Chlorosuccinimide → 3-chloro-1H-indole-4-carbonitrile

HRID 475169Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 475169
[NH:1]1[C:9]2[CH:8]=[CH:7][CH:6]=[C:5]([C:10]#[N:11])[C:4]=2[CH:3]=[CH:2]1.C1C(=O)N([Cl:19])C(=O)C1>CN(C=O)C.CCOC(C)=O>[Cl:19][C:3]1[C:4]2[C:5]([C:10]#[N:11])=[CH:6][CH:7]=[CH:8][C:9]=2[NH:1][CH:2]=1

Komponenten

5

Edukt 2

HCID 31398ChlorosuccinimideHCID 38176024-Cyanoindole

Produkt 1

HCID 866947173-chloro-1H-indole-4-carbonitrileAusbeute 98,8 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 6228DimethylformamideLösungsmittel2×HCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

To 1H-indole-4-carbonitrile (514.0 mg, 3.61 mmol) in anhydrous DMF (2.8 mL) at 0° C. was added dropwise NCS (517.3 mg, 3.80 mmol) dissolved in DMF (8.5 mL). The reaction mixture was slowly warmed to RT. After stirring for 20 h, the mixture was diluted with EtOAc. The organic layer was washed with satd. aq. NaHCO3 solution, water and brine, dried (Na2SO4), filtered and concentrated in vacuo. The crude residue was purified by SiO2 chromatography eluting with heptane:EtOAc to afford 3-chloro-1H-indole-4-carbonitrile as a white solid (630 mg, 98.7%). MS (ESI) m/z: 177.1 [M+1]+. 1H NMR (400 MHz, DMSO) 11.99 (br s, 1H), 7.80 (d, J=2.8 Hz, 1H), 7.78 (d, J=8.2 Hz, 1H), 7.61 (d, J=7.2 Hz, 1H), 7.37-7.26 (m, 1H).

Aufarbeitung

  1. washThe organic layer was washed with satd
  2. dry with materialaq. NaHCO3 solution, water and brine, dried (Na2SO4)
  3. filtrationfiltered
  4. concentrationconcentrated in vacuo
  5. customThe crude residue was purified by SiO2 chromatography
  6. washeluting with heptane

Quellen und Nachweise

ORD-Eintrag
ord-73686851b2e746c7b6caa89d50517e00
Quelldatensatz
uspto-grants-2014_01
Patentnummer
US08637537B2

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