T=190°C; 6 h;

dicyclohexyl-carbodiimide in 1,4-dioxane 1.) reflux, 1h, 2.) standing r.t, overnight;

in 1,4-dioxane 1 h; Heating;

1: sodium acetate, hydroxylaminehydrochloride / ethanol; H2O / 1.) reflux, 0.5h, 2.) standing overnight in the refrigerator 2: 60 percent / dicyclohexylcarbodiimide (DCC) / dioxane / 1.) reflux, 1h, 2.) standing r.t, overnight View Scheme

pyridine