Tri(butyl)vinyltin (10.5 g, 33.1 mmol) was added dropwise to a solution of 1,3-dibromo-5-difluoromethoxybenzene (9.1 g, 30.1 mmol; see step (i) above), tetrakis(triphenylphosphine)palladium(0) (700 mg, 0.60 mmol), and 2,6-di-tert-butyl-4-methylphenol (spatula tip) in toluene (125 mL) under nitrogen. The mixture was stirred at 50° C. overnight. The mixture was cooled to 0° C. and 1N NaOH (70 mL) was added. After 1 h, the mixture was extracted with CH2Cl2 (3×300 mL) then, the combined organics were dried (Na2SO4), filtered and concentrated in vacuo. Flash chromatography on silica gel eluting with hexanes afforded the sub-title compound (5.1 g, 68%) as a colourless oil.
