodium tert-butoxide (270 mg, 2.8 mmol) in anhydrous toluene (4 mL) was heated at 80° C. for 17 hours. The mixture was cooled, diluted with ethyl acetate (50 mL), washed successively with saturated aqueous sodium hydrogen carbonate (3×30 mL) and brine (30 mL), dried (Na2SO4) and concentrated under reduced pressure to give a black oil which was purified by flash chromatography (silica, ethyl acetate/hexanes) to give 6-bromo-N-[(1S)-1-(3-nitrophenyl)ethyl]pyridin-2-amine (210 mg, 33%) and the di-addition product (205 mg, 50%) both as yellow oils.

Herkunft & Nachweise