Monoimine Derived from <i>trans</i>-1,2-Diaminocyclohexane and Ethyl Glyoxylate: An Intermediate in Aza-Diels–Alder and Mannich Reactions

Novel enantiopure policyclic nitrogen heterocycles have been obtained in the diastereoselective <i>aza</i>-Diels–Alder or Mannich reaction of dienes with imine formed <i>in situ</i> from ethyl glyoxylate and (1<i>R</i>,2<i>R</i>)-diaminocyclohexane.