Nitromethane → 2,6-Difluoro-4-(2-nitro-vinyl)-phenol

Temperature

110 °C

3,5-Difluoro-4-hydroxybenzaldehyde (2.27 g, 14.4 mmol), nitromethane (4.7 mL, 86.4 mmol) and ammonium acetate (4.4 g, 57.6 mmol) were dissolved in acetic acid (22 mL) and the reaction mixture was heated at 110° C. for 1 hour 30 min. The reaction was concentrated under reduced pressure and the residue partitioned between ether and water, the layers were separated and the organic layer was dried with Na2SO4. The organic mixture was filtered and the filtrate concentrated under reduced pressure to afford a crude product. The crude product was purified by flash column chromatography (eluent: EtOAc/hexane 22/78) to afford the title compound (2.05 g, yield: 71%). Electrospray MS M−1 ion=200. 1H-NMR (CDCl3, 200 MHz): 7.84 (d, 1H, J=13.7 Hz), 7.45 (d, 1H, J=13.7 Hz), 7.19-6.99 (m, 2H).

1. concentrationThe reaction was concentrated under reduced pressure
2. customthe residue partitioned between ether and water
3. customthe layers were separated
4. dry with materialthe organic layer was dried with Na2SO4
5. filtrationThe organic mixture was filtered
6. concentrationthe filtrate concentrated under reduced pressure
7. customto afford a crude product
8. customThe crude product was purified by flash column chromatography (eluent: EtOAc/hexane 22/78)

ORD record

ord-e2b797adcd6c43718caa9b8ddeaf9e3d

Source dataset

uspto-grants-2009_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07560463B2