[C:1]([O:5][C:6](=[O:26])[CH2:7][N:8]1[C:16]2[C:11](=[CH:12][CH:13]=[C:14]([O:17][Si](C(C)(C)C)(C)C)[CH:15]=2)[C:10]([Cl:25])=[CH:9]1)([CH3:4])([CH3:3])[CH3:2].O.[F-].C([N+](CCCC)(CCCC)CCCC)CCC>>[C:1]([O:5][C:6](=[O:26])[CH2:7][N:8]1[C:16]2[C:11](=[CH:12][CH:13]=[C:14]([OH:17])[CH:15]=2)[C:10]([Cl:25])=[CH:9]1)([CH3:4])([CH3:2])[CH3:3]In analogy to the procedure described in example 3 b], [6-(tert-butyl-dimethyl-silanyloxy)-3-chloro-indol-1-yl]-acetic acid tert-butyl ester was treated with tetrabutylammonium fluoride hydrate to obtain (3-chloro-6-hydroxy-indol-1-yl)-acetic acid tert-butyl ester as colorless gum.
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