Ethyl Acetate → ethyl 3-(6-fluoro-5-nitro-1H-indol-2-yl)-3-methylbutanoate

HRID 1964465Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1964465
[NH2:1][C:2]1[CH:7]=[C:6]([F:8])[C:5]([N+:9]([O-:11])=[O:10])=[CH:4][C:3]=1[C:12]#[C:13][C:14]([CH3:22])([CH3:21])[CH2:15][C:16]([O:18][CH2:19][CH3:20])=[O:17].C(OCC)(=O)C>CC#N.Cl[Pd]Cl>[F:8][C:6]1[CH:7]=[C:2]2[C:3]([CH:12]=[C:13]([C:14]([CH3:21])([CH3:22])[CH2:15][C:16]([O:18][CH2:19][CH3:20])=[O:17])[NH:1]2)=[CH:4][C:5]=1[N+:9]([O-:11])=[O:10]

Komponenten

5

Edukt 2

HCID 8857Ethyl AcetateHCID 59129516Ethyl 5-(2-amino-4-fluoro-5-nitrophenyl)-3,3-dimethylpent-4-ynoate

Produkt 1

HCID 59129505ethyl 3-(6-fluoro-5-nitro-1H-indol-2-yl)-3-methylbutanoateAusbeute 100,3 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 24290Palladium ChlorideKatalysatorHCID 6342AcetonitrileLösungsmittel

Versuchsvorschrift

To a mixture of ethyl 5-(2-amino-4-fluoro-5-nitrophenyl)-3,3-dimethylpent-4-ynoate (34.5 g, 0.11 mol) and PdCl2(10.4 g, 58.6 nmol) in CH3CN (350 mL) was heated to reflux for 1.5 hours. The reaction mixture was cooled down to room temperature. Ethyl acetate (300 mL) was added, the precipitate was filtered off and washed with methanol. The filtrate was concentrated under reduced pressure and the residue was purified by column chromatography on silica gel (petroleum ether/ethyl acetate 40:1) to give ethyl 3-(6-fluoro-5-nitro-1H-indol-2-yl)-3-methylbutanoate (34.0 g, 98%) as a deep yellow solid. 1H NMR (300 MHz, CDCl3) δ 10.11 (brs, 1 H), 8.30 (d, J=7.2 Hz, 1 H), 7.14 (d, J=11.7 Hz, 1 H), 6.35 (d, J=1.5 Hz, 1 H), 4.17 (q, J=7.2 Hz, 2 H), 2.69 (s, 2 H), 1.51 (s, 6 H), 1.25 (t, J=7.2 Hz, 3 H).

Aufarbeitung

  1. temperaturewas heated
  2. temperatureto reflux for 1.5 hours
  3. filtrationthe precipitate was filtered off
  4. washwashed with methanol
  5. concentrationThe filtrate was concentrated under reduced pressure
  6. customthe residue was purified by column chromatography on silica gel (petroleum ether/ethyl acetate 40:1)

Quellen und Nachweise

ORD-Eintrag
ord-d62dc80428934a40af7eadecc2e21ce7
Quelldatensatz
uspto-grants-2013_04
Patentnummer
US08415387B2

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