4-Chlorobenzonitrile → (Z)-1-(4-chlorophenyl)-2-(thiazol-2-yl)ethenamine

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A 2.5M solution of N-butyllithium (8.00 mL, 20.00 mmol) in hexanes, was added dropwise to 2-methylthiazole (1.983 g, 20 mmol) dissolved in THF (35.00 mL) over a period of 5 minutes under argon at −70° C. The resulting pale yellow slurry was stirred at −70° C. for 2.5 hour. 4-chlorobenzonitrile (2.75 g, 20.00 mmol) in THF (35.00 mL) was added dropwise to the suspension, which was stirred at −70° C. for 90 minutes after the end of the addition. The reaction mixture was allowed to warm to room temperature under stirring and darkened. The crude was concentrated to dryness and diluted with ethyl acetate then washed with water, dried over magnesium sulphate and concentrated. The crude product was purified by flash chromatography on silica gel eluting with 10 to 100% ethyl acetate in dichloromethane. The solvent was evaporated to dryness to afford (Z)-1-(4-chlorophenyl)-2-(thiazol-2-yl)ethenamine (1.466 g, 31.0%) as a pale yellow solid.

Herkunft & Nachweise