potassium hydroxide in ethanol T=50 - 60°C; 5 h;

1: With anhydrous lithium acetate in N,N-dimethyl-formamide T=20°C; 16 h; 2: With hydrogenchloride in N,N-dimethyl-formamide T=-45°C; 3: With sodium tetrahydroborate; sodium hydrogencarbonate in methanol; N,N-dimethyl-formamide T=-45 - 20°C;