Among various 1,3-dipoles of cyclic azomethine imines, C,N-cyclic azomethine imines are the most widely used reagents in the construction of diverse tetrahydroisoquinoline derivatives. The developments of reactions with C,N-cyclic azomethine imines including [3+2], [3+3], [3+4], [5+1], [3+1] cycloaddition reactions and miscellaneous reactions are summarized. The properties of reactions, reaction processes and synthetic applications are discussed. Finally, the pr...