The direct amidation of carboxylicacids with N-substituted formamides has been accomplished via ruthenium catalysis. In the presence of ruthenium catalyst, a versatile range of carboxylicacids and N-substituted formamides undergoes amidation reaction to produce synthetically useful amides in good yields. CO in amide product came from benzoic acid but not N-substituted formamides, and which was confirmed