Hydrochloric Acid → 6-chloro-5-(2-fluoro-4-methoxyphenyl)-1H-indole-3-carboxylic acid
Reaction equation
[Cl:1][C:2]1[CH:10]=[C:9]2[C:5]([C:6]([C:11]([O:13]C)=[O:12])=[CH:7][NH:8]2)=[CH:4][C:3]=1[C:15]1[CH:20]=[CH:19][C:18]([O:21][CH3:22])=[CH:17][C:16]=1[F:23].[OH-].[Na+].Cl.C(Cl)Cl>CO.C(OCC)(=O)C>[Cl:1][C:2]1[CH:10]=[C:9]2[C:5]([C:6]([C:11]([OH:13])=[O:12])=[CH:7][NH:8]2)=[CH:4][C:3]=1[C:15]1[CH:20]=[CH:19][C:18]([O:21][CH3:22])=[CH:17][C:16]=1[F:23]Participants
7
Reactant 4
Product 1
Reagents, catalysts & solvents 2
Conditions
- Temperature
- 75 °C
Procedure
A mixture of methyl 6-chloro-5-(2-fluoro-4-methoxyphenyl)-1H-indole-3-carboxylate (50 mg, 0.15 mmol) in methanol (1.5 mL) and aqueous 1M sodium hydroxide (1M, 0.50 mmol, 0.50 mL) was heated at 75° C. for 24 hours. The reaction was then acidified with 1M HCl to pH=2 and diluted with ethyl acetate. The layers were separated and the aqueous layer was back-extracted twice with ethyl acetate. The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo to provide a crude solid. A small amount of methylene chloride was added and the crude material slurried for 5 minutes. The solid was then filtered and washed with ethyl acetate to provide the title compound (13 mg, 27% yield).
Workup
- customThe layers were separated
- extractionthe aqueous layer was back-extracted twice with ethyl acetate
- dry with materialThe combined organic layers were dried over sodium sulfate
- filtrationfiltered
- concentrationconcentrated in vacuo
- customto provide a crude solid
- filtrationThe solid was then filtered
- washwashed with ethyl acetate
Sources & evidence
- ORD record
- ord-683a7df4b7024ecb8c2d40446926a89b
- Source dataset
- uspto-grants-2014_11
- Patent number
- US08889730B2
Reaction notes
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