98%
921
2 minutes
20
The Gabriel amine synthesis is a textbook method for the preparation of primary amines from alkyl halides. In this work, we demonstrate a Gabriel amine synthesis with iodo-bicyclopentanes to make aminomethyl bicyclobutanes. DFT studies support the concerted rearrangement of a bicyclo[1.1.1]pentyl to a bicyclo[1.1.0]butyl carbocation, initiated by a carbon-halide dissociation. A carboxamide substituent stabilizes the carbocation intermediate with anchimeric assistance.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1021/acs.joc.5c00043 | DOI Listing |
Brain Res Bull
September 2025
Department of Electrical, Electronic, and Information Engineering "Guglielmo Marconi", University of Bologna, Cesena, Italy.
The hippocampus' ability to encode new information while simultaneously avoiding disruptive interference poses a fundamental challenge to cognitive neuroscience. It has been supposed that dynamical changes in acetylcholine (ACh), a neurotransmitter involved in learning and memory, can facilitate a shifting between encoding and retrieval: high ACh levels promote encoding by enhancing synaptic plasticity while concurrently suppressing retrieval-related networks; low ACh levels favor retrieval, suppressing external inputs and synaptic potentiation. The primary source of ACh in the hippocampus, the medial septum/diagonal band of Broca, is also a key determinant of hippocampal theta: these two aspects could therefore be integrated, with ACh and theta fluctuations modulating encoding and retrieval phases.
View Article and Find Full Text PDFSci Rep
July 2025
Istituto di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, Via Campi Flegrei 34, Pozzuoli (Napoli), 80078, Italy.
N-palmitoyl-D-glucosamine (PGA) belongs to the class of molecules known as Autacoid Local Injury Antagonism (ALIA)-amides, whose parent compound is N-palmitoyl-ethanolamine (PEA) an endocannabinoid-like mediator belonging to the expanded endocannabinoid system (the endocannabinoidome). The mechanism of action of ALIA-amides is mainly targeted at the down-regulation of the hyperactivity of peripheral mast cells and non-neuronal cells of the central nervous system. This study aimed to investigate if PGA is able to produce the typical "entourage" effect of PEA, consisting of increasing the endogenous levels of the endocannabinoids anandamide (AEA) and 2-arachidonoylglycerol (2-AG), and to also elevate endogenous PEA levels.
View Article and Find Full Text PDFMater Horiz
June 2025
The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), National Key Laboratory of Advanced Polymer Materials, College of Chemistry, Sichuan University, Chengdu, 610064, China. l.ch
Carbon fiber-reinforced epoxy composites, extensively used in high-performance applications, face significant challenges regarding their recyclability and fire safety. Phosphorus-containing dynamic covalent chemistry offers an effective strategy to address these issues. However, integrating these bonds into either the starting resins or curing agents of epoxy systems typically necessitates complex multi-step syntheses, leading to economic concerns.
View Article and Find Full Text PDFPET Clin
July 2025
Interdisciplinary Center for Health Sciences, Scuola Superiore Sant'Anna, Pisa 56127, Italy; Fondazione Toscana Gabriele Monasterio, Pisa 56125, Italy.
PET has recently demonstrated promising capabilities in the diagnosis and differentiation of various forms of CA. Tracers labeled with 18F, such as 18F-flutemetamol, 18F-florbetapir, and 18F-florbetaben, are being increasingly researched due to their extended half-life, eliminating the requirement for on-site cyclotrons. Unlike bone tracers, PET amyloid-binding tracers exhibit a higher affinity for light-chain fibrils, potentially enabling accurate differentiation between various types of CA.
View Article and Find Full Text PDF