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A mixture of 0.75 g (1.59 mmol) of ethyl 7-[4-(tert-butoxycarbonylaminomethyl)benzyloxy]-4-chloro-1-methyl-2-indolecarboxylate, 5 ml of trifluoroacetic acid and 50 ml of dichloromethane was stirred at 0° C. for 2 hours. The reaction mixture was concentrated under reduced pressure. Thereafter ice water was poured onto the resulting residue and 28% aqueous ammonia was added thereto to render alkaline (pH=9 to 10). The mixture was then extracted three times with ethyl acetate. The combined extracts were washed with saturated sodium chloride solution. After drying over anhydrous magnesium sulfate, the solvent was distilled off under reduced pressure to give 0.60 g (>99%) of ethyl 7-[4-(aminomethyl)benzyloxy]-4-chloro-1-methyl-2-indolecarboxylate.

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. additionThereafter ice water was poured onto the resulting residue and 28% aqueous ammonia
3. additionwas added
4. extractionThe mixture was then extracted three times with ethyl acetate
5. washThe combined extracts were washed with saturated sodium chloride solution
6. dry with materialAfter drying over anhydrous magnesium sulfate
7. distillationthe solvent was distilled off under reduced pressure