Sodium Hydroxide → 1-Fluoro-3-difluoromethoxy-5-vinylbenzene

Temperature

0 °C

Tri(butyl)vinylstannane (7.0 g, 22.2 mmol) was added to a suspension of 1-bromo-3-fluoro-5-difluoromethoxybenzene (4.9 g, 20.2 mmol; see step (iii) above), dichlorobis(triphenylphosphine)palladium(II) (1.42 g, 2.02 mmol) and anhydrous lithium chloride (0.90 g, 20.2 mmol) in THF (40 mL) under nitrogen at 65° C. and the mixture was stirred for 5 h. The reaction mixture was cooled to 0° C. and 1N NaOH (90 mL) was added. The biphasic mixture was vigorously stirred for 1 h then the layers were separated. The aqueous layer was extracted with Et2O (3× 70 mL). The combined organic layers were washed with 2N NaOH (2× 40 mL) and H2O (40 mL) then dried (Na2SO4), filtered and concentrated in vacuo. Flash chromatography on silica gel eluting with hexane afforded the sub-title compound (2.2 g, 57%) as a colourless oil.

1. stirringThe biphasic mixture was vigorously stirred for 1 h
2. customthe layers were separated
3. extractionThe aqueous layer was extracted with Et2O (3× 70 mL)
4. washThe combined organic layers were washed with 2N NaOH (2× 40 mL) and H2O (40 mL)
5. dry with materialthen dried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated in vacuo

ORD record

ord-ddaa4b882c15414d8b5d50e3872426d0

Source dataset

uspto-grants-2010_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07645751B2