1: 2-fluoro-5-methoxybenzoic acid With potassium tert-butylate in tetrahydrofuran; hexane T=-78°C; 0.666667 h; 2: methyl iodide in tetrahydrofuran; hexane T=-78 - 20°C; 1.16667 h; 3: With ammonium chloride in tetrahydrofuran; hexane; water Saturated solution;

water; hydrogen bromide; acetic acid T=140°C;