The synthesis of novel polycyclic heterocyclic ring systems via photocyclization. 2 . Benzo[h][1]benzothieno[2,3‐c]quinoline and benzo[h][1]benzothieno[2,3‐c]quinoline

Abstract The synthesis of two previously unknown unsubstituted heterocyclic ring systems namely, benzo[h][1]benzothieno[2,3‐c]quinoline (6) and benzo[f][1]benzothieno[2,3‐c]quinoline (12) is reported. These two novel ring systems have been assembled by photocyclization of the appropriate amides.