1: 3-fluoro-5-methoxybenzoic acid With thionyl chloride in toluene 2 h; Reflux; 2: With O,N-dimethyl-hydroxylamine hydrochloride; triethylamine in dichloromethane; toluene T=0 - 20°C; 3: methylmagnesium bromide in diethyl ether T=20°C; 2 h; RefluxInert atmosphere;