To improve the properties of cytotoxic triterpenoid acids 1–5, a large set of hydrophilic esters was synthesized. We choose betulinic acid (1), dihydrobetulinic acid (2), 21-oxoacid 3 along with highly active des-E lupane acids 4 and 5 as a model set of compounds for esterification of which the properties needed to be improved. As ester moieties were used - methoxyethanol and 2-(2-methoxyethoxy)ethanol
anticancer properties of the derivatives of natural pentacyclic triterpenoids have received much attention recently. Here we present the preparation and the evaluation of the anticancer activity of a novel group of derivatives: quaternaryammonium esters. The esters were synthesized by quaternization of the respective 2-bromoethyl esters of betulinic, dihydrobetulinic, platanic, oleanolic, ursolic, and