Reaktion #692186

Reaktionsgleichung

HCl

n-butyl lithium hexane

2,2-dimethyl-N-(3-pyridinyl)propanamide

dimethyl formamide

→

title compound

1-N-(4-formylpyridine-3-yl)-2,2-dimethylpropanamide

Lösungsmittel

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThis reaction was slowly warmed to −5° C.
2. 2
   Sonstigegiving a copious precipitate
3. 3
   TemperaturThis mixture was cooled to −70° C.
4. 4
   Temperaturto warm to room temperature
5. 5
   Sonstigegiving a clear yellow solution
6. 6
   Extraktionextracted with diethyl ether
7. 7
   TrocknenThe organic layer was dried (Na2SO4)
8. 8
   Filtrationfiltered
9. 9
   Sonstigethe solvent evaporated
10. 10
    SonstigeThe residue was purified by column chromatography
11. 11
    Wascheneluting with 30-100% ethyl acetate/hexane
12. 12
    Sonstigethe solvent removed in vacuo

Vorschrift

A solution of 2,2-dimethyl-N-(3-pyridinyl)propanamide (3.56 gm, 20 mmol) (prepared as described in J. Org. Chem. 48, 3401 (1983)) in anhydrous tetrahydrofuran (40 mL) was cooled to −70° C. and a solution of 2.5 M n-butyl lithium/hexane (20 mL, 50 mmol) was added dropwise maintaining the temperature at −70° C. This reaction was slowly warmed to −5° C. giving a copious precipitate. This mixture was cooled to −70° C. and dry dimethyl formamide (4.64 mL, 60 mmol) was added. The reaction was allowed to warm to room temperature giving a clear yellow solution. This reaction was poured into 8 N aqueous HCl (16 mL) and ice. After stirring for 10 minutes the pH of the solution was adjusted to 7 and extracted with diethyl ether. The organic layer was dried (Na2SO4), filtered and the solvent evaporated. The residue was purified by column chromatography eluting with 30-100% ethyl acetate/hexane. The appropriate fractions were combined and the solvent removed in vacuo to give the title compound as a solid. 1H-NMR (500 MHz, CDCl3): δ 10.92 (1H, br s), 10.15 (1H, s), 10.05 (1H, s), 8.62 (2H, d, J=4.9 Hz), 7.56 (1H, d, J=4.9 Hz),), 1.39 (9H, s). m/e (m+1): 235.3.

Quelle