The well-defined iron(0) complex [(DPB)Fe-(μ-1,2-N)] (A) reacts with HBpin to afford the complex [(-HDPB)Fe(-HBpin)] (B) oxidative addition of the H-B bond. Complex A is an effective pre-catalyst for the hydroboration of a range of olefins in synthetically useful yields (typically >80%) under neat conditions.
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http://dx.doi.org/10.1039/d3cc00494e | DOI Listing |
Org Lett
January 2025
Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China.
A 1,1-hydroboration of alkynylgermanes with unique -Ge/B stereochemistry under transition-metal-free conditions is reported. Mechanistic studies suggest that a pathway involving α-boration followed by a stepwise 1,2-Ge/H shift on the intermediate structurally lies between an alkyne-Ge π complex and a typical vinyl cation. The resulting Ge/B bimetallic modules, along with a /Ge/B trimetallic variant, can be conveniently transformed into trisubstituted olefins through iterative divergent cross-coupling.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Centre for Nano and Material Sciences (CNMS), Jain University, Jain Global Campus, Bangalore, 562112, India.
The development of a metallic copper-based catalyst system remains a significant challenge. Herein, we report the synthesis of highly stable, active, and reusable Cu catalyst for the carboboration of alkynes using carbon electrophiles and bis(pinacolato)diboron (Bpin) as chemical feedstocks to afford di- and trisubstituted vinylboronate esters in a regio- and stereoselective manner with appreciable turnover number (TON) of up to 2535 under mild reaction conditions. This three-component coupling reaction works well with a variety of substituted electrophiles and alkynes with broad functional group tolerance.
View Article and Find Full Text PDFJ Org Chem
January 2025
School of Pharmaceutical Science, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China.
Although the radical hydroboration of alkenes with N-heterocyclic carbene (NHC) borane is well documented, the radical hydroboration of alkynes, especially terminal alkynes, remains challenging. Herein, a photoredox-catalyzed radical -hydroboration of alkynes with NHC borane has been developed, which provided various alkenyl boron compounds in moderate to good yields. This protocol exhibits a broad substrate scope, as both internal and terminal alkynes were compatible.
View Article and Find Full Text PDFJ Am Chem Soc
January 2025
Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.
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.
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