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An improved green synthesis of the E2F inhibitor HLM0066474 is described, using solvent-free and microwave irradiation conditions. The two enantiomers are separated using semi-preparative separation on Chiralpak ID and their absolute configuration is determined by vibrational circular dichroism (VCD) analysis. Biological evaluation of both enantiomers on E2F1 transcriptional activity reveals that the (+)-R, but not the (-)-S enantiomer is biologically active in repressing E2F1 transcriptional activity.
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http://dx.doi.org/10.1016/j.bmcl.2018.12.037 | DOI Listing |
Phytochemistry
September 2025
State Key Laboratory of Phytochemistry and Natural Medicines, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China; Yunnan Characteristic Plant Extraction Laboratory Co. Ltd, Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Educa
Alstoniaschines A‒I (1‒9), nine previously alkaloids sharing five different skeletons were obtained from the leaves of Alstonia scholaris. The structures and absolute configurations were established by their extensive spectroscopic data analyses, including NMR, HRESIMS, X-ray crystallography data, and theoretical ECD calculations. Compounds 1, 2, 3, and 9 exerted significant protective effect against oxidative stress and inflammatory damage of podocytes induced by high glucose, manifesting as the increase of superoxide dismutase, catalase, glutathione peroxidase, alongside the reductions of malondialdehyde, nitric oxide, lactate dehydrogenase.
View Article and Find Full Text PDFChem Biodivers
September 2025
Key Lab of Natural Product Chemistry and Application at Universities of Education, Department of Xinjiang Uygur Autonomous Region, School of Chemistry and Chemical Engineering, Yili Normal University, Xinjiang, China.
The persistent threat posed by phytopathogenic fungi to agricultural systems underscores the critical need for novel fungicides. Here, we synthesized and characterized a series of novel acridospiroisoxazole derivatives (H1-H36) using H/C NMR and mass spectrometry. The absolute configuration of compound H23 was confirmed using single-crystal x-ray diffraction analysis.
View Article and Find Full Text PDFJ Nat Prod
September 2025
College of Pharmacy, Chungbuk National University, Cheongju 28160, Republic of Korea.
LC-HRMS/MS-based molecular-network-guided chemical investigation of led to the isolation of seven undescribed tetrasaccharide-type resin glycosides (-). Their structures were elucidated using 1D and 2D NMR and HRESIMS analysis. Isolated resin glycosides were comprised of d-glucose, d-fucose, d-quinovose, and l-rhamnose, and these monosaccharides were partially acylated with acetyl, isobutyryl, -hexanoyl, and niloyl organic acids.
View Article and Find Full Text PDFRev Sci Instrum
September 2025
Department of Physics, University of Strathclyde, Glasgow, G1 1XJ, United Kingdom.
The calibration of the JET x-ray spectrometer is presented. The absolute throughput, diffractor focusing, and instrument function of the spectrometer are presented, and the quality of the ion temperature measurement is re-assessed, particularly at the lower end. The addition of a second diffractor enables the simultaneous measurements of the spectra from H- and He-like nickel, which widens the spatial coverage of the core-ion temperature measurements for high-performance plasmas at a fixed Bragg angle range.
View Article and Find Full Text PDFJ Nat Med
September 2025
College of Life Sciences, Shanghai Normal University, Shanghai, 2014018, People's Republic of China.
Two new (1-2) and eight known pterosins (3-10) were obtained from the aerial parts of Hypolepis punctata. One compound (11) was synthesized from compound 4. Their structures were established by spectroscopic methods and the absolute configuration was further determined by single-crystal X-ray diffraction analysis for compounds 1, 3 and 4.
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