Further studies on heterocyclic arene imines. Preparation of 1a,9b‐dihydroazirino[ f ][1,7]phenanthroline, 3b,4a‐dihydroazirino‐[2,3]phenaleno[1,9‐ g,h ]quinoline and 1a,13b‐dihydrodibenzo[1,2:6,7]phenazino[1,2‐ b ]azirine

The syntheses of the K‐imine derivatives of 1,7‐phenanthroline, phenaleno[1,9‐ g,h ]quinoline, and dibenzo[ a,h ]phenazine are described. The parent heterocyclic compounds 4, 9 and 14 were oxidized to the corresponding K‐oxides, 5, 10 and 15 , which in turn were reacted with sodium azide in aqueous acetone. The resulting trans ‐azido alcohols were then cyclized with tributylphosphine to the title compounds 6, 11 and 16 .