SYNTHESIS OF EPOXYISOINDOLO[1,2-A]ISOQUINOLINIUM SALTS BY AN INTRAMOLECULAR [2+4] CYCLOADDITION REACTION IN 2-ALLYL-1-FURYLISOQUINOLINIUM HALIDES Article Zubkov 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. Латвийский институт органического синтеза Латвийской академии наук / Springer New York Consultants Bureau. Vol. 49. 2013. P. 746-759