HCID 81430592, Verbindung → Methyl 3-bromo-5-cyanobenzoate
Reaktionsgleichung
[Br:1][C:2]1[CH:3]=[C:4]([CH:9]=[C:10]([C:12](=O)[NH2:13])[CH:11]=1)[C:5]([O:7][CH3:8])=[O:6]>O=P(Cl)(Cl)Cl>[Br:1][C:2]1[CH:3]=[C:4]([CH:9]=[C:10]([C:12]#[N:13])[CH:11]=1)[C:5]([O:7][CH3:8])=[O:6]Komponenten
3
Edukt 1
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Reaktionsbedingungen
- Temperatur
- 100 °C
Versuchsvorschrift
To methyl 3-bromo-5-carbamoyl-benzoate (2.8 g, 10.8 mmol, 1.0 eq) was added POCl3 (30 mL) and the reaction heated at 100° C. overnight. The POCl3 was removed under reduced pressure, water was added and the aqueous layer extracted with EtOAc. The combined organic extracts were dried (Na2SO4), filtered and evaporated in vacuo to afford a crude residue which was purified by column chromatography (petroleum ether:EtOAc, 20:1) to give methyl 3-bromo-5-cyano-benzoate (2.5 g, 96%). This material was dissolved in THF (30 mL) and LiOH.H2O (1.7 g, 41.6 mmol, 1.54 eq) and H2O (10 mL) were added. The mixture was stirred at room temperature overnight. The THF was removed under reduced pressure and the aqueous phase acidified with diluted HCl and extracted with EtOAc. The combined organic extracts were dried (Na2SO4), filtered and evaporated in vacuo. The residue obtained was purified by column chromatography (CH2Cl2: MeOH, 50:1) to give the title compound as a white solid (2 g, 85%).