Dialkyl(4-hydroxybutyn-2-yl)[3-(p-tolyl)propyn-2-yl]ammonium chlorides undergo a diene synthesis type intramolecular cyclization in aqueous base medium to give 2,2-dialkyl-4-hydroxymethyl-6-methyl-benzo[f]isoindolinium chlorides. Under conditions of aqueous base fission intramolecular cyclization of the latter gives 4-dialkylaminomethyl-8-methyl-1,3-dihydronaphtho[1,2-c]furans.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 187-194, February, 2010.
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Chukhajian, E.O., Ayrapetyan, L.V., Chukhajian, E.O. et al. Base catalyzed intramolecular cycloaddition of dialkyl(4-hydroxybutyn-2-yl)[3-(p-tolyl)propyn-2-yl]ammonium chlorides and intramolecular recyclization of the products obtained. Chem Heterocycl Comp 46, 151–157 (2010). https://doi.org/10.1007/s10593-010-0486-1
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DOI: https://doi.org/10.1007/s10593-010-0486-1