Ring Synthesis by Stereoselective, Methylene-Free Enyne Cross Metathesis
摘要:
Tandem enyne metathesis between 1-alkynes and 1,5-cyclooctadiene or all-cis-1,4-polybutadiene resulted in a direct, one-step ring synthesis of cyclohexadienes by methylene-free metathesis. The use of methylene-free metathesis conditions provided apparent Z-selectivity in the intermolecular enyne metathesis step.
Photoinduced Cobalt Catalysis for the Reductive Coupling of Pyridines and Dienes Enabled by Paired Single‐Electron Transfer**
作者:Jingyang Qin、Manuel Barday、Samikshan Jana、Nil Sanosa、Ignacio Funes‐Ardoiz、Christopher J. Teskey
DOI:10.1002/anie.202310639
日期:2023.11.6
A mild, regioselective method for the hydropyridylation of diene feedstocks is reported, and is amenable to late-stage-functionalisation. Experiments and DFT calculations suggest a mechanism involving non-reversible hydrogen atom transfer, resulting in a reaction that is uniquely selective for dienes in the presence of other olefins.
2-SUBSTITUTED-1,3-CYCLOHEXADIENES BY INTERMOLECULAR, METHYLENE-FREE TANDEM ENYNE METATHESIS
作者:Kulkarni, Amol A、Diver, Steven T.、Shibasaki, Masakatsu、Maki, Keisuke
DOI:10.15227/orgsyn.083.0200
日期:——
Palladium(II)-Catalyzed Intramolecular 1,4-Oxyacyloxylation of Conjugated Dienes. A Stereocontrolled Route to Fused Six-Membered Lactones and Pyrans
作者:Renzo C. Verboom、B. Anders Persson、Jan-E. Bäckvall
DOI:10.1021/jo0357667
日期:2004.4.1
Stereocontrolledpalladium(II)-catalyzed intramolecular 1,4-oxidations of dienyl acids and alcohols proceed under mild conditions to give fused δ-lactones and pyrans, respectively, in good yields. The stereo- and regioselectivity was affected by the presence of LiCl and solvent composition (HOAc/acetone). The products obtained were used for further functionalizations using copper(I)-mediated reactions
Ring Synthesis by Stereoselective, Methylene-Free Enyne Cross Metathesis
作者:Amol A. Kulkarni、Steven T. Diver
DOI:10.1021/ja0476922
日期:2004.7.1
Tandem enyne metathesis between 1-alkynes and 1,5-cyclooctadiene or all-cis-1,4-polybutadiene resulted in a direct, one-step ring synthesis of cyclohexadienes by methylene-free metathesis. The use of methylene-free metathesis conditions provided apparent Z-selectivity in the intermolecular enyne metathesis step.