hydrazine in dichloromethane 0.25 h;

copper diacetate; palladium diacetate in tetrahydrofuran; N,N-dimethyl acetamide T=80°C; 3 h; chemoselective reaction;

dichloro bis(acetonitrile) palladium(II); 1,10-phenanthroline; tetrabutylammomium bromide; copper diacetate; sodium carbonate in 1,4-dioxane; dimethyl sulfoxide T=20 - 100°C; 4.58333 h; Inert atmosphere;