1: 2,5-dimethoxy-tetrahydrofuran With hydrogenchloride in water T=0°C; 2: acetone-1,3-dicarboxylic acid; 4-fluorobenzenemethanamine hydrochloride With sodium acetate in water T=20 - 50°C; 3.5 h; 3: With sodium hydroxide in water T=0°C; pH=10;

lithium aluminium tetrahydride in tetrahydrofuran T=0 - 20°C; 3 h;