Reaktion #3405

Reaktionsgleichung

NH4Cl

benzyl alcohol

Sodium hydride

3,5-dibromopyridine

→

solid

Ausbeute 72.1%

3-Benzyloxy-5-bromopyridine

Ausbeute 72.1%

Lösungsmittel

water

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGto stir for 16 hours
2. 2
   Extraktionthe mixture was extracted with Et2O (5×300 mL)
3. 3
   WaschenThe combined Et2O extracts were washed with 50% brine (6×300 mL)
4. 4
   Trocknendried (MgSO4)
5. 5
   Einengenconcentrated
6. 6
   Sonstigethe residue recrystallized from Et2O

Vorschrift

Sodium hydride (60% in mineral oil, 40.9 g, 1.0 mol) in DMF (800 mL) was cooled to 0° C., and benzyl alcohol (105 mL, 1.0 mol) was slowly added. After stirring for 1 hour at ambient temperature, 3,5-dibromopyridine (200.4 g, 846 mmol) was added and the mixture allowed to stir for 16 hours. Saturated NH4Cl solution (500 mL) was added followed by water (400 mL), and the mixture was extracted with Et2O (5×300 mL). The combined Et2O extracts were washed with 50% brine (6×300 mL), dried (MgSO4), concentrated and the residue recrystallized from Et2O to afford a white solid (161 g, 72%): 1H NMR (CDCl3, 300 MHz) δ5.10 (s, 2H), 7.50-7.35 (m, 6H), 8.37-8.27 (m, 2H); MS (CI/NH3) m/z: 264/266 (M+H)+.

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