1: With sodium tetrahydroborate; boron trifluoride diethyl etherate in tetrahydrofuran T=-10 - 20°C; 2 h; 2: With hydrogenchloride in tetrahydrofuran; methanol; water T=0 - 40°C; 1 h; 3: With hydrogen; palladium-on-charcoal in methanol 12 h;