1: With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.0833333 h; 2: With di-tert-butylazodicarboxylate in tetrahydrofuran; hexane T=-78 - 20°C; 0.5 h; 3: With hydrogenchloride in tetrahydrofuran; 1,4-dioxane; hexane T=100°C; 0.0833333 h;