New synthetic routes for N-substituted 1,n-diamines. II. Synthesis of selectively N-substituted tetra- and pentamethylenediamines from ω-alkanoic acid derivatives

A new approach for the synthesis of selectively N-substituted tetra- and pentamethylenediamines 1 (n = 4,5) is described. The method uses N-substituted ω-haloalkanamides 2 as precursors and involves the microwave-promoted conversion into ω-azidocarboxamides 3 and later the reduction of both azido and carboxamide groups with diborane.