Many primary amides are commercially available but the list of commercially available secondary amides is much smaller.
This paper describes the transamidation of primary amides with secondary amines. There is no requirement for an expensive transition metal or even a rare earth based catalyst but rather hydroxylamine hydrochloride is used as catalyst.
There are 20 examples listed with yields generally 71-91%. The reaction tolerates phenolic, hydroxy, akene, and alkyne groups are all tolerated along with Boc groups. One other advantage of this method is that it allows formamide to be used to formylate amines.
C.L. Allen,* B.N. Atkinson, and J.M.J. Williams, Angew. Chem. Int. Ed., 2012, 51, 1383-1386.