[Si:1]([O:8][CH2:9][CH2:10][CH2:11][N:12]1[C:20]2[C:15](=[C:16]([CH2:21][C:22]#[N:23])[CH:17]=[CH:18][CH:19]=2)[CH:14]=[CH:13]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].CC([OH:28])(C)C.[OH-].[K+]>C(OCC)(=O)C>[Si:1]([O:8][CH2:9][CH2:10][CH2:11][N:12]1[C:20]2[C:15](=[C:16]([CH2:21][C:22]([NH2:23])=[O:28])[CH:17]=[CH:18][CH:19]=2)[CH:14]=[CH:13]1)([C:4]([CH3:5])([CH3:7])[CH3:6])([CH3:3])[CH3:2]Add {1-[3-(tert-Butyldimethylsilyloxy)propyl]-1H-indol-4-yl}acetonitrile (1.9 g, 11.0 mmol) to 2-methyl-2-propanol (20 mL). Heat to reflux under nitrogen and add potassium hydroxide pellets (7.4 g, 132 mmol). Stir and reflux under nitrogen for 30 minutes. Pour solution off of the excess potassium hydroxide and dilute with ethyl acetate. Wash with a 1:1 mixture of aqueous saturated sodium chloride, aqueous saturated sodium hydrogen carbonate. Dry the organic phase over anhydrous magnesium sulfate, filter, and concentrate under reduced pressure. Rinse the solid with cold diethyl ether and dry under vacuum to obtain 1.62 g (77%) of the title compound as an off-white solid. ESMS (M++1): 347.2.
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