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Pd-catalyzed synthesis of 2-alkynyl derivatives of 19β,28-epoxy-18α-olean-1-en-3-one

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Abstract

Basing on Sonogashira reaction of 2-iodo-19β,28-epoxy-18α-olean-1-en-3-one with alkynes an effective approach was developed to the synthesis of 2-alkynyl derivatives of 19β,28-epoxy-18α-olean-1-en-3-one. Initial 2-iodo-19β,28-epoxy-18α-olean-1-en-3-one was obtained by isomerization of the accessible betulin into allobetulin in the presence of Amberlyst 15, oxidation of allobetulin to 19β,28-epoxy-18α-olean-1-en-3-one under the action of 2-iodoxybenzoic acid, and iodination of the obtained enone in the presence of DMAP.

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Correspondence to V. V. Zorin.

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Original Russian Text © R.N. Shakhmaev, A.Sh. Sunagatullina, E.A. Abdullina, V.V. Zorin, 2017, published in Zhurnal Organicheskoi Khimii, 2017, Vol. 53, No. 11, pp. 1668–1672.

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Shakhmaev, R.N., Sunagatullina, A.S., Abdullina, E.A. et al. Pd-catalyzed synthesis of 2-alkynyl derivatives of 19β,28-epoxy-18α-olean-1-en-3-one. Russ J Org Chem 53, 1705–1709 (2017). https://doi.org/10.1134/S1070428017110173

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  • DOI: https://doi.org/10.1134/S1070428017110173

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