The synthesis of novel polycyclic heterocyclic ring systems via photocyclization. 1. Thieno[3′,2′:4,5]thieno[2,3-c]quinoline and thieno[2′,3′:4,5]thieno[2,3-c]quinoline

The synthesis of two previously unknown heterocyclic ring systems, namely, thieno3′,2′:4,5]thieno2,3-c]-quinoline and thieno2′,3′:4,5]thieno2,3-c]quinoline is reported. These two novel ring systems were assembled by photocyclization of the appropriate anilides.