2-Bromopropane → HCID 86654668, Verbindung

Reaktionsgleichung

[H-].[Na+].[I:3][C:4]1[CH:5]=[C:6]([CH:9]=[O:10])[NH:7][CH:8]=1.Br[CH:12]([CH3:14])[CH3:13]>CN(C)C=O>[I:3][C:4]1[CH:5]=[C:6]([CH:9]=[O:10])[N:7]([CH:12]([CH3:14])[CH3:13])[CH:8]=1

Komponenten

Versuchsvorschrift

Sodium hydride (860 mg, 55% in mineral oil, 19.7 mmol) was added to a solution of 4-iodo-pyrrole-2-carbaldehyde (3.0 g, 13.2 mmol) in dry dimethylformamide at ambient temperature under a nitrogen atmosphere. After stirring for 15 min 2-bromopropane (3.87 mL, 40.9 mmol) was added and the reaction mixture heated at reflux for 16 h. The mixture was allowed to cool to ambient temperature, quenched with water and extracted with diethyl ether. The combined organic layers were washed with water, brine, dried over anhydrous sodium sulfate and concentrated in vacuo to give a crude residue. Purification by column chromatography over silica gel (60-120 mesh) using 2% ethyl acetate in petroleum ether afforded 4-iodo-1-isopropyl-pyrrole-2-carbaldehyde (1.5 g, 43%) as a brown liquid.