[4+2] CYCLOADDITION OF Α,Β-UNSATURATED ACID ANHYDRIDES TO 2-FURYLPIPERIDIN-4-ONES: THE SHORT ROUTE TO ANNULATED 8,10A-EPOXYPYRIDO[2,1-A] ISOINDOLES Article Zubkov F.I., Airiyan I.K., Dzyubenko A.A., Yudina N.I., Zaytsev V.P., Nikitina E.V., Varlamov A.V., Khrustalev V.N., Grudinin D.G. Journal of Heterocyclic Chemistry. HeteroCorporation. Vol. 47. 2010. P. 400-414