Indole-7-carboxaldehyde → 7-Ethenyl-1H-indole
Reaction equation
[CH3:1]C(C)([O-])C.[K+].[CH:7]([C:9]1[CH:10]=[CH:11][CH:12]=[C:13]2[C:17]=1[NH:16][CH:15]=[CH:14]2)=O>[Br-].C[P+](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.O1CCCC1.C(OCC)(=O)C>[CH:7]([C:9]1[CH:10]=[CH:11][CH:12]=[C:13]2[C:17]=1[NH:16][CH:15]=[CH:14]2)=[CH2:1]Participants
Procedure
Add potassium tert-butoxide (1 M in tetrahydrofuran, 14.1 mL, 14.1 mmol) to a solution of methyl triphenylphosphonium bromide (5.05 g, 14.1 mmol) in tetrahydrofuran (80 mL) and stir the reaction mixture for 45 minutes at room temperature. Add a solution of 7-formylindole (1.00 g, 6.89 mmol) in tetrahydrofuran (10 mL) and stirred for 1.5 hours. Dilute the reaction mixture with ethyl acetate (250 mL), wash sequentially with an 8:1 mixture of water and 1 N hydrochloric acid (2×100 mL) and saturated aqueous sodium chloride (100 mL), dry over sodium sulfate, filter, and concentrate the filtrate under reduced pressure. Subject the residue silica gel chromatography. Combine fractions containing product and concentrate them under reduced pressure to provide the desired compound as a brown oil.
Workup
- stirringstirred for 1.5 hours
- washwash sequentially with an 8:1 mixture of water and 1 N hydrochloric acid (2×100 mL) and saturated aqueous sodium chloride (100 mL)
- dry with materialdry over sodium sulfate
- filtrationfilter
- concentrationconcentrate the filtrate under reduced pressure
- additionCombine fractions containing product
- concentrationconcentrate them under reduced pressure
Sources & evidence
- ORD record
- ord-26848bd307884ed187f181d62ab4656b
- Source dataset
- uspto-grants-2011_11
- Patent number
- US08058425B2
Reaction notes
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