1: bis(trichloromethyl) carbonate; N-Boc-2,2'-(ethylene-1,2-dioxy)bisethylamine With N-ethyl-N,N-diisopropylamine in dichloromethane T=15 - 20°C; 1 h; 2: carbonic acid bis-(4-formyl-2,6-dimethyl-phenyl) ester With 4-(N,N-dimethlyamino)pyridine in dichloromethane T=20°C;