INTRAMOLECULAR DIELS–ALDER REACTION IN THE SYNTHESIS OF 5-ARYLISOXAZOLYLMETHYL- AND 4,5-DICHLOROISOTHIAZOLYLMETHYL-3A,6-EPOXYISOINDOL-3-ONES Article Mertsalov D.F., Lovtsevich L.V., Shelukho E.R., Kolesnik I.А., Petkevich S.K., Potkin V.I., Zaytsev V.P. Chemistry of Heterocyclic Compounds. Латвийский институт органического синтеза Латвийской академии наук / Springer New York Consultants Bureau. Vol. 57. 2021. P. 1031-1036