1: N,N-dimethylamino-1,1,2,2-tetrafluoroethane With boron trifluoride diethyl etherate in 1,4-dioxane; diethyl ether T=0 - 5°C; Inert atmosphere; 2: ethyl 3-(pyrrolidin-1-yl)acrylate With pyridine in 1,4-dioxane; diethyl ether T=0 - 5°C; 3: methylhydrazine

phenyl isocyanate; triethylamine in benzene

1: N,N-dimethylamino-1,1,2,2-tetrafluoroethane With boron trifluoride diethyl etherate in 1,4-dioxane; diethyl ether T=0 - 5°C; Inert atmosphere; 2: ethyl 3-(pyrrolidin-1-yl)acrylate With pyridine in 1,4-dioxane; diethyl ether T=0 - 5°C; 3: methylhydrazine