Carbon Dioxide → 5-methyl-1H-indole-7-carboxylic acid

HRID 855280

Reaktionsgleichung

Br[C:2]1[CH:3]=[C:4]([CH3:11])[CH:5]=[C:6]2[C:10]=1[NH:9][CH:8]=[CH:7]2.[Li]CCCC.[C:17](=[O:19])=[O:18].O>C1COCC1.CCCCCC>[CH3:11][C:4]1[CH:5]=[C:6]2[C:10](=[C:2]([C:17]([OH:19])=[O:18])[CH:3]=1)[NH:9][CH:8]=[CH:7]2

Komponenten

Reaktionsbedingungen

Temperatur: 2.5 °C

Versuchsvorschrift

1.68 g of 7-bromo-5-methyl-indole (8 mmol) were dissolved in 30 ml THF and 15 ml of a 1.6 molar solution of n-BuLi in hexane were added at −78° C. The reaction mixture was then allowed to warm to 0-5° C. and was stirred at this temperature for 30 min. Then it was cooled again to −78° C., dry ice was added and the mixture was allowed to warm to rt. After 15 min at rt it was poured into water and extracted twice with ether. The aqueous phase was then acidified with 1 N HCl solution and extracted several times with DCM. The combined DCM extracts were then washed with brine, dried with magnesium sulfate, filtered and the solvent was evaporated. The remaining residue was triturated with n-hexane. Final filtration yielded 0.78 g (56%) of 5-methyl-1H-indole-7-carboxylic acid as light brown solid. 1H NMR (DMSO-d, 300 MHz): δ 2.41 (s, 3H), 6.44 (m, 1H), 7.31 (m, 1H), 7.58 (s, 1H), 7.61 (s, 1H), 10.91 (br s, 1H), 12.92 (br s, 1H).

Aufarbeitung

temperatureThen it was cooled again to −78° C.
temperatureto warm to rt
extractionextracted twice with ether
extractionextracted several times with DCM
washThe combined DCM extracts were then washed with brine
dry with materialdried with magnesium sulfate
filtrationfiltered
customthe solvent was evaporated
customThe remaining residue was triturated with n-hexane
filtrationFinal filtration

Quellen und Nachweise

ORD-Eintrag: ord-5721f061e67e4ef3ada7bb121c21c9a0
Quelldatensatz: uspto-grants-2007_08
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US07259183B2

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