N-Amino-1,8-naphthalimide was used as a protectinggroup and a reagent to selective synthesis of various mono-N-substituted hydrazines and hydrazides. In all these reactions, the protecting reagent N-amino-1,8-naphthalimide was easily regenerated in good yields by the hydrazinolysis. All these transformations showed good functional-group tolerance and can be used for large scale C−N cross-coupling