Methyl iodide → HCID 22610929, Verbindung

Beteiligte Stoffe

Reaktionsschritte

Under a nitrogen atmosphere, while cooling and stirring, a solution of 22.7 g 4,4,4-trifluoro-3-amino-2-butenoic acid ethyl ester is added dropwise to 5.1 g of a sodium hydride dispersion (60%) in 60 ml N-methylpyrrolidine at 0-5° C. and stirred at 22° C. until hydrogen evolution is complete. Then 23.7 g 2-ethoxicarbonylamino-3-fluoro-5-chloropyridine (Example H1) is added and the reaction mixture heated for about 5 hours to 120° C. The mixture is then cooled, 16.7 g methyl iodide is added dropwise and stirring is continued overnight at 22° C. After the reaction mixture has been taken up in ethyl acetate, it is washed with ice water, dried over sodium sulfate, filtered, and concentrated by evaporation. The residue obtained is recrystallized from ethyl acetate/n-hexane. The title compound is obtained with a melting point of 133-134° C.

Herkunft & Nachweise