[CH3:1][Mg+].[Br-].CC[O:6][CH2:7][CH3:8].C(OC([C:14]1[N:15]([CH3:25])[C:16]([C:19]#[C:20][Si:21]([CH3:24])([CH3:23])[CH3:22])=[CH:17][N:18]=1)=O)C.O>C1COCC1>[CH3:25][N:15]1[C:16]([C:19]#[C:20][Si:21]([CH3:22])([CH3:24])[CH3:23])=[CH:17][N:18]=[C:14]1[C:7]([OH:6])([CH3:8])[CH3:1]A solution of 0.67 mL of 3M MeMgBr in ether (2.0 mmol) was added to a stirring 0° C. solution of 200 mg of 1-methyl-5-trimethylsilanylethynyl-1H-imidazole-2-carboxylic acid ethyl ester (0.80 mmol) in 5 mL of THF over 15 min. The mixture was allowed to warm to rt and stirred overnight. Water (20 mL) was added and the mixture was extracted with EtOAc (3×100 mL). The combined extracts were washed with brine and dried with MgSO4, filtered, concentrated and chromatographed (10–100 EtOAc in hexanes) to give 2-(1-methyl-5-trimethylsilanylethynyl-1H-imidazol-2-yl)-propan-2-ol as a yellow oil (110 mg).
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