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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Synthesis of antimalarial amide analogues based on the plant serrulatane diterpenoid 3,7,8-trihydroxyserrulat-14-en-19-oic acid.
Bioorganic & Medicinal Chemistry Letters 2017 September 2
A plant-derived natural product scaffold, 3,7,8-trihydroxyserrulat-14-en-19-oic acid (1) was isolated in high yield from the aerial parts of the endemic Australian desert plant Eremophila microtheca. This scaffold (1) was subsequently used in the generation of a series of new amide analogues via a one-pot mixed anhydride amidation using pivaloyl chloride. The structures of all analogues were characterized using MS, NMR, and UV data. The major serrulatane natural products (1-3), isolated from the plant extract, and all amide analogues (6-15) together with several pivaloylated derivatives of 3,7,8-trihydroxyserrulat-14-en-19-oic acid (16-18) were evaluated for their antimalarial activity against 3D7 (chloroquine sensitive) and Dd2 (chloroquine resistant) Plasmodium falciparum strains, and preliminary cytotoxicity data were also acquired using the human embryonic kidney cell line HEK293. The natural product scaffold (1) did not display any antimalarial activity at 10µM. Replacing the carboxylic acid of 1 with various amides resulted in moderate activity against the P. falciparum 3D7 strain with IC50 values ranging from 1.25 to 5.65µM.
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