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Title: Palladium/N-heterocyclic carbene catalysed regio and diastereoselective reaction of ketones with allyl reagents via inner-sphere mechanism

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms11806· OSTI ID:1287338
 [1];  [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Chinese Academy of Sciences, Shanghai (China). State Key Laboratory of Organometallic Chemistry, Shanghai Instit. of Organic Chemistry
  2. Cornell University, Ithaca, NY (United States). Dept. of Chemistry and Chemical Biology, Baker Laboratory
  3. Chinese Academy of Sciences, Shanghai (China). State Key Laboratory of Organometallic Chemistry, Shanghai Instit. of Organic Chemistry and Shanghai Hong Kong Joint Laboratory in Chemical Synthesis

The palladium-catalysed allylic substitution reaction is one of the most important reactions in transition-metal catalysis and has been well-studied in the past decades. Most of the reactions proceed through an outer-sphere mechanism, affording linear products when monosubstituted allyl reagents are used. Here, we report an efficient Palladium-catalysed protocol for reactions of beta-substituted ketones with monosubstituted allyl substrates, simply by using N-heterocyclic carbene as ligand, leading to branched products with up to three contiguous stereocentres in a (syn, anti)-mode with excellent regio and diastereoselectivities. The scope of the protocol in organic synthesis has been examined preliminarily. As a result, mechanistic studies by both experiments and density functional theory ( DFT) calculations reveal that the reaction proceeds via an inner-sphere mechanism-nucleophilic attack of enolate oxygen on Palladium followed by C-C bond-forming [3,3']-reductive elimination.

Research Organization:
Chinese Academy of Sciences, Shanghai (China); Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001057
OSTI ID:
1287338
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 50 works
Citation information provided by
Web of Science

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A Mechanistic Analysis of the Palladium‐Catalyzed Formation of Branched Allylic Amines Reveals the Origin of the Regio‐ and Enantioselectivity through a Unique Inner‐Sphere Pathway journal September 2019
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Catalytic activity and facile recovery of a cyclometalated N‐heterocyclic carbene palladium(II) complex immobilized by non‐covalent interactions on reduced graphene oxide journal March 2019
Cationic [(Iminophosphine)Nickel(Allyl)] + Complexes as the First Example of Nickel Catalysts for Direct Hydroamination of Allenes journal January 2017
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Pd-catalyzed enantioselective cyclopropanation of nitriles with mono substituted allyl carbonates enabled by the bulky N-heterocyclic carbene ligand journal January 2019
Nucleophile Coordination Enabled Regioselectivity in Palladium‐Catalyzed Asymmetric Allylic C−H Alkylation journal November 2019