Trifluoroacetic acid → Ethyl 7-[4-(aminomethyl)benzyloxy]-4-chloro-1-methyl-2-indolecarboxylate

HRID 565058Notes

Reaction equation

C(OC([NH:8][CH2:9][C:10]1[CH:33]=[CH:32][C:13]([CH2:14][O:15][C:16]2[CH:17]=[CH:18][C:19]([Cl:31])=[C:20]3[C:24]=2[N:23]([CH3:25])[C:22]([C:26]([O:28][CH2:29][CH3:30])=[O:27])=[CH:21]3)=[CH:12][CH:11]=1)=O)(C)(C)C.FC(F)(F)C(O)=O>ClCCl>[NH2:8][CH2:9][C:10]1[CH:33]=[CH:32][C:13]([CH2:14][O:15][C:16]2[CH:17]=[CH:18][C:19]([Cl:31])=[C:20]3[C:24]=2[N:23]([CH3:25])[C:22]([C:26]([O:28][CH2:29][CH3:30])=[O:27])=[CH:21]3)=[CH:12][CH:11]=1

Participants

Conditions

Temperature: 0 °C

Procedure

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.

Workup

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

Sources & evidence

ORD record: ord-b4304aaba68c46d7a0dceca3739f42b7
Source dataset: uspto-grants-2001_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06169107A

Reaction notes

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