pyridine-2-carbaldehyde; boron trifluoride diethyl etherate in 1,2-dichloro-ethane T=50°C; 12 h; Inert atmosphere;

1: With anhydrous copper acetate in methanol T=28°C; 6 h; Inert atmosphere; 2: With hydrogenchloride in methanol 6 h; Inert atmosphereReflux;

1: With boron trifluoride diethyl etherate; 4-dimethylamino-benzaldehyde in 1,2-dichloro-ethane T=50°C; 12 h; Inert atmosphere; 2: With 2,3-dicyano-5,6-dichloro-p-benzoquinone in 1,4-dioxane 36 h; Inert atmosphereReflux; Reagent/catalyst;

sodium hydroxide in methanol T=20°C; 1 h;