A Novel Chalcone from Garcinia Nervosa

Polyisoprenylated Acylphloroglucinols from Garcinia nervosa

Two new polyisoprenylated acylphloroglucinols, 7- epi-isoxanthochymol and 7- epi-cycloxanthochymol (1 – 2), were isolated from the barks of Garcinia nervosa together with their 7-epimers isoxanthochymol (3) and cycloxanthochymol (4). Their structures were determined on the basis of NMR spectroscopic data. The cytotoxic activity of the isolated compounds against HL-60, MCF-7 (human breast adenocarcinoma), A549 (human lung adenocarcinoma) and HepG2 (human hepatocellular carcinoma) cells were evaluated, and all compounds showed cytotoxic activity against all cell lines.

Structure elucidation, DNA binding specificity and antiproliferative proficiency of isolated compounds from Garcinia nervosa

Garcinia nervosa is an abundant source of bioactive phytochemicals. The present paper deals with the isolation of a novel isoflavone 5,7-dihydroxy-3-(3'-hydroxy-4',5'-dimethoxyphenyl)-6-methoxy-4H-chromen-4-one (1) along with a known compound DL-Allantoin (2) from the ethanolic extract of the leaves of Garcinia nervosa (Family: Guttiferae). Their structures were elucidated on the basis of chemical and physical evidences viz. elemental analysis, UV, FT-IR, ¹H NMR, ¹³C NMR and mass spectral analysis. Single-crystal X-ray analysis was further used for the authentication of structure of both compounds (1 and 2). Interaction studies of compound (1) and (2) with ctDNA were studied by UV-Visible spectroscopy, fluorescence, KI quenching studies, competitive displacement assay and circular dichroism studies, which showed groove binding interaction (non-intercalation) of both the compounds 1 and 2 with ctDNA. However, compound 1 (K=3.9×10⁴M^-1) shows higher binding affinity to the ctDNA than compound 2 (K=1.44×10⁴M^-1). The molecular modeling results also illustrated that compound 1 strongly binds to groove of DNA by relative binding energy of docked structure -6.82kcal/mol. In addition the antiproliferative activity also showed high potential of compound 1 against MCF-7 and MDA-MB 231 cell line with IC₅₀ value 8.44±3.5μM and 6.94±2.6μM, respectively.

Synthesis of 5′-Bromo-2′-Hydroxy-4,4′,6′-TrimetHoxychalcone from Garcinia Nervosa and of its Isomer 3′-Bromo-2′-Hydroxy-4,4′,6′-Trimethoxychalcone

The unambiguous syntheses of the naturally occurring 5′-bromo-2′-hydroxy-4,4′,6′-trimethoxychalcone 1, a constituent of Garcinia nervosa, and its positional isomer 3′-bromo-2′-hydroxy-4,4′,6′-trimethoxychalcone 6 are described.