Abstract Ammoniomethyl trifluoroborates are very powerful reagents that can be used to access biologically relevant aryl-and heteroaryl-methylamine motifs via Suzuki–Miyaura cross-couplings. Until now, this method was limited to the production of tertiary and primary amines. The synthesis of a large array of secondary ammoniomethyltrifluoroborates has been achieved through a one step nucleophilic substitution reaction on the potassium ...