Polyfuryl(Aryl)Alkanes And Their Derivatives. 7. New Recyclization And Cyclization Reactions In The 2-Hydroxyaryldifurylmethane Series

Article abstract of DOI:10.1007/BF00534462

Reaction of 2-hydroxybenzaldehydes with α-methylfuran (sylvan) under acid-catalysis conditions was investigated It is shown that the reaction does not stop at the step involving formation of 2-hydroxyarylfuryl-methanes but proceeeds further with opening of one of the furan rings and recyclization to 3-furylbenzo-furan derivatives.The latter in turn undergo transformations that lead to new heterocyclic systems - 5,6-dihydro-2,4-dimethyl-4-(5-methyl-2-furyl)-4H-benzofuro<2,3-h>cyclopentafurans.Data from the IR, PMR, and mass spectra, alternative synthesis, and x-ray diffraction analysis were used to confirm structures of the synthesized compounds.