Dimethylacetamide → 2-Fluoro-6-methylbenzonitrile

Temperature

80 °C

A 10 L round bottom flask equipped with adapter, thermocouple and stir bar was charged with DMA (6 L) and degassed under vacuum and purged with N2 three times. To the mixture was added Palladium Tetrakis triphenylphosphine (87.5 g, 72.0 mmol) and the mixture was degassed under vacuum and purged with N2 three times. The reaction was heated to 80° C. for 30 min. 3-Fluoro-2-iodotoluene (575 g, 2.4 mol) and Zinc Cyanide (171.7 g, 1.46 mol) were added and the mixture was degassed under vacuum and purged with N2 three times. The reaction mixture was heated to 80° C. for 16 h and then allowed to cool to RT. The solution was added to a 2.0 L aqueous solution of 1N NH4OH and extracted three times with 1.5 L EtOAc. The extracts were washed with 2 L brine, dried over Na2SO4, filtered and concentrated. The crude product was treated with mCPBA in cooled DCM and then purified by chromatography (PE/EA=10:1) to get the title compound.

1. customA 10 L round bottom flask equipped with adapter
2. customdegassed under vacuum
3. custompurged with N2 three times
4. customthe mixture was degassed under vacuum
5. custompurged with N2 three times
6. customthe mixture was degassed under vacuum
7. custompurged with N2 three times
8. temperatureThe reaction mixture was heated to 80° C. for 16 h
9. temperatureto cool to RT
10. additionThe solution was added to a 2.0 L aqueous solution of 1N NH4OH
11. extractionextracted three times with 1.5 L EtOAc
12. washThe extracts were washed with 2 L brine
13. dry with materialdried over Na2SO4
14. filtrationfiltered
15. concentrationconcentrated
16. additionThe crude product was treated with mCPBA in cooled DCM
17. custompurified by chromatography (PE/EA=10:1)

ORD record

ord-154dd0ffcb234b83b6fc35090cc31e5d

Source dataset

uspto-grants-2015_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09206199B2