Ethylene Oxide → 3-Bromo-4-(3-hydroxypropyl)pyridine

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Diisopropylamine (7.1 g, 70 mmol) is dissolved in THF (100 ml), and thereto is added a solution of n-butyl lithium in hexane (35.7 ml, 60 mmol) at −70° C., and the mixture is stirred for 15 minutes. Then, to the mixture is added a solution of 3-bromo-4-methylpyridine (8.6 g, 50 mmol) in THF (30 ml). Ten minutes thereafter, to the mixture is added ethylene oxide (2.6 g, 60 mmol), and the mixture is warmed to 0° C. over a period of time for one hour. The reaction is quenched with a saturated brine (50 ml), and the mixture is extracted with ethyl acetate (150 ml×2). The organic layer is washed with a saturated brine (100 ml×2), dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue is purified by silica gel column chromatography (eluent: ethyl acetate/hexane) to give the title compound (8.5 g) as a pale yellow oil.

Herkunft & Nachweise