Two new cytotoxic tetracyclic tetraterpenoids, methyl tortuoate A (1) and methyl tortuoate B (2), along with the known methyl sartortuoate (3) were isolated from the soft coral Sarcophyton tortuosum. The structures of 1 and 2 were established by spectroscopic methods, mainly on the basis of 2D NMR techniques, and were confirmed by single-crystal X-ray diffraction analysis. The cytotoxic activities of these compounds were carried out in vitro on human nasophyringeal carcinoma (CNE-2) and murine lymphocytic leukemia (P-388) tumor cell lines.
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http://dx.doi.org/10.1021/np0400151 | DOI Listing |
Org Lett
January 2025
Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States.
We describe a stereoselective synthesis of the dimeric diazofluorene , a potential precursor to the cytotoxic -symmetric bacterial metabolite (-)-lomaiviticin A (). An efficient route was developed to convert the tetracyclic diol to the diketone (five steps, 30% overall). Oxidative dimerization of the enoxysilane provided the -symmetric dimeric diazofluorene in 56% yield and with 15:1:0 diastereoselectivity.
View Article and Find Full Text PDFJ Org Chem
January 2025
School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang 110016, People's Republic of China.
Three seco-norabietane diterpenoids, salvicsites A-C (-), along with two known compounds, were isolated from the roots and rhizomes of Diels f. Stib. Salvicsite A () represents an unprecedented structural combination, featuring an eight-membered α-methyl-α,β-unsaturated lactone ring and a five-membered α,β-unsaturated lactone ring, based on a 6/6/5/8 ring system.
View Article and Find Full Text PDFPhytochemistry
February 2025
State Key Laboratory on Technologies for Chinese Medicine Pharmaceutical Process Control and Intelligent Manufacture, Nanjing University of Chinese Medicine, Nanjing, 210023, China; School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, 210023, China. Electronic address:
Endophytic actinomycetes exhibit considerable potential for the production of biologically active metabolites due to their coevolution with plant hosts. In this study, an endophytic Streptomyces chartreusis M7 was isolated from Houttuynia cordata Thunb. Bioactivity-guided investigation of the metabolites produced by this strain led to the identification of thirteen anthracycline-derived polyketides, including five unreported anthraquinones designated streptoquinones A-E (1-5) and two undescribed angular polyketides named chartins A and B (6-7) along with six knowns.
View Article and Find Full Text PDFFitoterapia
January 2025
School of Pharmaceutical Sciences, Jilin University, Changchun 130021, PR China. Electronic address:
As one of the metabolites of ginseng, 20(S)-protopanaxadiol (PPD) is a compound with dammarane-type tetracyclic triterpene, which performs a wide range of anticancer activities. In this study, PPD was used as a lead. A series of compounds were synthesized respectively with 11 amino acids through esterification and were evaluated for their cytotoxicity against several cancer cell lines.
View Article and Find Full Text PDFMolecules
September 2024
Institute of Chemistry, University of Silesia, Szkolna 9, 40-007 Katowice, Poland.
In this work, the synthesis, structural analysis and anticancer properties of 5-methyl-9-trifluoromethyl-12-quino[3,4-][1,4]benzothiazinium chloride () are described. Compound was synthesized by reacting 1-methyl-4-butylthio-3-(benzoylthio)quinolinium chloride with 4-(trifluoromethyl)aniline, respectively. The structure of the resulting product was determined using H-NMR and C-NMR spectroscopy as well as HR-MS spectrometry.
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