3-(Trifluoromethyl)benzaldehyde → HCID 67275504, compound

Temperature

-10 °C

Vinylmagnesium bromide (40 mL of a 1.0 M THF solution, 40 mmol) was added to a dry round bottom flask under nitrogen. The solution was cooled to −10° C. and charged with meta-trifluoromethylbenzaldehyde (5.0 g, 29 mmol). The reaction was stirred for 1 h, warmed to RT and quenched with sat. NH4Cl. The mixture was extracted with EtOAC three times, and the organic extracts were dried (MgSO4) and concentrated in vacuo. The crude material was purified via flash chromatography to give 1-(3-trifluoromethylphenyl)propen-1-ol as an oil (5.0 g, 87% yield). A portion of 1-(3-trifluoromethylphenyl)propen-1-ol (0.5 g, 2.5 mmol) was dissolved in acetone (20 mL). The resultant solution was cooled to 0° C., treated with Jones reagent (1.14 mL of a 2.6 M solution, 2.96 mmol), and stirred for 10 minutes before being quenched with the addition of isopropyl alcohol (1.5 mL). The mixture was stirred for 5 min at rt, diluted with Et2O, filtered through Celite, washed with 10% Na2SO3. The material was purified via filtration through a plug of silica gel (1:1 Et2O:hexanes as eluant) to provide the 1-(3-trifluoromethylphenyl)propenone as an oil (320 mg, 65% yield), which solidified upon standing in the freezer. 1H-NMR (300 MHz, CDCl3): δ 8.20 (s, 1H), 8.13 (d, 1H, J=7.7 Hz), 7.84 (d, 1H, J=9.0 Hz),7.64 (t, 1H, J=7.7 Hz), 7.16 (dd, 1H, J=17.2, 10.6 Hz), 6.49 (dd, 1H, J=17.2, 1.5 Hz), 6.03 (dd, 1H, J=10.6, 1.5 Hz).

1. temperaturewarmed to RT
2. customquenched with sat. NH4Cl
3. extractionThe mixture was extracted with EtOAC three times
4. dry with materialthe organic extracts were dried (MgSO4)
5. concentrationconcentrated in vacuo
6. customThe crude material was purified via flash chromatography

ORD record

ord-1037201d6b3f45f49e67da30c066aa99

Source dataset

uspto-grants-2007_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07183270B2