Dimethylformamide → 2,3-Dimethoxyisonicotinaldehyde

Temperatur

0 °C

To a solution of 2,3-dimethoxypyridine (1.0 g, 7.19 mmol) in dry THF (30 mL), cooled to −78° C., was added 2.5 M nBuLi in hexanes (6.33 mL, 15.8 mmol). The mixture was allowed to warm to 0° C. and stirred for 1 hour, before cooling to −78° C. A solution of DMF (2.4 mL, 31.5 mmol) in THF (5 mL) was added. The reaction mixture was allowed to warm to 0° C. and saturated aqueous ammonium chloride solution was added. The resultant biphasic mixture separated and extracted twice with diethyl ether. The combined organic phase was washed with water, and brine, dried (Na2SO4), filtered, and concentrated in vacuo. The resultant residue was subjected to flash chromatography (SiO2, gradient 15 to 20% ethyl acetate in cyclohexane) to afford the title compound (0.79 g, 65%) as a white solid. LCMS (Method B): RT-=2.71 min, [M+H]+=168.

1. temperaturebefore cooling to −78° C
2. temperatureto warm to 0° C.
3. customThe resultant biphasic mixture separated
4. extractionextracted twice with diethyl ether
5. washThe combined organic phase was washed with water, and brine
6. dry with materialdried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated in vacuo

ORD-Eintrag

ord-7067939d09c1419795038acedb897f2c

Quelldatensatz

uspto-grants-2013_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08546376B2