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An efficient and powerful organocatalytic cascade reaction was achieved for the synthesis of biologically important chiral spiro[pyrrolidin-3,2'-oxindoles] using very simple and readily available starting materials. Three C-C bonds and four contiguous stereogenic centers including one quaternary stereocenter were established in a single operation with reasonable yields and good stereoselectivity.
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http://dx.doi.org/10.1039/c3cc43755h | DOI Listing |
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September 2025
School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of AI-Driven Zero-Carbon Technologies, Key Laboratory of New Low-carbon Green Chemical Technology Education Department of Guangxi Zhuang Autonomous Region, Guangxi University, Nanning, 530004, China.
Sarcosine (Sar), a critical potential biomarker for prostate cancer (PCa), is primarily detected via enzyme cascade reactions involving sarcosine oxidase (SOx) and peroxidase. Nevertheless, the intermediate product hydrogen peroxide (HO) tends to diffuse to the bulk solution phase without entering subsequent reaction, leading to suboptimal detection sensitivity and compromised analytical performance. To tackle this challenge, a multilayered sandwich nanozyme cascade sensor (designated as Cu-MOF/Rf@BDC) is proposed through a confinement-mediated HO enrichment strategy.
View Article and Find Full Text PDFPhys Chem Chem Phys
September 2025
University of Coimbra, CQC-IMS, Department of Chemistry, 3004-535 Coimbra, Portugal.
2-Aminooxazole 1 is a key intermediate in plausible prebiotic pathways to activated pyrimidine ribonucleotides. However, its photochemistry and underlying reaction mechanism remain unclear. Here, we present a combined matrix-isolation infrared spectroscopic and computational investigation of the UV-induced photochemistry of 1.
View Article and Find Full Text PDFFront Bioeng Biotechnol
August 2025
Navy Special Medical Centre, Second Military Medical University, Shanghai, China.
Radiation exposure initiates a cascade of reactions, including the release of reactive oxygen species, DNA double-strand breaks, and cellular apoptosis, leading to cell death, tissue damage, and potentially the development of cancer. Consequently, there is an urgent need to develop highly effective and low-toxicity radioprotective agents. Traditional chemically synthesized protective agents face significant limitations in clinical applicability due to their pronounced off-target toxicity, narrow therapeutic window, and high production costs.
View Article and Find Full Text PDFJ Colloid Interface Sci
September 2025
School of Materials, Shenzhen Campus of Sun Yat-sen University, Shenzhen 518107, China. Electronic address:
Harnessing the significant buildup of lactic acid (LA) within the tumor microenvironment (TME) for metabolic manipulation presents a promising avenue for cancer treatment. Nevertheless, single-agent therapies often fail to address the complex and varying needs of TME heterogeneity, posing a substantial scientific hurdle in oncology. In this context, we employ asymmetric mesoporous silica nanoparticles (AMS NPs) as delivery vehicles, simultaneously loading them with zinc‑cobalt‑manganese ferrite nanoparticles (ZCMF NPs), lactate oxidase (LOX), and doxorubicin (DOX).
View Article and Find Full Text PDFAnal Chem
September 2025
School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China.
Pax-5a gene, as a nucleic acid biomarker closely associated with B-cell acute lymphoblastic leukemia (B-ALL), holds significant potential for early disease diagnosis. In this study, we developed a highly accurate and efficient "on-super on-off" photoelectrochemical (PEC) biosensor based on a dual-photoelectrode heterojunction system integrated with a multisphere cascade DNA amplification strategy. The designed heterojunction dual-photoelectrode platform, comprising a InO/CdS photoanode (on state) and an in situ-formed MIL-68(In)/InO (MIO) photocathode, effectively extends the electron-hole transport pathway, enhances photogenerated charge separation, and produces high-amplitude signal output (super on state), thereby providing a robust baseline for signal transduction.
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