Dimethylformamide → 4,5-Dimethyl-1,3-thiazole-2-carbaldehyde

Temperatur

-78 °C

Under argon, to a solution of 4,5-dimethylthiazole (0.62 g, 5.5 mmol) in anhydrous THF (40 mL) at −78° C., n-butyllithium (2.3 M in hexanes, 3.6 mL, 8.28 mmol) was slowly added and the reaction mixture was stirred at −78° C. for 1 h. Then a solution of anhydrous DMF (1.1 mL, 14.2 mmol) in anhydrous THF (10 mL) was added. The resulting mixture was stirred for 2.5 hours, allowing the temperature to raise to −60° C. Acetic acid (0.5 mL) and an aqueous solution of ammonium chloride were added, and warmed to room temperature. The resulting solution was extracted with diethyl ether and ethyl acetate. The combined organic phase were dried over sodium sulfate, filtered and evaporated. The crude product was purified by flash chromatography (silica gel, PE/EA, 1/0 to 7/3) to afford 4,5-dimethyl-1,3-thiazole-2-carbaldehyde, as a yellow oil which turns into a white solid after storage at −18° C. LCMS m/z (M+H) 142.1 found, 142.1 required.

1. stirringThe resulting mixture was stirred for 2.5 hours
2. temperatureto raise to −60° C
3. temperaturewarmed to room temperature
4. extractionThe resulting solution was extracted with diethyl ether and ethyl acetate
5. dry with materialThe combined organic phase were dried over sodium sulfate
6. filtrationfiltered
7. customevaporated
8. customThe crude product was purified by flash chromatography (silica gel, PE/EA, 1/0 to 7/3)

ORD-Eintrag

ord-801ada204f6745109a847aa7d54e3cfe

Quelldatensatz

uspto-grants-2016_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09353104B2