A direct asymmetric dearomative amination of tryptamines with O-(2,4-dinitrophenyl)hydroxylamine (DPH) was achieved using CuBr-bisoxazoline complex as a catalyst, affording 3a-amino-pyrroloindolines in good to excellent enantioselectivity under mild reaction conditions. Furthermore, the synthetic value of this method was demonstrated in the total synthesis of (-)-psychotriasine in a highly concise manner.
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http://dx.doi.org/10.1002/anie.201508570 | DOI Listing |
J Biomed Inform
January 2025
Harvard Medical School, Boston, MA, USA; VA Boston Healthcare System, Boston, MA, USA; Harvard T.H. Chan School of Public Health, Boston, MA, USA. Electronic address:
Motivation: The increasing availability of electronic health record (EHR) systems has created enormous potential for translational research. Recent developments in representation learning techniques have led to effective large-scale representations of EHR concepts along with knowledge graphs that empower downstream EHR studies. However, most existing methods require training with patient-level data, limiting their abilities to expand the training with multi-institutional EHR data.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Chinese Academy of Sciences Qingdao Industrial Energy Storage Technology Institute, Department of Energy Science and Energy Technology, Songling Road, 189, 266101, Qingdao City, CHINA.
Membrane-assisted direct seawater splitting (DSS) technologies are actively studied as a promising route to produce green hydrogen (H2), whereas the indispensable use of supporting electrolytes that help to extract water and provide electrochemically-accelerated reaction media results in a severe energy penalty, consuming up to 12.5% of energy input when using a typical KOH electrolyte. We bypass this issue by designing a zero-gap electrolyzer configuration based on the integration of cation exchange membrane and bipolar membrane assemblies, which protects stable DSS operation against the precipitates and corrosion in the absence of additional supporting electrolytes.
View Article and Find Full Text PDFSci Adv
January 2025
Ramaciotti Centre for Cryo-Electron Microscopy, Monash University, Clayton, VIC, Australia.
High-resolution cryo-electron microscopy (cryo-EM) requires costly 200- to 300-keV cryo-transmission electron microscopes (cryo-TEMs) with field emission gun (FEG) sources, stable columns, constant-powered lenses, autoloader, and direct electron detectors (DED). Recent advances in 100-keV imaging with the emergence of sub-200-keV optimized DED technology promises the development of more affordable cryo-TEMs. So far, 100-keV imaging has required microscopes with FEG sources.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
Yale University, New Haven, CT, USA.
Background: Advances in Alzheimer's disease (AD) have revealed a novel fluid biomarker, tau phosphorylated at T217 (pT217-tau), in CSF and plasma, that predicts AD prior to cognitive deficits. Understanding the role of pT217-tau is important in assessing efficacy of novel treatments aimed at early-stage disease. However, it is unknown why pT217-tau is effective in predicting brain pathology, as little is known about early, soluble pT217-tau brain expression.
View Article and Find Full Text PDFJ Craniofac Surg
January 2025
Department of Basic and Oral Biology, Ribeirão Preto School of Dentistry, University of São Paulo.
This cross-sectional observational study aimed to investigate the relationship between satisfaction with facial appearance among young women, as measured by the FACE-Q tool, and facial asymmetry quantified through stereophotogrammetry. A total of 50 women aged 18 to 30 years with a normal body mass index were recruited for the study. Participants were categorized as either symmetrical or asymmetrical based on facial asymmetry assessments obtained through clinical examination and stereophotogrammetry using the Vectra M3 system.
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