A method for synthesizing chiral oxazolidinone scaffolds from readily available oxabicyclic alkenes is described. The reaction utilizes a domino sequence of Rh(I)-catalyzed asymmetric ring-opening (ARO) with sodium cyanate as a novel nucleophile followed by intramolecular cyclization to generate oxazolidinone products in excellent enantioselectivities (trans stereochemistry).
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1021/ol4000668 | DOI Listing |
J Org Chem
November 2024
Centre for Synthesis and Chemical Biology, School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
The preparation of a focused library of chiral 2-amido and 2-amido-1-phenyl-1,3-dienes from a range of chiral oxazolidinones using palladium-catalysis is reported. This palladium-catalyzed carbon-nitrogen bond-forming reaction provides the corresponding chiral amido-dienes in moderate to excellent yields (12 examples, up to 97%). The resulting chiral amido-dienes are employed as novel dienes in Diels-Alder (DA) reactions (58 examples, up to 93:7 dr, up to 70% yield).
View Article and Find Full Text PDFACS Catal
September 2024
Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States.
Modular, catalytic, and stereoselective methods for the dicarbofunctionalization of alkenes can streamline the synthesis of chiral active pharmaceutical ingredients (APIs) and agrochemicals. However, despite the inherent attractive properties of iron as catalysts for practical pharmaceutical synthesis (i.e.
View Article and Find Full Text PDFOrg Lett
August 2024
Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Matthews Ave, Urbana, Illinois 61801, United States.
An operationally simple method for generating enantioenriched 2-oxazolidinones from -Boc amines and mono- or disubstituted alkenes via chiral organoselenium catalysis is described. Critical to the success of the transformation was the inclusion of triisopropylsilyl chloride (TIPSCl), likely because it sequestered fluoride generated by the oxidant (-fluorocollidinium tetrafluoroborate) throughout the reaction and suppressed side reactivity. The scope of both the amine and alkene substrates was explored, generating a variety of 2-oxazolidinones in modest to high yields with high enantioselectivities.
View Article and Find Full Text PDFJACS Au
May 2024
Chemistry Program, New York University Abu Dhabi (NYUAD), Saadiyat Island, Abu Dhabi 129188, United Arab Emirates (UAE).
The observation of thioester-mediated acyl transfer processes in nature has inspired the development of novel protein synthesis and functionalization methodologies. The chemoselective transfer of an acyl group from -to- is the basis of several powerful ligation strategies. In this work, we sought to apply the reverse process, the transfer of an acyl group from -to-, as a method to convert stable chiral amides into more reactive thioesters.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
July 2024
State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Dalian University of Technology, Dalian, 116024, China.
The introduction of nitrogen-containing functional groups to chiral polymer backbones enables the tailoring of physical properties and offers opportunities for further post-polymerization modification. However, the substrate scope of such polymers is extremely limited because monomers having nitrogen-containing groups can change coordination state with respect to the metal centers, thus decreasing the activity and enantioselectivity and even poisoning the catalyst completely. In this paper, we report our attempts to carry out the asymmetric copolymerization of meso-epoxide with highly reactive isocyanates.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!