Palladium-Catalyzed Asymmetric Tandem Carbonylation-Heck Reaction of Cyclopentenes to Access Chiral Bicyclo[3.2.1]octenes.

Org Lett

State Key Laboratory of Natural Medicines (SKLNM) and Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, P. R. China.

Published: October 2024

AI Article Synopsis

  • A new reaction involving palladium catalyst has been developed that combines carbonylation and Heck reactions specifically targeting cyclopentenes with carbon monoxide.
  • This method successfully produces bicyclo[3.2.1]octenes that have both a chiral quaternary carbon and a tertiary carbon, achieving good yields and enantioselectivity.
  • The mechanism includes the formation of an acyl-palladium intermediate, followed by the alkenes migrating into the reaction.

Article Abstract

A palladium-catalyzed asymmetric tandem carbonylation-Heck reaction of cyclopentenes with carbon monoxide (CO) has been disclosed. This desymmetrization procedure afforded a series of bicyclo[3.2.1]octenes with one chiral quaternary and one tertiary carbon center in good yields with good enantioselectivities. This reaction proceeds via an acyl-palladium intermediate, followed by migratory insertion of the alkenes.

Download full-text PDF

Source
http://dx.doi.org/10.1021/acs.orglett.4c02719DOI Listing

Publication Analysis

Top Keywords

palladium-catalyzed asymmetric
8
asymmetric tandem
8
tandem carbonylation-heck
8
carbonylation-heck reaction
8
reaction cyclopentenes
8
cyclopentenes access
4
access chiral
4
chiral bicyclo[321]octenes
4
bicyclo[321]octenes palladium-catalyzed
4
cyclopentenes carbon
4

Similar Publications

Catalytic asymmetric C-N cross-coupling towards boron-stereogenic 3-amino-BODIPYs.

Nat Commun

January 2025

Shenzhen Grubbs Institute and Department of Chemistry, Shenzhen Key Laboratory of Small Molecule Drug Discovery and Synthesis, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, Guangdong, China.

3-Amino boron dipyrromethenes (BODIPYs) are a versatile class of fluorophores widely utilized in live cell imaging, photodynamic therapy, and fluorescent materials science. Despite the growing demand for optically active BODIPYs, the synthesis of chiral 3-amino-BODIPYs, particularly the catalytic asymmetric version, remains a challenge. Herein, we report the synthesis of boron-stereogenic 3-amino-BODIPYs via a palladium-catalyzed desymmetric C-N cross-coupling of prochiral 3,5-dihalogen-BODIPYs.

View Article and Find Full Text PDF

Palladium-Catalyzed Enantioselective Cyclization of 1,6-Enynes to Access Chiral γ-Butyrolactam.

J Org Chem

January 2025

Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China.

A palladium-catalyzed asymmetric chlorocyclization of 1,6-enynes has been described. Controlling the chloride ion concentration in the system by substrate design is the key to achieving asymmetric chlorinated cyclization. In the presence of Pd(PhCN)Cl and chiral phosphoramidite ligands, the reaction accesses diverse chiral ()-α-chloromethylene-γ-butyrolactams with excellent selectivity and enantioselectivity.

View Article and Find Full Text PDF

Optically active spirocycles were prepared in a sequence of two palladium-catalyzed reactions. In the first step, racemic α-(-iodophenyl)-β-oxo allyl esters were submitted to the palladium-catalyzed decarboxylative asymmetric allylic alkylation reaction, furnishing the α-allylated products with a quaternary stereocenter with good yields and enantioselectivities. Subsequently, these intermediate products were converted in a Heck reaction yielding the spirocyclic structures as a mixture of - and -cyclic regioisomers.

View Article and Find Full Text PDF

Tailored chiral phosphoramidites support highly enantioselective Pd catalysts for asymmetric aminoalkylative amination.

Nat Commun

December 2024

Key Laboratory of Precision and Intelligent Chemistry and Department of Chemistry, University of Science and Technology of China, 230026, Hefei, P. R. China.

Even though tuning electronic effect of chiral ligands has proven to be a promising method for designing efficient catalysts, the potential to achieve highly selective reactions by this strategy remains largely unexplored. Here, we report a palladium-catalyzed enantioselective ring-closing aminoalkylative amination of aminoenynes enabled by rationally tuning the remote electronic property of 1,1'-binaphthol-derived phosphoramidites. With a tailored 6,6'-CN-substituted 1,1'-binaphthol-derived phosphoramidite as a ligand, a broad range of aromatic amines are compatible with this reaction, allowing the efficient synthesis of a series of enantioenriched exocyclic allenylamines bearing saturated N-heterocycles with up to >99% enantiomeric excess.

View Article and Find Full Text PDF

Concise Asymmetric Total Syntheses of (+)-Dihydropleurotinic Acid and (-)-Pleurotin, Enabling Rapid Late-Stage Diversification.

JACS Au

November 2024

Laboratory of Medicinal Chemical Biology, Department of Medicinal Chemistry, College of Pharmaceutical Sciences, Soochow University, 199 Ren'ai Road, Suzhou 215123, China.

(-)-Pleurotin () and (+)-dihydropleurotinic acid () are benzoquinone meroterpenoids isolated from fungal sources with powerful antitumor and antibiotic activities. Concise asymmetric total syntheses of the stereochemically pure (+)-dihydropleurotinic acid () and (-)-pleurotin () from the chiral pool ()-Roche ester-derived vinyl bromide have been achieved in 12 and 13 longest linear steps, respectively. The key transformations feature a Michael addition/alkylation cascade reaction to forge three contiguous stereocenters matched with the natural products, a PtO-catalyzed stereoselective reduction of olefin to generate the correct stereocenter at C3, a palladium-catalyzed Negishi cross-coupling between triflate and zinc reagent to introduce the redox-sensitive para-quinone moiety, and a hydroboration/copper-catalyzed carboxylation sequence to incorporate the vital carboxyl group.

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!