SYNTHESIS OF EPOXYISOINDOLO[1,2-A]ISOQUINOLINIUM SALTS BY AN INTRAMOLECULAR [2+4] CYCLOADDITION REACTION IN 2-ALLYL-1-FURYLISOQUINOLINIUM HALIDES СтатьяZubkov F.I., Zaytsev V.P., Obushak M.D., Ershova Y.D., Mertsalov D.F., Sorokina E.A., Nikitina E.V., Gorak Y.I., Lytvyn R.Z., Varlamov A.V.Chemistry of Heterocyclic Compounds. Том 49. 2013. С. 746-759