I[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH2:8][C:9]([NH2:11])=[O:10].CCN(CC)CC.[C:19]([Si:21]([CH3:24])([CH3:23])[CH3:22])#[CH:20]>CN(C=O)C.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.[Cu]I>[CH3:22][Si:21]([C:19]#[C:20][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[CH2:8][C:9]([NH2:11])=[O:10])([CH3:24])[CH3:23]
A mixture of 2-(2-iodophenyl)acetamide (I6) (12.91 g, 49.52 mmol), Et3N (26 mL), ethynyltrimethylsilane (9.08 mL, 64.3 mmol), PdCl2(PPh3)2 (0.347 g, 0.495 mmol) and CuI (0.188 g, 0.989 mmol) in DMF (44 mL) was stirred under a nitrogen atmosphere at 50° C. for 3 hours. The volatiles were removed in vacuo and the resulting residue partitioned between EtOAc (100 mL) and water. The aqueous phase was extracted with EtOAc (3×50 mL), then the combined organic extracts were washed with water (3×70 mL), brine, dried (MgSO4), filtered and evaporated in vacuo to give the title compound I7 as a brown solid (11.4 g, 99%); 1H NMR (300 MHz, d6-DMSO) δ 7.40 (d, J=7.5 Hz, 1H), 7.20-7.36 (m, 4H), 6.94 (brs, 1H), 3.58 (s, 2H), 0.24 (s, 9H). LCMS-B: rt 6.884 min; m/z 232 [M+H]+.
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