2,6-Dibromopyridine → 2-Acetyl-6-bromopyridine

Temperature

-78 °C

To a solution of 3.00 g (12.7 mmol) of 2,6-dibromopyridine in 20 mL anhydrous. Et2O at −78° C. was added dropwise over 30 rnin. 8.0 mL (12.8 mmol) of 1.6 M n-BuLi in cyclohexane. After stirring for 3 h at −78° C., 8.2 mL (88 mmol) of N,N-dimethylacetamide was added dropwise and the solution was stirred at −78° C. for 1 h. On warming to RT, Et2O (100 mL) and saturated aqueous NH4Cl (50 mL) were added and the layers were separated. The organic layer was dried over NaSO4 and the volatiles were removed by rotary evaporation. The resulting yellow solid was recrystallized from hexanes to provide 1.8 g (71 %) of 2-acetyl-6-bromopyridine as colorless crystals. 1H NMR (CDCl3): δ 2.81 (s, 3H); 7.67-7.77 (m, 2 H); 8.22 (dd, J=6.8, 1.6 Hz, 1 H). Mass Spec.: m/e 200.

1. stirringthe solution was stirred at −78° C. for 1 h
2. temperatureOn warming to RT
3. customthe layers were separated
4. dry with materialThe organic layer was dried over NaSO4
5. customthe volatiles were removed by rotary evaporation
6. customThe resulting yellow solid was recrystallized from hexanes

ORD record

ord-c811a100187e4500ae68bccef2cd9b72

Source dataset

uspto-grants-2001_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06248540B1