1: malonic acid ethyl ester monopotassium salt With triethylamine; magnesium chloride in acetonitrile T=0 - 20°C; 2.5 h; Inert atmosphere; 2: 2-bromo-3-methylbenzyl acid chloride in acetonitrile T=20°C; 3: With sulfuric acid; acetic acid in water 3 h; Reflux;