4-Methylpyridine → 1-Phenyl-2-(4-pyridinyl)ethanone

Temperatur

0 °C

Lithium diisopropyl amide (16.9 mL, 1.5 M in cyclohexane, 25.4 mmol) was added to THF (40 mL) at −78° C. A solution of 4-picoline (2.50 mL, 25.4 mmol) in THF (30.0 mL) was added dropwise to the LDA solution. The dry ice bath was removed. The reaction mixture was stirred at 0° C. for 30 minutes, and cooled down to −78° C. A solution of N-methoxy-N-methylbenzamide (1) (5.00 g, 29.6 mmol) in THF (20.0 mL) was added dropwise. The reaction mixture was warmed to room temperature and stirred overnight. The mixture was quenched with water, and extracted with ethyl acetate (3×). The pooled organic layer was dried over magnesium sulfate. The mixture was filtered, and the solvent was removed under vacuum to give the crude product. The crude material was triturated with hot hexane, and filtered to give 1-phenyl-2-(pyridin-4-yl) ethanone (2) as a yellow solid (3.53 g, 17.9 mmol, 70% yield).

1. customThe dry ice bath was removed
2. temperaturecooled down to −78° C
3. temperatureThe reaction mixture was warmed to room temperature
4. stirringstirred overnight
5. customThe mixture was quenched with water
6. extractionextracted with ethyl acetate (3×)
7. dry with materialThe pooled organic layer was dried over magnesium sulfate
8. filtrationThe mixture was filtered
9. customthe solvent was removed under vacuum
10. customto give the crude product
11. customThe crude material was triturated with hot hexane
12. filtrationfiltered

ORD-Eintrag

ord-cbd94337571048d99dac9f3cd0bb21b6

Quelldatensatz

uspto-grants-2014_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08735399B2