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Two novel sesquiterpene lactones, cytotoxic vernolide-A and -B, from Vernonia cinerea.
  • Y. Kuo, Y. Kuo, +6 authors S. Li
  • Chemistry, Medicine
  • Chemical & pharmaceutical bulletin
  • 1 April 2003
Bioassay-directed fractionation of an ethanolic extract of stems of Vernonia cinerea has resulted in the isolation of two novel sesquiterpene lactones, vernolide-A and -B. Their structures wereExpand
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Antimicrobial activities of naphthazarins from Arnebia euchroma.
Bioassay-directed fractionation of extract of Arnebia euchroma led to the isolation of alkannin (1), shikonin (2), and their derivatives (3-8) as the active principles against methicillin-resistantExpand
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The reaction of ozonides from mono-substituted alkenes with stabilized phosphorus ylides
Ozonides derived from mono-substituted alkenes react with methyl (triphenylphosphoranylidene)acetate or (triphenylphosphoranylidene)acetophenone to form trans-α,β-unsaturated esters or ketones,Expand
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ANTIBACTERIAL PROPERTIES OF CHITOSAN IN WATERBORNE PATHOGEN
ABSTRACT The antimicrobial properties of chitosan, a derivative of chitin, were investigated in the solid and liquid culture against bacteria associated with waterborne disease in order to assess theExpand
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A novel cytotoxic C-methylated biflavone, taiwanhomoflavone-B from the twigs of Cephalotaxus wilsoniana.
A novel C-methylated biflavone, taiwanhomoflavone-B (1), together with known compounds, 7,4',7"-tri-O-methylamentoflavone, 6-C-methylnaringenin and apigenin-7-O-beta-glucoside were isolated from anExpand
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A Novel Secondary Metabolite Relative to the Degradation of PR Toxin by Penicillium roqueforti
Abstract. A secondary metabolite different from PR-imine and PR-amide was produced in the liquid (YESC) and solid (buckwheat) culture medium of Penicillium roqueforti. We isolated and purified theExpand
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Sesquiterpene polyol esters and triterpenes from Celastrus punctatus
Five sesquiterpene polyol esters with ss-dihydroagarofuran including 1ss-acetoxy-8ss,9α-dibenzoyloxy-6α-hydroxy-2ss(α-methylbutanoyloxy)-ss-dihydroa garofuran(1),Expand
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SYNTHESIS, STRUCTURE, AND REACTIVITY OF RHENIUM N-ISOCYANIDE COMPLEXES REBR(CO)3(CNR)(CNNPPH3)
Abstract The rhenium isocyanide complex ReBr(CO)3(CNR)(NCMe) (1) reacted with CNNPPh3 in CH2Cl2 to give ReBr(CO)3(CNR)(CNNPPh3) (2a, R=Ph; 2b, R=Pr) in good yields. Treatment of 2 with ketones in theExpand
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