1: benzenecarboximidamide hydrochloride With sodium methylate in ethanol T=20°C; 5 h; 2: 2-cyano-4,4-diethoxy-butyric acid ethyl ester in ethanol 5 h; Heating / reflux; 3: With acetic acid in ethanol; water T=0°C; pH=7;

trichlorophosphate 5 h; Heating / reflux;