A new efficient and convergent method has been developed to construct a N-(dialkylamino) azacyclic system as a tetrasubstituted hydrazine via reductive alkylation of the corresponding hydrazone using sodium triacyloxyborohydride [NaBH (OCOR) 3], which is tolerant of various substituents (eg, phenol, conjugated olefin, amide, and thioamide) on the substrate and useful for organization of the N-aminoazacycle array.