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. 2021 Apr 14;26(8):2271. doi: 10.3390/molecules26082271

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Scheme 5 — Preparation of glycoside of betulinic acid [81,82]. Reagents and conditions: (i) potassium carbonate, acetone, and acetonitrile, 20 °C, 96 h; (ii) silver(l) oxide, and pyridine, 3 h.