1: With methanol; sodium hydroxide; water T=60°C; 3 h; 2: With hydrogenchloride in methanol; diethyl ether; water T=20°C; 0.5 h; 3: With acetic anhydride 4 h; Heating / reflux; Product distribution / selectivity;

Product distribution / selectivity;

1: in 1-methyl-pyrrolidin-2-one T=20°C; 4 h; 2: With dicyclohexyl-carbodiimide in 1-methyl-pyrrolidin-2-one T=5 - 20°C; 4 h;

1: in 1-methyl-pyrrolidin-2-one T=20°C; 3 h; 2: With dicyclohexyl-carbodiimide in 1-methyl-pyrrolidin-2-one T=5 - 20°C; 4 h;