1: pyridine-2-carboxylic acid pentafluorophenyl ester With palladium diacetate; 1,2-bis-(diphenylphosphino)ethane in toluene T=115°C; 0.166667 h; 2: 4-nitrobenzaldehdye With tert.-butylhydroperoxide in toluene 48 h; Reflux;

dicyclohexyl-carbodiimide in 1,4-dioxane Ambient temperature;

1.1: 4-(N,N-dimethlyamino)pyridine; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride / tetrahydrofuran / 25 °C 2.1: palladium diacetate; 1,2-bis-(diphenylphosphino)ethane / toluene / 0.17 h / 115 °C 2.2: 48 h / |Reflux View Scheme

hydrazine in N,N-dimethyl-formamide Ambient temperature;

in N,N-dimethyl-formamide Ambient temperature;