The action of 2,3-dimethylbenzothiazol-3-ium iodide on 1H-benzo[f]chromenes containing an acceptor substituent in the β-position to the oxygen atom in the presence of triethylamine results in the opening of the pyran ring and the formation of [(2E,4Z)-4-(3-methylbenzothiazol- 2(3H)-ylidene)but-2-en-1-yl]naphthalen-2-ols. In the case of 1-aryl-2-nitro-1H-benzo[f]chromenes, 3-methyl-2-[(1E,3Z)- 3-(3-methylbenzothiazol-2(3H)-ylidene)prop-1-en-1-yl]benzothiazol-3-ium iodide was isolated. The resulting compounds containing the merocyanine chromophore are of interest as dyes and fluorescent labels.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, 2022, 58(11), 634–638
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Korzhenko, K.S., Osyanin, V.А., Osipov, D.V. et al. The reactions of electron-deficient 1Н-benzo[f]chromenes with 2,3-dimethylbenzothiazol-3-ium iodide. Chem Heterocycl Comp 58, 634–638 (2022). https://doi.org/10.1007/s10593-022-03137-z
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DOI: https://doi.org/10.1007/s10593-022-03137-z