Hydrazine hydrate (1:1) → N-{1-[3-(4-Nitrophenyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]ethyl}acetamide

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

7.30 g (7.09 ml, 145.82 mmol) of hydrazine hydrate are added dropwise to 24.50 g (121.5 mmol) of 4-nitrobenzenecarboximidamide hydrochloride from example 1A are in 250 ml of ethanol. The mixture is stirred for one hour at 20° C. After this time, 34.12 g (182.28 mmol) of ethyl 3-(acetylamino)-2-oxobutanoate from example 4A are added in ethanol, and the reaction mixture is stirred for 4 h at a bath temperature of 70–80° C., subsequently for 12 h at 20° C. The mixture is concentrated and the residue is purified by flash chromatography (eluent: ethyl acetate, subsequently dichloromethane/methanol 30:1).

Herkunft & Nachweise