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Heterocyclic analogs of 5,12-naphthacenequinone 10.* Synthesis of furanoquinizarine and its new derivatives

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Chemistry of Heterocyclic Compounds Aims and scope

A new method was developed for synthesis of anthra[2,3-b]furan-5,10-dione derivatives. The key compound for annelation of the furan fragment to the anthraquinone chromophor is the previously unknown analog of salicylaldehyde, 1,4-dimethoxy-3-formyl-2-hydroxyanthraquinone, which we have synthesized by the Miller–Loudon–Schneider reaction. A chain of sequential transformations was used for its conversion into the target 4,11-dihydroxyanthra[2,3-b]furan-5,10-dione (furanoquinizarine): O-alkylation of the starting formylhydroxyanthraquinone with bromoacetic acid esters, cyclo-dehydration of the 3-formylanthraquinon-2-ylacetic acid esters in the presence of bases, hydrolysis of the obtained esters to 4,11-dimethoxy-5,10-dioxo-5,10-dihydroanthra[2,3-b]furan-2-carboxylic acid, its decarboxylation, and demethylation of the obtained 4,11-dimethoxyanthra[2,3-b]furan-5,10-dione.

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Notes

  1. Here and subsequently in the 13C NMR spectra all the unassigned signals belong to the quaternary carbon atoms.

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Correspondence to A. E. Shchekotikhin.

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*For Communication 9, see [1].

Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1464-1470, November, 2011.

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Tikhomirov, A.S., Shchekotikhin, A.E., Luzikov, Y.N. et al. Heterocyclic analogs of 5,12-naphthacenequinone 10.* Synthesis of furanoquinizarine and its new derivatives. Chem Heterocycl Comp 47, 1206–1211 (2012). https://doi.org/10.1007/s10593-012-0895-4

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