Hexane → 2-Acetyl-6-bromopyridine

Temperature

-80 °C

To a solution of 2,6-dibromopyridine (0.75 mol) in 2000 ml of anhydrous ether, which was cooled to -60° C. under N2, was added a solution of n-butyllithium in hexane (0.75 mol) over 15 minutes. The reaction mixture was cooled to -80° C. and a solution of dimethylacetamide (0.86 mol) in 70 ml anhydrous ether was added slowly over 1 hour. After stirring the mixture for 15 minutes, a solution of NH4Cl (0.93 mol) in 150 ml of water was added slowly over 8 minutes. After stirring an additional 45 minutes at room temperature, the aqueous layer was separated and extracted with 500 ml of ether. The combined organic layer was washed with water (2×800 ml), dried (MgSO4), filtered, and stripped on a rotary evaporator to yield 159 g of the desired product. This material was distilled at 80° C./0.1 mm Hg to give a near colorless oil that crystallized readily on cooling.

1. stirringAfter stirring an additional 45 minutes at room temperature
2. customthe aqueous layer was separated
3. extractionextracted with 500 ml of ether
4. washThe combined organic layer was washed with water (2×800 ml)
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. customstripped on a rotary evaporator

ORD record

ord-89ce8eb85f0442d7b4851f17e8ae121d

Source dataset

uspto-grants-1994_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05350696