Dimethylformamide → 3,5-Dimethylpyridine-4-carbaldehyde

Temperature

-78 °C

A solution of 4-bromo-3,5-dimethylpyridine (0.70 g, 3.76 mmol) in ether (10 mL) was cooled to −78° C. and then 2.50 M n-butyllithium in hexane (1.50 mL) was added to the reaction flask dropwise. After stirring at −78° C. for 1 h, DMF (1.75 mL, 22.6 mmol) was added to the reaction flask slowly. The reaction solution was allowed to warm to room temperature overnight. The reaction was quenched with 10 mL saturated NH4Cl solution and diluted with ethyl acetate. The aqueous layer was extracted with ethyl acetate once. The combined organic solutions were dried over Na2SO4, filtered and concentrated. The residue was purified by silica gel chromatography (40% to 50% ethyl acetate/hexanes) to afford the desired product as a solid. (280 mg, 55%). 1H NMR (400 MHz, CDCl3): δ 10.62 (s, 1H), 8.43 (s, 2H), 2.57 (s, 6H).

1. temperatureto warm to room temperature overnight
2. customThe reaction was quenched with 10 mL saturated NH4Cl solution
3. additiondiluted with ethyl acetate
4. extractionThe aqueous layer was extracted with ethyl acetate once
5. dry with materialThe combined organic solutions were dried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated
8. customThe residue was purified by silica gel chromatography (40% to 50% ethyl acetate/hexanes)

ORD record

ord-9c46dd8f4dbc46b6b5737cd0664568d4

Source dataset

uspto-grants-2013_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08563541B2