Cl[C:2]1[CH:7]=[CH:6][C:5]([N:8]2[CH:12]=[C:11]([C:13]#[C:14][Si:15]([CH3:18])([CH3:17])[CH3:16])[N:10]=[C:9]2[CH3:19])=[CH:4][N:3]=1.C(=O)(O)[O-].[Na+].[Cl-].[CH:26]1([Zn+])[CH2:28][CH2:27]1>C1COCC1>[CH:26]1([C:2]2[CH:7]=[CH:6][C:5]([N:8]3[CH:12]=[C:11]([C:13]#[C:14][Si:15]([CH3:18])([CH3:17])[CH3:16])[N:10]=[C:9]3[CH3:19])=[CH:4][N:3]=2)[CH2:28][CH2:27]12-Chloro-5-(2-methyl-4-trimethylsilanylethynyl-imidazol-1-yl)-pyridine (425 mg, 1.47 mmol) were dissolved in 0.4M cyclopropylzinc chloride in THF (7.33 mL, 0.4M in THF) and tetrakis(triphenylphosphin)palladium (34 mg, 0.03 mmol) were added. The reaction mixture was refluxed for 16 hrs and poured into 50 mL sat. sodium bicarbonate solution. The mixture and extracted three times with ethyl acetate (50 mL each). The combined organic extracts were dried with magnesium sulfate, filtered and evaporated. The crude product was purified by flash chromatography on silica gel (heptane/ethyl acetate 100:0->1:1 gradient) and the desired product was obtained as a light yellow solid (395 mg, 91%), MS: m/e=296.2 (M+H+).
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