Protolytic opening of the furan ring in the synthesis of 5<Emphasis Type="Italic">H</Emphasis>,10<Emphasis Type="Italic">H</Emphasis>-dipyrrolo[1,2-<Emphasis Type="Italic">a</Emphasis>:1',2'-<Emphasis Type="Italic">d</Emphasis>]pyrazines
1. Research Institute of Heterocyclic Compound Chemistry, Kuban State Technological University, 2 Moscow St., Krasnodar, 350072, Russia 2. Perm’ State National Research University, 15 Bukirev St., Perm’, 614990, Russia