1: malonic acid ethyl ester monopotassium salt With magnesium chloride in acetonitrile T=35°C; 0.75 h; 2: With triethylamine in acetonitrile T=25°C; 0.5 h; 3: 1-(3-fluorobenzoyl) imidazole With hydrogenchloride; water more than 3 stages;

in ethanol; water T=20°C; 6.16667 h;