hydrogen; palladium on activated charcoal in methanol T=20°C; 3 h;

1: With dimethylsulfide borane complex in tetrahydrofuran T=0 - 20°C; 4 h; Heating / reflux; 2: With hydrogenchloride in tetrahydrofuran; water T=20°C; 2.5 h; Heating / reflux; 3: With sodium hydroxide in tetrahydrofuran; water T=0°C;