[CH3:1][Si:2]([C:5]#[CH:6])([CH3:4])[CH3:3].[CH3:7][O:8][C:9](=[O:22])[CH2:10][C:11]1[C:20]2[C:15](=[CH:16][CH:17]=[C:18](Br)[CH:19]=2)[CH:14]=[N:13][CH:12]=1>CN(C=O)C.C(N(CC)CC)C.C(OCC)(=O)C.[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>[CH3:7][O:8][C:9](=[O:22])[CH2:10][C:11]1[C:20]2[C:15](=[CH:16][CH:17]=[C:18]([C:6]#[C:5][Si:2]([CH3:4])([CH3:3])[CH3:1])[CH:19]=2)[CH:14]=[N:13][CH:12]=1Trimethylsilylacetylene (0.17 ml, 1.23 mmol) is added to a suspension of (6-bromo-isoquinolin-4-yl)-acetic acid methyl ester (0.325 g, 1.03 mmol) in DMF (1.75 ml) and triethylamine (10 ml), follwed by copper(I) iodide (40 mg, 0.20 mmol) and (Ph3P)2PdCl2 (73 mg, 0.10 mmol). The reaction is heated at 45° C. for 40 minutes, cooled to ambient temperature and diluted with ethyl acetate. After washing with water and brine, the organic phase is dried over magnesium sulfate, evaporated and purified by flash column chromatography (1:1 ethyl acetate-hexane elution) to afford (6-trimethylsilanylethynyl-isoquinolin-4-yl)-acetic acid methyl ester, [MH]+ 298. This intermediate (0.221 g, 0.74 mmol) is dissolved in methanol (7.5 ml) and treated with potassium carbonate (75 mg, 0.54 mmol). The reaction is stirred for 30 minutes at ambient temperature, evaporated and purified by flash chromatography (5:1 dichloromethane-methanol elution) to afford (6-ethynyl-isoquinolin-4-yl)-acetic acid, [MH]+ 212.
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