The synthesis of novel polycyclic heterocyclic ring system via photocyclization .18. Benzo[h]naphtho[1',2':4,5]thieno[2,3-c]quinoline and benzo[h]naphtho[1',2':4,5]thieno[2,3-c][1,2,4]triazolo[4,3-a]quinoline

The synthesis of two previously unknown polycyclic ring systems, benzo[h]naphtho[1'2':4,5]thieno[2,3-c]quinoline (1) and benzo[h]naphtho[1',2':4,5]thieno[2,3-c][1,2,4]triazolo[4,3-a]quinoline (2), was achieved via oxidative photocyclization of 1-chloro-N-(1-naphthyl)naphtho[2,1-b]thiophene-2-carboxamide (5). The total assignment of their H-1 and C-13 nmr spectra was determined by the concerted use of two-dimensional nmr methods.