1: With copper(l) iodide; 4-toluenesulfonyl azide; triethylamine in acetonitrile T=20°C; 6 h; Inert atmosphere; 2: With sulfuric acid in acetonitrile 4 h; Reflux;

sodium hydrogensulfite in N,N-dimethyl acetamide T=100°C; 2 h;

Heating;