1: With lithium borohydride in tetrahydrofuran; methanol T=30°C; 2 h; 2: With formic acid; ammonium formate; palladium 10 on activated carbon in tetrahydrofuran; methanol 48 h; 3: With hydrogen; sodium hydrogencarbonate; acetic acid; palladium 10 on activated carbon Product distribution / selectivity; more than 3 stages;