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Synthesis of functionalized difluoronaphthalenes by regioselective C—H functionalization of 2,3-difluoronaphthalene

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Abstract

2,3-Difluoronaphthalene (1) was selectively converted into 1-methyl-, 1,4-dimethyl-, 1-acetyl-, 1-acetyl-4-methyl-, 1-formyl-, and 1-carboxyl-substituted 2,3-difluoronaphthalenes using lithiation with BuLi as a key step. Nitration and bromination of compound 1 predominantly gave 6,7-difluoro-1-nitronaphthalene and 1-bromo-6,7-difluoronaphthalene, respectively. Regioselectivity of acylation of compound 1 and 2,3-difluoro-1,4-dimethylnaphthalene with AcCl in the presence of AlCl3 dramatically depended on the order of mixing and addition of the reagents. Under the optimized conditions, the yields of 1-(6,7-difluoronaphthalen-1-yl) ethanones and 1-(6,7-difluoronaphthalen-2-yl)ethanones reached 68–93%.

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Correspondence to N. V. Volchkov.

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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 0270–0279, February, 2020.

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Volchkov, N.V., Lipkind, M.B. & Nefedov, O.M. Synthesis of functionalized difluoronaphthalenes by regioselective C—H functionalization of 2,3-difluoronaphthalene. Russ Chem Bull 69, 270–279 (2020). https://doi.org/10.1007/s11172-020-2756-0

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  • DOI: https://doi.org/10.1007/s11172-020-2756-0

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