Hydrochloric Acid → 4-(benzyloxy)-1H-indole-2-carboxylic acid
Reaction equation
[CH2:1]([O:8][C:9]1[CH:17]=[CH:16][CH:15]=[C:14]2[C:10]=1[CH:11]=[C:12]([C:18]([O:20]CC)=[O:19])[NH:13]2)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[OH-].[K+].Cl>O1CCOCC1.O>[CH2:1]([O:8][C:9]1[CH:17]=[CH:16][CH:15]=[C:14]2[C:10]=1[CH:11]=[C:12]([C:18]([OH:20])=[O:19])[NH:13]2)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1Participants
Procedure
Ethyl 4-benzyloxyindol-2-carboxylate (10 g) was dissolved in a mixed solvent (200 ml) of dioxane-water (1:1) and potassium hydroxide (3.8 g) was added. The mixture was refluxed under heating for 2 hr. The reaction mixture was poured into ice water, made acidic with hydrochloric acid and extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure to give 4-benzyloxyindol-2-carboxylic acid as pale-yellow crystals (9.0 g). The crystals were dissolved in dimethylformamide (100 ml) and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (WSC, 7.6 g), 1-hydroxybenzotriazole hydrochloride (HOBt, 6.9 g), triethylamine (7.0 ml) and acetohydrazine (2.6 g) were added thereto. The mixture was stirred at room temperature for 6 hr. The reaction mixture was poured into ice water and the precipitated crystals were collected by filtration to give the title compound (10 g).
Workup
- additionwas added
- temperatureThe mixture was refluxed
- temperatureunder heating for 2 hr
- extractionextracted with ethyl acetate
- washThe organic layer was washed with brine
- dry with materialdried over anhydrous sodium sulfate
- concentrationconcentrated under reduced pressure
Sources & evidence
- ORD record
- ord-cdefe2a118ef4fc88a339cd62fa037d0
- Source dataset
- uspto-grants-2004_04
- Patent number
- US06720320B2
Reaction notes
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