Abstract
A preparative synthesis of glucosides of the lupane-type triterpene acids betulinic, dihydrobetulinic, betulonic, dihydrobetulonic, and 3,20-dioxo-30-norlupan-28-oic was proposed. Glycosylation of 3-hydroxyacids by α-acetobromoglucose (ABG) with Ag2O was performed in pyridine (Py)to formglycosides at C-28, repeated glycosylation of which by these same reagents but in CH2Cl2 generated a glycoside bond at C-3 to form bisglucosides. 28-Glucosides of ketoacids were formed in high yields in both Py and CH2Cl2.
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Samoshina, N.F., Denisenko, M.V., Denisenko, V.A. et al. Synthesis of Glycosides of Lupane-Type Triterpene Acids. Chemistry of Natural Compounds 39, 575–582 (2003). https://doi.org/10.1023/B:CONC.0000018113.79735.34
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DOI: https://doi.org/10.1023/B:CONC.0000018113.79735.34