Acetic Acid → 1-(2,4-Dimethyl-1H-pyrrol-3-yl)-2,2,2-trifluoroethan-1-one

According to the literature procedure (Chiswell, B. Inorganica Chimica Acta. 1972, 629), a mixture of anti-pyruvic aldehyde 1-oxime (1.3 g, 15 mmol), 1,1,1-trifluoro-2,4-pentadione (1.85 mL, 15 mmol), glacial acetic acid (12 mL) and H2O (3.0 mL) was stirred vigorously at room temperature. To this flask, zinc dust (3 g) was added slowly keeping the temperature below 60° C. After addition, the resulting brown solution was heated under reflux condition for 2 hours. After cooling down to room temperature, the reaction mixture was basified by an addition of 2 M aqueous NaOH, then filtered. The filtrate was extracted with CH2Cl2 (20 mL×3), the combined organic layer dried over MgSO4, and concentrated iii vacito. The residue was purified by flash chromatography (1-3:1 CH2Cl2-Hexane) to afford the subtitle compound (0.42 g, 15% yield) as an oil.

1. customthe temperature below 60° C
2. additionAfter addition
3. temperaturethe resulting brown solution was heated
4. temperatureunder reflux condition for 2 hours
5. temperatureAfter cooling down to room temperature
6. filtrationfiltered
7. extractionThe filtrate was extracted with CH2Cl2 (20 mL×3)
8. dry with materialthe combined organic layer dried over MgSO4
9. concentrationconcentrated iii vacito
10. customThe residue was purified by flash chromatography (1-3:1 CH2Cl2-Hexane)

ORD record

ord-e3f6607b56ed446083e024d17b6a07fc

Source dataset

uspto-grants-2002_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06417202B1