[F:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[NH:7][CH:6]=[CH:5]2.[H-].[Na+].[C:13]([Si:17](Cl)([CH3:19])[CH3:18])([CH3:16])([CH3:15])[CH3:14].O>C1COCC1>[C:13]([Si:17]([CH3:19])([CH3:18])[N:7]1[C:8]2[C:4](=[CH:3][C:2]([F:1])=[CH:10][CH:9]=2)[CH:5]=[CH:6]1)([CH3:16])([CH3:15])[CH3:14]To a solution of 5-fluoro-1H-indole (30.0 g, 0.222 mol) in anhydrous THF (250 mL) was added sodium hydride (60% suspension in mineral oil, 10.22 g, 0.255 mol) portionwise and maintaining the solution at 0° C. The reaction mixture was stirred at 0° C. for 20 min, then a solution of tert-butyl-chloro-dimethyl-silane (40.15 g, 0.266 mol) in anhydrous THF (20 mL) was added and the solution stirred at RT for 25 h. The reaction mixture was poured into H2O and the layers separated. The aqueous layer was extracted with EtOAc and the combined organic layers were dried (MgSO4), then concentrated in vacuo. The resultant residue was purified by column chromatography (silica gel, cyclohexane:DCM 100% to 50:50) to provide the title compound as a colourless oil (41.2 g, 74%).
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