Synthesis of Tetracyclic Systems: A Convenient Route to [1]Benzothieno [2,3-e]pyrrolo[1,2-a]pyrazine and [1]Benzofuro[2,3-e]pyrrolo[1,2-a]pyrazine Derivatives
Synthesis of Tetracyclic Systems: A Convenient Route to [1]Benzothieno [2,3-e]pyrrolo[1,2-a]pyrazine and [1]Benzofuro[2,3-e]pyrrolo[1,2-a]pyrazine Derivatives