A palladium-catalyzed (3 + 2) cycloaddition of vinyl cyclopropane and α,β-unsaturated imines generated in situ from aryl sulfonyl indoles is reported. The reaction proceeds with high diastereoselectivity to provide the optically enriched spirocyclopentane-1,3'-indolenines in up to 74% yield and with up to 97% ee, which contains an all-carbon quaternary center and two tertiary stereocenters. The reaction involves a first conjugate addition of the carbon anion of zwitterionic π-allylpalladium complex from vinyl cyclopropane to the in situ formed unsaturated imine followed by a palladium-catalyzed intramolecular C3-allylation of indole.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/ol503383x | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Exosome miR-199a-5p modulated vascular remodeling and inflammatory infiltration of Takayasu's arteritis.
Arthritis Res Ther
January 2025
Department of Rheumatology and Clinical Immunology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China.
Background: Advances in treatment have swiftly alleviated systemic inflammation of Takayasu's arteritis (TAK), while subclinical vascular inflammation and the ensuing arterial remodeling continue to present unresolved challenges in TAK. The phenotypic switching of vascular smooth muscle cells (VSMC) is regarded as the first step in vascular pathology and contributes to arterial remodeling. Exosomes facilitate the transfer and exchange of proteins and specific nucleic acids, thereby playing a significant role in intercellular communication.
View Article and Find Full Text PDFThrough-Space Charge Transfer Dynamic Mechanism in V-Shaped Flexible Carbazole Aromatic Imides Dyads.
Chemistry
January 2025
Beijing University of Posts and Telecommunications, School of Science, Beijing, CHINA.
Cofacial electron donor-acceptor dyads exhibiting through-space charge-transfer (TSCT) characteristics are widely employed in the development of optoelectronic functional materials. The flexible molecular frameworks between the electron donor and acceptor components allow dynamic modulation of electronic coupling, influenced by excited-state structural relaxation or intermolecular interactions, thereby affecting the charge-transfer (CT) dynamics and the emission properties of TSCT states. In this work, we examine the TSCT dynamic processes of two electron donor-acceptor dyads, CzPhNI and CzPhPI formed by ortho-substitution of phenyl linkage with V-shaped flexible TSCT structures using carbazole as donor and naphthalimide or phthalimide as acceptor.
View Article and Find Full Text PDFCatalytic effects of multiple heterointerfaces on the hydrogen storage properties of magnesium hydride.
J Colloid Interface Sci
January 2025
State Key Laboratory of Silicon and Advanced Semiconductor Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310058, China. Electronic address:
The application and further industrialization of magnesium hydride (MgH) are restricted by its intrinsically high de-hydrogenation temperature and dragged kinetics though it is believed as one of the most encouraging solid-state hydrogen storage materials with considerable capacity. Herein, a bimetallic layered MXene VNbC, which was mixed with MgH by high energy ball milling, was obtained by etching compact layered MAX VNbAlC with HF. The beginning de-hydrogenation temperature of the as-prepared MgH blended with 10 wt% VNbC (denoted as MgH-10 VNbC) composites was excitingly 170 °C and it exhibited faster kinetics and excellent cycling stability.
View Article and Find Full Text PDFA Ring-Shaped Lithium Metal Anode Enables High-Performance All-Solid-State Batteries Revealed by In Situ L-Band EPR Imaging.
J Phys Chem Lett
January 2025
Shanghai Key Laboratory of Magnetic Resonance, Institute of Magnetic Resonance and Molecular Imaging in Medicine, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, P. R. China.
In traditional operations of all-solid-state lithium metal batteries (ASSLMBs), a small thin lithium metal circular disk is employed as a lithium metal anode (LMA). However, ASSLMBs with a circular-disk LMA often fail in <150 cycles with low capacity retention. In this work, we developed a new ring-shaped LMA to improve cyclability.
View Article and Find Full Text PDFSprayable Hydrogel for pH-Responsive Nanozyme-Derived Bacteria-Infected Wound Healing.
ACS Appl Mater Interfaces
January 2025
School of Chemistry & Materials Science, Jiangsu Normal University, 101 Shanghai Road, Xuzhou 221116, P. R. China.
Long-term inflammation and persistent bacterial infection are primary contributors to unhealed chronic wounds. The use of conventional antibiotics often leads to bacteria drug resistance, diminishing wound healing effectiveness. Nanozymes have become a promising alternative to antimicrobial materials due to their low cost, easy synthesis, and good stability.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!