Abstract
The bisacylation of the anhydride and esters of 4-methyl-1,2,3,4-tetrahydrophthalic acid by anhydrides of carboxylic acids in the presence of perchloric acid results in the formation of derivatives of 1,3-dialkyl-6, 7-dicarboxy-5,6,7,8-tetrahydro-2-benzopyrylium salts. Some reactions of the salts obtained, including their recyclization under the action of nucleophiles, have been studied. A convenient preparative method for the synthesis of 6,7-dicarboalkoxy-5,6,7,8-tetrahydroixoquinolines has been developed.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1318–1321, October, 1984.
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Dulenko, V.I., Golyak, V.M., Alekseev, N.N. et al. Bisacylation of the anhydride and esters of 4-methyl-1,2,3,4-tetrahydrophthalic acid. Chem Heterocycl Compd 20, 1078–1081 (1984). https://doi.org/10.1007/BF00503592
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DOI: https://doi.org/10.1007/BF00503592