1: With dimethylsulfide borane complex in tetrahydrofuran T=0°C; Heating / reflux; 2: With hydrogenchloride; water in tetrahydrofuran; methanol T=0°C; 3 h; Heating / reflux; 3: With sodium hydroxide in tetrahydrofuran; methanol; water pH=> 9;

potassium carbonate in tetrahydrofuran; water T=20°C;