Dimethylformamide dimethyl acetal → 4-(4-Methoxypyridin-2-yl)-2-nitrobenzaldehyde

Temperatur

140 °C

To a solution of 4-(4-methoxypyridin-2-yl)-2-nitrotoluene (2.5 g) in N,N-dimethylformamide (15 ml) was added N,N-dimethylformamide dimethyl acetal (2.72 ml), and the mixture was stirred at 140° C. for 24 hours under a nitrogen atmosphere. The reaction mixture was evaporated under reduced pressure, and the residue was suspended in tetrahydrofuran (60 ml) and water (60 ml). Sodium metaperiodate (6.57 g) was added to the suspension, and the mixture was stirred at ambient temperature for 3 hours. The reaction mixture was filtered, and the filtrate was extracted with ethyl acetate. The separated organic layer was washed with brine, dried over magnesium sulfate and evaporated under reduced pressure. The residue was purified by column chromatography (silica gel 150 g, 25-45% ethyl acetate in n-hexane) to give 4-(4-methoxypyridin-2-yl)-2-nitrobenzaldehyde (1.99 g).

1. customThe reaction mixture was evaporated under reduced pressure
2. additionSodium metaperiodate (6.57 g) was added to the suspension
3. stirringthe mixture was stirred at ambient temperature for 3 hours
4. filtrationThe reaction mixture was filtered
5. extractionthe filtrate was extracted with ethyl acetate
6. washThe separated organic layer was washed with brine
7. dry with materialdried over magnesium sulfate
8. customevaporated under reduced pressure
9. customThe residue was purified by column chromatography (silica gel 150 g, 25-45% ethyl acetate in n-hexane)

ORD-Eintrag

ord-f5c2a905307645d496bfa72357bead6e

Quelldatensatz

uspto-grants-2003_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06521643B1