4-(N,N-dimethlyamino)pyridine; 4-N,N-dimethylaminopyridine hydrochloride; diisopropyl-carbodiimide in dichloromethane T=0 - 20°C;

Rb2CO3; [Cu(I)(CH3CN)4]PF6; 3,4,7,8-tetra-methyl-1,10-phenanthroline in ethylene glycol dimethyl ether T=45°C; 12 h;