Potassium Cyanide → HCID 68940385, Verbindung
Reaktionsgleichung
[CH3:1][O:2][C:3](=[O:12])[CH2:4][C:5]1[S:6][CH:7]=[C:8]([CH2:10]Cl)[CH:9]=1.[C-:13]#[N:14].[K+]>CN(C=O)C>[CH3:1][O:2][C:3](=[O:12])[CH2:4][C:5]1[S:6][CH:7]=[C:8]([CH2:10][C:13]#[N:14])[CH:9]=1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Reaktionsbedingungen
- Temperatur
- 50 °C
Versuchsvorschrift
A solution of (4-chloromethyl-thiophen-2-yl)-acetic acid methyl ester (0.58 g, 2.83 mmol) and potassium cyanide (0.39 g, 5.95 mmol) in DMF (15 mL) is stirred at room temperature for 14 h then heated to 50° C. for 0.5 h. The mixture is quenched with saturated aq NaCl and extracted with CHCl3 (3×). The combined organic layers are washed with saturated aq NaCl, dried over Na2SO4, filtered and concentrated in vacuo. The residue is purified by chromatography (silica gel, 10% ethyl acetate in heptane) to give (4-cyanomethyl-thiophen-2-yl)-acetic acid methyl ester (0.43 g, 78%) as a colorless oil: 1H NMR (CDCl3, 300 MHz) δ 7.10 (s, 1 H), 6.95 (s, 1 H), 3.80 (s, 2 H), 3.72 (s, 3 H), 3.65 (s, 2 H).