19-(2,6-Dimethylpyrid-4-yl)-20,29,30-trinorlupanes in addition to triterpenoid derivatives condensed in ring A of the pyran-4-one ring were synthesized for the first time from betulin, betulin diacetate, and methyl esters of 3-acetylbetulinic and betulonic acids.
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Translated from Khimiya Prirodnykh Soedinenii, No. 2, March–April, 2014, pp. 268–273.
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Antimonova, A.N., Petrenko, N.I., Shakirov, M.M. et al. Synthesis of 19-(2,6-Dimethylpyrid-4-yl)-20,29,30-trinorlupanes. Chem Nat Compd 50, 305–310 (2014). https://doi.org/10.1007/s10600-014-0938-4
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DOI: https://doi.org/10.1007/s10600-014-0938-4