New Lupane Triterpene Fatty Acid Ester from Leaves ofMaclura pomifera

3-O-(3′-Hydroxytetradecanoyl)lupeol from Sorocea trophoides Inhibits Cruzain

The crude chloroform extract from the stem bark of Sorocea trophoides (Moraceae) showed in-vitro inhibition of the cysteine protease cruzain. Activity-directed fractionation led to isolation of the novel 3- O-(3′-hydroxytetradecanoyl)lupeol as the inhibitory agent. The structure was elucidated by analysis of NMR spectra.

Phenolics from the Fruits of Maclura pomifera

Two new compounds, maclurin A (1) and maclurin B (2), and six known ones, ononin (3), pterofuran (4), osajin (5), pomiferin (6), 3,4-dihydroxybenzoic acid (7), and 2,3,4-trihydroxybenzoic acid (8) were isolated from the fruit of Maclura pomifera. Compounds 3 and 4 were isolated from the genus for the first time. Structure elucidation was achieved by spectroscopic measurements and by comparison with literature data. Compounds 2-4 exhibited activities against the cancer cell lines A549 and Panc-28 with GI50 values from 18.1 to 32.2, and 20.6 to 43.5 μM, respectively. Compounds 2 and 4 also showed cytotoxicity against HCT 116 with GI50 values of 47.2 and 24.4 μM, respectively.

New lupane triterpenoids from Solidago canadensis that inhibit the lyase activity of DNA polymerase β

Bioassay-directed fractionation of a methyl ethyl ketone extract of Solidago canadensis L. (Asteraceae), using an assay to detect the lyase activity of DNA polymerase beta, resulted in the isolation of the four new lupane triterpenoids 1-4 and the seven known compounds lupeol, lupeyl acetate, ursolic acid, cycloartenol, cycloartenyl palmitate, alpha-amyrin acetate, and stigmasterol. The structures of the new compounds were established as 3beta-(3R-acetoxyhexadecanoyloxy)-lup-20(29)-ene (1), 3beta-(3-ketohexadecanoyloxy)-lup-20(29)-ene (2), 3beta-(3R-acetoxyhexadecanoyloxy)-29-nor-lupan-20-one (3), and 3beta-(3-hetohexadecanoyloxy)-29-nor-lupan-20-one (4), respectively, on the basis of extensive 1D and 2D NMR spectroscopic interpretation and chemical modification studies. All 11 compounds were inhibitory to the lyase activity of DNA polymerase beta.

Lupeol esters from the twig bark of Japanese pear (Pyrus serotina Rehd.) cv. Shinko

Five new lupeol esters, lup-20(29)-ene-3beta-yl eicosanoate, docosanoate, tetracosanoate, hexacosanoate and octacosanoate, were isolated as a mixture from the twig bark of Japanese pear (Pyrus serotina Rehd.) cv. Shinko, together with lupeol and epifriedelinol. Their structures were determined by spectral analyses including 2D-NMR experiments.