[F:1][C:2]1[C:7](I)=[C:6]([F:9])[C:5]([O:10][CH3:11])=[CH:4][C:3]=1[O:12][CH3:13].[CH3:14][Si:15]([C:18]#[CH:19])([CH3:17])[CH3:16].C(N(CC)CC)C.CN(C)C=O>[Cu]I.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[F:1][C:2]1[C:3]([O:12][CH3:13])=[CH:4][C:5]([O:10][CH3:11])=[C:6]([F:9])[C:7]=1[C:19]#[C:18][Si:15]([CH3:17])([CH3:16])[CH3:14]
To a stirred mixture of 2,4-difluoro-3-iodo-1,5-dimethoxybenzene (740 mg, 2.47 mmol), (trimethylsilyl)acetylene (0.697 mL, 4.93 mmol), copper(I) iodide (38 mg, 0.20 mmol), and triethylamine (0.52 mL, 3.7 mmol) in N,N-dimethylformamide (DMF) (4 mL, 50 mmol), bis(triphenylphosphine)palladium(II) chloride (86 mg, 0.12 mmol) was added. The reaction mixture was stirred at room temperature for 70 hours. The reaction was quenched with saturated aq. NH4Cl, then extracted with methylene chloride. The combined organic layers were dried over MgSO4, then concentrated. The residue was purified on silica gel (eluting with 0 to 30% EtOAc in hexanes) to give the desired product (630 mg, 94%).
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