Synthetic Transformations of Higher Terpenoids. 42. Synthesis of New 18-Nor-4-(Carboxyethyl)Isopimara-7,15-Diene Derivatives and Study of Their Cytotoxicity on MCF7, U-87 MG and DU 145 Cancer Cell LinesстатьяИсследовательская статья
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Аннотация:(E)-16-Aryl-substituted derivatives of tricyclic diterpenoids were synthesized by cross-coupling of isopimaric acid derivatives with substituted iodorenes catalyzed by palladium acetate in the presence of silver carbonate. Condensation of (E)-18-nor-4-(carboxyethyl)-16-(2-carboxyethyl)isopimar-7,15-diene dichloride with
propargylamine hydrochloride leads to the corresponding dialkine, which readily reacts with diazide in the Cu(I) catalyzed cycloaddition (CuAAC) reaction, with the formation of macroheterocyclic compound containing a pimaran type tricyclic diterpenoid core and 1,2,3-triazole rings in the linker chain. Reaction of in
situ prepared (E)-18-nor-16-azido-4-(carboxyethyl)isopimar-7,15-diene acid chloride with propargylamine hydrochloride or an alkynyl-substituted derivative of the protected Gly-Gly dipeptide leads to the corresponding azidoalkynes. The intramolecular CuAAC reaction of azidodipeptidylalkine afforded a macroheterocyclic derivative containing a dipeptide and triazole moiety in the linker chain. The obtained compounds
showed higher (compared with the isopimaric acid) cytotoxicity on tumor cells MCF-7 and were less toxic to non-cancer cells than the reference drug doxorubicin. The GI50 value of the most active compound is 6.3 μM, selectivity index >15) (MTT test). The synthesized derivatives of the tricyclic diterpenoid isopimaric acid can be used to develop new antitumor agents.
