1,5-Dibromopentane → 1-(3,4-Difluorophenyl)cyclohexanecarbonitrile

To a solution of 2-(3,4-difluorophenyl)acetonitrile (2 g, 13.06 mmol) in 20 mL of DMF at 0° C. was added 60% sodium hydride (1.149 g, 28 7 mmol), and the mixture was stirred at the same temperature for 5 mins. Then a solution of 1,5-dibromopentane (1.779 mL, 13.06 mmol) in 20 mL of DMF was added dropwise and the mixture was stirred at a temperature in the range of 0° C. to room temperature for 5 hrs. The reaction was quenched with water, and extracted with EtOAc. The mixture was washed with water and brine. The combined aqueous layers were back extracted with EtOAc once and washed with brine. The combined extracts were dried over Na2SO4 and evaporated to give an oily residue. It was purified by Combiflash (120 g silica gel) eluting with 1:9 EtOAc-hexane to give 1-(3,4-difluorophenyl)cyclohexanecarbonitrile (Int. 3-A, 2.52 g, 11.39 mmol, 87% yield). 1H NMR (400 MHz, CDCl3) δ ppm 7.12-7.35 (3 H, m), 2.14 (2 H, d, J=11.86 Hz), 1.75-1.95 (6 H, m), 1.64-1.75 (2 H, m).

1. stirringthe mixture was stirred at a temperature in the range of 0° C. to room temperature for 5 hrs
2. customThe reaction was quenched with water
3. extractionextracted with EtOAc
4. washThe mixture was washed with water and brine
5. extractionThe combined aqueous layers were back extracted with EtOAc once
6. washwashed with brine
7. dry with materialThe combined extracts were dried over Na2SO4
8. customevaporated
9. customto give an oily residue
10. customIt was purified by Combiflash (120 g silica gel)
11. washeluting with 1:9 EtOAc-hexane

ORD record

ord-83704363ac0a498fb45eeb67314a56c8

Source dataset

uspto-grants-2015_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09187437B2