1: (3-methoxyphenyl)acetoaldehyde With sodium hydride in tetrahydrofuran T=-5 - 0°C; 0.5 h; Inert atmosphere; 2: ethyl-α,α,α-trifluoroacetate in tetrahydrofuran T=-5 - 20°C; Claisen condensation; 6 h; Inert atmosphere; 3: With hydrogenchloride in water pH=6; Cooling with ice;