Synthesis of α-alkylated γ-butyrolactones with concomitant anhydride kinetic resolution using a sulfamide-based catalyst.

Org Biomol Chem

School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin 152-160, Pearse Street, Dublin 2, Ireland.

Published: November 2018

The Kinetic Resolution (KR) of α-alkylated enolisable disubstituted anhydrides has been shown to be possible for the first time. In the presence of an ad hoc designed novel class of bifunctional sulfamide organocatalyst, a regio-, diastereo- and enantioselective cycloaddition reaction between the enolisable anhydride and benzaldehydes provides densely functionalised γ-butyrolactones in one pot (up to 19 : 1 dr, 94% ee) with control over three contiguous stereocentres. The concomitant resolution of the starting material anhydride, provides access to a range of chiral succinate derivatives with selectivity factors up to S* = 10.5.

Download full-text PDF

Source
http://dx.doi.org/10.1039/c8ob02248hDOI Listing

Publication Analysis

Top Keywords

kinetic resolution
8
synthesis α-alkylated
4
α-alkylated γ-butyrolactones
4
γ-butyrolactones concomitant
4
concomitant anhydride
4
anhydride kinetic
4
resolution sulfamide-based
4
sulfamide-based catalyst
4
catalyst kinetic
4
resolution α-alkylated
4

Similar Publications

Catalytic Enantioselective Nucleophilic Amination of α-Halo Carbonyl Compounds with Free Amines.

J Am Chem Soc

December 2024

Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration & Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 999077, China.

Catalytic enantioselective substitution of the readily available racemic α-halo carbonyl compounds by nitrogen nucleophiles represents one of the most convenient and direct approaches to access enantioenriched α-amino carbonyl compounds. Distinct from the two available strategies involving radicals and enolate ions, herein we have developed a new protocol featuring an electronically opposite way to weaken/cleave the carbon-halogen bond. A suitable chiral anion-based catalyst enables effective asymmetric control over the key positively charged intermediates.

View Article and Find Full Text PDF

High-visual-resolution colorimetric immunoassay with attomolar sensitivity using kinetically controlled growth of Ag in AuAg nanocages and poly-enzyme-boosted tyramide signal amplification.

Talanta

December 2024

Marshall Laboratory of Biomedical Engineering, Shenzhen Key Laboratory for Nano-Biosensing Technology, Department of Biomedical Engineering, Medical School, Shenzhen University, Shenzhen, Guangdong, 518060, PR China. Electronic address:

Colorimetric enzyme-linked immunosorbent assays (CELISAs) have long been used for protein biomarker detection in diagnostics. Unfortunately, as confined by the monochromatic nature of detection signals and the limited catalytic activity of enzymes, CELISAs suffer from poor visual resolution and low sensitivity, hindering their effectiveness for early diagnostics in resource-limited settings. Herein, we report an ultrasensitive, high-visual-resolution CELISA (named PE-TSA-AuAg Cage-CELISA) that combines kinetically controlled growth of Ag in AuAg nanocages with poly-enzyme-boosted tyramide signal amplification (PE-TSA), enabling visual semiquantitative detection of protein biomarkers at attomolar levels with the naked eye.

View Article and Find Full Text PDF

Boron Designer Enzyme with a Hybrid Catalytic Dyad.

ACS Catal

December 2024

Stratingh Institute for Chemistry, University of Groningen, Groningen 9747 AG, The Netherlands.

Genetically encoded noncanonical amino acids can introduce new-to-nature activation modes into enzymes. While these amino acids can act as catalysts on their own due to their inherent chemical properties, interactions with adjacent residues in an enzyme, such as those present in natural catalytic dyads or triads, unlock a higher potential for designer enzymes. We incorporated a boron-containing amino acid into the protein scaffold RamR to create an active enzyme for the kinetic resolution of α-hydroxythioesters.

View Article and Find Full Text PDF

Unraveling Serial Degradation Pathways of Supported Catalysts through Reliable Electrochemical Liquid-Cell TEM Analysis.

J Am Chem Soc

December 2024

Department of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea.

Electrochemical liquid-cell transmission electron microscopy (e-LCTEM) offers great potential for investigating the structural dynamics of nanomaterials during electrochemical reactions. However, challenges arise from the difficulty in achieving the optimal electrolyte thickness, leading to inconsistent electrochemical responses and limited spatial resolution. In this study, we present advanced e-LCTEM techniques tailored for tracking Pt/C degradation under electrochemical polarization at short intervals with high spatial resolution.

View Article and Find Full Text PDF

Single-Molecule Observation of Competitive Protein-Protein Interactions Utilizing a Nanopore.

ACS Nano

December 2024

Department of Physics, Syracuse University, 201 Physics Building, Syracuse, New York 13244-1130, United States.

Two or more protein ligands may compete against each other to interact transiently with a protein receptor. While this is a ubiquitous phenomenon in cell signaling, existing technologies cannot identify its kinetic complexity because specific subpopulations of binding events of different ligands are hidden in the averaging process in an ensemble. In addition, the limited time resolution of prevailing methods makes detecting and discriminating binding events among diverse interacting partners challenging.

View Article and Find Full Text PDF

Want 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!