Heterocyclic Amines When naming a cyclic amine the nitrogen is assigned position number 1. H— H CH3 H aziridine pyrrole pyrrolidine 1-methylpyrrolidine imidazole indole (N-methylpyrrolidine) CH3 H pyridine 2-methylpyridine piperidine pyrimidine purine Copyright2010 Pearson Prentice Hall,Inc. Chapter 19 10 Chapter 19 10 Heterocyclic Amines When naming a cyclic amine the nitrogen is assigned position number 1