Synthesis and cytotoxic activity evaluation of maleopimaric and dihydroquinopimaric esters and amides

The new 1-, 1,4- and 1,4,20-diethoxyphosphoryl-containing esters were synthesized as a result of interaction of dihydroquinopimaric acid methyl ester hydroxyl derivatives with diethylchlorophosphite, A study of the cytotoxic activity in vitro on 60 cell lines of nine different human tumors of methyl ester of dihydroquinopimaric acid with diethoxyphosphoryl, furan and indole fragments, as well as diterpene amides with linear, heterocyclic and aromatic amines residues showed that diethoxyphosphoryl and benzylamine substituents are of key importance for the manifestation of the cytotoxic effect. Diethoxyphosphoryl derivatives (XIX) and (XVII), and benzylamide (IX) showed cytotoxic activity against one, seven and four cell lines of breast cancer, leukemia, non-small cell lung cancer, melanoma and prostate cancer, respectively. The greatest activity was demonstrated by maleopimaric acid benzylamide (XIII), which effectively inhibited the growth of 19 cell lines of eight cancer types and had a significant cytotoxic effect against all studied leukemia cell lines.