Water → HCID 66858627, compound

Temperature

80 °C

Step T (1): A mixture of 2,4-dimethyl-1H-imidazole (5.00 g, 52.0 mmol), 1,2-difluoro-4-nitrobenzene (8.27 g, 52.0 mmol), and sodium bicarbonate (4.37 g, 52.0 mmol) in DMSO (100 mL) was heated at 80° C. for 24 h. The reaction mixture was allowed to cool to rt and was poured into water (800 mL). The aqueous mixture was extracted with EtOAc (3×200 mL). The combined organic extracts were sequentially washed with water (500 mL) and brine solution (100 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo. The dark residue was dissolved in ethyl acetate (200 mL). Hexane (50 mL) was added to the solution. The resulting mixture was allowed to age for 72 h at rt. The resulting solid was collected by vacuum filtration. The solid was dried under high vacuum to afford 1-(2-fluoro-4-nitrophenyl)-2,4-dimethyl-1H-imidazole (6.68 g, 27.8 mmol, 54% yield) as a yellow crystalline solid. LC-MS (M+H)+=236.1. 1H NMR (500 MHz, CHLOROFORM-d) δ ppm 8.13-8.22 (m, 2 H), 7.51 (dd, J=8.9, 7.3 Hz, 1 H), 6.72 (s, 1 H), 2.28-2.36 (m, 3 H), 2.22-2.28 (m, 3 H).

1. temperatureto cool to rt
2. extractionThe aqueous mixture was extracted with EtOAc (3×200 mL)
3. washThe combined organic extracts were sequentially washed with water (500 mL) and brine solution (100 mL)
4. dry with materialThe organic layer was dried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. dissolutionThe dark residue was dissolved in ethyl acetate (200 mL)
8. additionHexane (50 mL) was added to the solution
9. filtrationThe resulting solid was collected by vacuum filtration
10. customThe solid was dried under high vacuum

ORD record

ord-01a9c95182e44fc5b39696af7f62f2d0

Source dataset

uspto-grants-2013_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08349880B2