[NH:1]1[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[CH:3]([C:10](OCC)=[O:11])[CH2:2]1.[H-].[Al+3].[Li+].[H-].[H-].[H-].O>C1COCC1>[NH:1]1[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[CH:3]([CH2:10][OH:11])[CH2:2]10.79 g (3.5 mmol) ethyl 2,3-dihydro-1H-indol-3-carboxylate were added batchwise at RT to 7.8 mL (7.8 mmol) of a 1 M lithium aluminium hydride solution (in THF) in 40 mL THF and refluxed for 1 h. Then the reaction mixture was combined with water while being cooled, the precipitate formed was filtered off and the filtrate was evaporated down.
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