Tetracyclic systems: Synthesis of isoindolo[1,2‐ b ]thieno‐[2,3(3,2 or 3,4)‐ e ][1,3]thiazocines and Isoindolo[2,1‐ a ]thieno‐[2,3(3,2 or 3,4)‐ f ][1,4] and [1,5]diazocines

Cyclization of thioglycolic acids derivatives 3a‐d gave isoindolo[1,2‐ b ]thieno[2,3(3,2 or 3,4)‐ e ][1,3]‐thiazocines 4a‐d . Isoindolo[2,1‐ a ]thieno[2,3(3,2 or 3,4)‐ f ][1,4] or [1,5]diazocines 10b or 11a‐c were synthesized from Beckmann or Schmidt rearrangement of the ketones 7a‐c .