RESUMO
Four new homoisoflavonoids, 7-hydroxy-3-[hydroxy(4'-methoxyphenyl)methyl]-benzopyran-4-one (1), (3R)-7, 8-dihydroxy-3-(4'-methoxybenzyl)-chroman-4-one (2), 7-hydroxy-3-(2'-hydroxy-4'-methoxybenzyl)-chroman-4-one (3), and 7-hydroxy-3-(2'-hydroxy-4'-methoxybenzyl)-benzopyran-4-one (4), were isolated from the seeds of Caesalpinia pulcherrima. The structures of new compounds were elucidated by MS and NMR spectra. Their absolute configurations were assigned using electronic circular dichroism spectrum. Compounds 2 and 4 exhibited cytotoxic effects on MCF-7/TAM cells with the IC50 values of 101.4 ± 0.03 and 93.02 ± 0.03 µM, respectively.
RESUMO
Three new caryophyllene-type sesquiterpenoid glycosides were isolated from Biebersteinia heterostemon. Their structures were elucidated by comprehensive analysis of NMR and MS spectroscopic data. All the isolated compounds were evaluated for MCF-7/TAM cytotoxic activity. The results indicated that compound 1 was found to exhibit the weak cytotoxicity against MCF-7/TAM with the IC50 value of 106.4 ± 0.04 µM.
RESUMO
Two undescribed steroids, named (15 R)-2,15-dihydroxypregna-1,4-dien-3,16-dione (1) and 2,15-dihydroxypregna-1,4,14-trien-3,16-dione (2), were isolated from the aerial parts of Munronia pinnata (Wall.) W. Theob. The structure elucidation of two compounds was performed by using spectroscopic methods and comparing the literature. Compound 2 exhibited inhibitory effect against PTP-1B with an IC50 value of 152.07 ± 3.33 µM, and compound 1 was inactive.
RESUMO
Two new norcassane-type diterpenoids, named 6ß-hydroxy-bisnorcass-13-en-12-one (1) and 6ß-hydroxy-bisnorcassan-12-one (2), were isolated from the seeds of Mezonevron sinense Hemsl. The structures of compounds 1-2 were determined by extensive spectroscopic analysis. Two compounds exhibited immunosuppressive activity with the IC50 values of 19.35 ± 0.87 µM and 18.69 ± 0.88 µM in the ConA induced T cell model and 65.04 ± 0.83 µM and 48.06 ± 0.76 µM in LPS induced B cell model, respectively.