Morpholine → 4-(5-Bromopyridin-3-yl)morpholine

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a solution of [3,5-dibromopyridine (1000 mg, 0.004 mol) in 1,4-dioxane (8 mL, 0.1 mol), morpholine (400 mg, 0.004 mol) and sodium tert-butoxide (400 mg, 0.004 mol) were added. The reaction was bubbled with nitrogen. Tetrakis(triphenylphosphine)palladium(0) (200 mg, 0.0002 mol) was added and nitrogen was bubbled through for couple of minutes. The mixture was heated at 80° C. overnight. The reaction was allowed to cool to rt and was then partitioned between water and ethyl acetate. The organic layer was washed with saturated sodium chloride, dried over magnesium sulfate, filtered and concentrated to give a crude residue. The crude product was purified by FCC on silica gel eluting with 1:1, EtOAC:Hexane gave to give 4-(5-bromopyridin-3-yl)morpholine as a viscous oil (400 mg, 40%). 1H NMR (400 MHz, CDCl3): 8.2 (s, 1H), 8.1 (s, 1H), 7.2 (s, 1H), 3.8 (m, 4H), 3.2 (m, 4H).

Herkunft & Nachweise