1: With potassium hydroxide; water in methanol T=0 - 20°C; 18 h; 2: With hydrogenchloride in methanol; water pH=5.5;

1: With acetic anhydride in chloroform T=20 - 40°C; 1 h; 2: With potassium acetate; isopentyl nitrite in chloroform T=20°C; 24 h; Heating / reflux; 3: With hydrogenchloride in methanol; water T=20°C; 18 h;