Abstract
The reaction of a linearly fused furocoumarin, oreoselone, with p-toluenesulfonyl chloride gave 2-tosyloreoselone which showed a high reactivity in palladium-catalyzed cross-coupling reactions with formation of a new carbon-carbon bond. 2-Tosyloreoselone reacted with terminal alkynes in the presence of Pd(PPh3)2Cl2 to give the corresponding 2-alkynylfuro[3,2-g]chromen-3-ones. 2-Aryl(hetaryl)alkynyloreoselones were obtained in high yield directly by palladium-catalyzed reaction of oreoselone with tosyl chloride and aryl(hetaryl)acetylenes. The reaction of 2-tosyloreoselone with aryl(hetaryl)boronic acids in the presence of palladium complexes with uni- and bidentate ligands, tetrabutylammonium bromide, and a base afforded 2-aryl(hetaryl)-substituted oreoselones. 2-Vinyloreoselone was synthesized from 2-tosyloreoselone and potassium trifluoro(vinyl)borate.
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Original Russian Text © A.B. Lipeeva, E.E. Shul’ts, M.M. Shakirov, G.A. Tolstikov, 2013, published in Zhurnal Organicheskoi Khimii, 2013, Vol. 49, No. 1, pp. 105–112.
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Lipeeva, A.B., Shul’ts, E.E., Shakirov, M.M. et al. Plant coumarins: XI. Cross coupling reactions with 2-(tosyl)oreoselone. Russ J Org Chem 49, 99–107 (2013). https://doi.org/10.1134/S107042801301017X
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DOI: https://doi.org/10.1134/S107042801301017X