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A Rh-catalyzed weak chelation-guided C4-alkylation of indoles has been accomplished using cyclopropanols as an alkylating agent via the cascade C-H and C-C bond activation. The substrate scope, functional group tolerance, and late-stage mutation of drug molecules are the important practical features.
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http://dx.doi.org/10.1021/acs.orglett.2c02265 | DOI Listing |
J Prosthet Dent
September 2025
Associate Professor, School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan, ROC. Electronic address:
Statement Of Problem: While valued for their durability in dental prosthetics, polyaryletherketone (PAEK) materials, known for their chemical inertness and low surface energy, pose significant challenges in achieving durable adhesion to resin cements, a critical factor for the long-term success of dental restorations.
Purpose: This study evaluates the novel application of a methyl methacrylate-urethane dimethacrylate (MMA-UDMA) bonding primer following handheld nonthermal plasma (HNP) treatment to enhance the bonding performance and aging durability of PAEK materials with varying microfiller compositions, addressing the persistent challenge of achieving long-term adhesion in dental restorations.
Material And Methods: Three PAEK types, ceramic-filled polyetheretherketone (PEEK), titanium dioxide-filled polyetherketoneketone (PEKK), and PEEK with disk shape (Ø10×2.
Nucleic Acids Res
September 2025
Department of Biological Sciences, Columbia University, New York, NY 10027, United States.
The 3'-end cleavage and polyadenylation of pre-mRNAs is dependent on a key hexanucleotide motif known as the polyadenylation signal (PAS). The PAS hexamer is recognized by the mammalian polyadenylation specificity factor (mPSF). AAUAAA is the most frequent PAS hexamer and together with AUUAAA, the second most frequent hexamer, account for ∼75% of the poly(A) signals.
View Article and Find Full Text PDFJ Colloid Interface Sci
September 2025
State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China; Key Laboratory of Catalysis, China National Petroleum Corporation (CNPC), Qingdao 266580, PR China. Electronic address:
With the trend of heavy and inferior crude oil, the design of hydrodesulfurization (HDS) catalysts with excellent activity and high active metal utilization is an inevitable trend for the upgrading of refining technology. In this study, a highly dispersed Mo catalyst confined within nitrogen-doped porous carbon (xMo@NC) was prepared using an in situ encapsulation-pyrolysis approach and used in the HDS reaction of dibenzothiophene (DBT). The methods of XRD, HRTEM, HAADF-STEM, N physisorption, FT-IR, Raman, and XPS were used to carry out thorough microstructural characterization.
View Article and Find Full Text PDFJ Am Chem Soc
September 2025
Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany.
The carbonyl-ene reaction between aldehydes and olefins constitutes a perfectly atom economic approach to homoallylic alcohols with concomitant C-C bond formation. However, the scope of catalytic asymmetric intermolecular versions is currently limited to activated substrates, while of the two intramolecular types only catalytic asymmetric (-)-carbonyl-ene type cyclizations can be considered mature. The corresponding (-)-cyclizations would arguably find equal utility in chemical synthesis but remain underdeveloped.
View Article and Find Full Text PDFBioconjug Chem
September 2025
Pôle Chimie Balard, IBMM - UMR 5247, 1919, Route de Mende, 34293 Montpellier cedex 5, France.
Phosphole-based fluorophores are attractive dyes for bioimaging due to their relatively compact molecular structures, strong fluorescence up to the near-infrared region with large Stokes shifts, and remarkable resistance to photobleaching. Therefore, the development of efficient and chemoselective coupling methods for functionalizing phospholes is of significant interest for biomolecular labeling. Herein, we describe the synthesis of novel P-aminophospholes and their use for direct conjugation to cysteinyl peptides under mild conditions.
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