1: With azidopolyethyleneglycol monomethyl ether in toluene T=70°C; 48 h; 2: With formic acid in chloroform 7 h; Heating;

ammonium hydroxide; sodium azide 1.) H2O, dioxane, RT, 36 h; 2.) 50-60 deg C, 3 d; Yield given. Multistep reaction;