A new family of pentacyclic compounds incorporating a central 1,2-dihydropyridine core is obtained through a pseudo three-component reaction. Four new bonds and two stereocenters with trans relationship are produced during the cascade process under palladium catalysis.
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http://dx.doi.org/10.1039/c0ob00390e | DOI Listing |
Biochem Biophys Res Commun
December 2024
The Rappaport Faculty of Medicine and Research Institute, and the Rappaport Technion Integrated Cancer Center (R-TICC), Technion-Israel Institute of Technology, Haifa, 3109601, Israel. Electronic address:
The ubiquitin proteasome system (UPS), driven by ubiquitin as a degradation signal, eliminates, in a highly specific manner, 'abnormal' proteins and proteins that completed their function. This process involves a hierarchical cascade of E1, E2, and E3 enzymes. The E3 ubiquitin ligases, act as specific receptors that bind their cognate substrates.
View Article and Find Full Text PDFBiomaterials
December 2024
Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan, Shandong, 250061, PR China. Electronic address:
Chronic diabetic wound poses a pressing global healthcare challenge, necessitating an approach to address issues such as pathogenic bacteria elimination, blood sugar regulation, and angiogenesis stimulation. Herein, we engineered a BiWO@CuO-GOx bio-heterojunction (BWCG bio-HJ) with exceptional cascade catalytic performance and impressive sonosensitivity to remodel the wound microenvironment and expedite the diabetic wound healing. Specifically, the Z-scheme junctions of BiWO@CuO significantly augmented carrier separation dynamics, leading to the highly efficient generation of reactive oxygen species (ROS) upon US irradiations.
View Article and Find Full Text PDFFood Chem
December 2024
Laboratory of Functional Polymers, School of Materials Science and Engineering, Linyi University, Linyi 276005, China. Electronic address:
Organicphosphorus is a ubiquitous pesticide that has potential hazards to human health and environmental well-being. Therefore, the precise identification of residues of organophosphorus pesticides (OPs) emerges as an urgent necessity. A ratiometric fluorescent sensor for the detection of OPs by leveraging the catalytic activities of Ce and Ce on the two fluorescent substrates 4-Methylumbelliferyl phosphate (4-MUP) and o-phenylenediamine (OPD) correspondingly was designed.
View Article and Find Full Text PDFStem Cells Transl Med
December 2024
NEI/OSCTRS/OGVFB, Bethesda, MD, United States.
Retinal pigment epithelium (RPE) atrophy is a significant cause of human blindness worldwide, occurring in polygenic diseases such as age-related macular degeneration (AMD) and monogenic diseases such as Stargardt diseases (STGD1) and late-onset retinal degeneration (L-ORD). The patient-induced pluripotent stem cells (iPSCs)-derived RPE (iRPE) model exhibits many advantages in understanding the cellular basis of pathological mechanisms of RPE atrophy. The iRPE model is based on iPSC-derived functionally mature and polarized RPE cells that reproduce several features of native RPE cells, such as phagocytosis of photoreceptor outer segments (POS) and replenishment of visual pigment.
View Article and Find Full Text PDFJ Am Chem Soc
December 2024
Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States.
We present a six-step cascade that converts 1,3-distyrylbenzenes (-stilbenes) into nonsymmetric pyrenes in 40-60% yields. This sequence merges photochemical steps, ,-alkene isomerization, a 6π photochemical electrocyclization (Mallory photocyclization); the new bay region cyclization, with two radical iodine-mediated aromatization steps; and an optional aryl migration. This work illustrates how the inherent challenges of engineering excited state reactivity can be addressed by logical design.
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