A practical and effective copper-catalyzed dehydrogenative Diels–Alderreaction of gem-diesters and ketone with dienes has been established. The active dienophiles were generated in situ via a radical-based dehydrogenation process, which reacted with a wide variety of dienes to afford various polysubstituted cyclohexene derivatives in good to excellent yields.
Generation of Stoichiometric Ethylene and Isotopic Derivatives and Application in Transition‐Metal‐Catalyzed Vinylation and Enyne Metathesis
作者:Geanna K. Min、Klaus Bjerglund、Søren Kramer、Thomas M. Gøgsig、Anders T. Lindhardt、Troels Skrydstrup
DOI:10.1002/chem.201303668
日期:2013.12.16
Ethylene is one of the most important buildingblocks in industry for the production of polymers and commodity chemicals. 13C‐ and D‐isotope‐labeled ethylenes are also valuable reagents with applications ranging from polymer‐structure determination, reaction‐mechanism elucidation to the preparation of more complex isotopically labeled compounds. However, these isotopic derivatives are expensive, and
Novel 1,3-diene synthesis from alkyne and ethylene by ruthenium-catalyzed enyne metathesis
作者:Atsushi Kinoshita、Norikazu Sakakibara、Miwako Mori
DOI:10.1016/s0040-4020(99)00297-5
日期:1999.7
A novel 1,3-diene synthetic method fromalkyne and ethylene was developed using ruthenium-catalyzed enyne metathesis. The reaction procedure is very simple: A CH2Cl2 solution of alkyne was stirred at room temperature under ethylene gas (1 atm.) in the presence of a catalytic amount of ruthenium benzylidene complex. The yield was good and the conversion yield was high. Dienes having functional groups
Improved yne–enecrossmetathesis with a 4,5-dihydroimidazolin-2-ylidene ruthenium benzylidene complex is described. The N-heterocyclic carbene ligands complex 2 shows significantly increased activity in the case of sterically hindered olefins when compared to 1. Even disubstituted triple bonds are transformed into 1,2,3-trisubstituted-1,3-dienes.
New strategy to construct fused/bridged/spiro carbocyclic scaffolds based on the design of novel 6-C synthon precursor
作者:Jia Liu、Xi Wang、Chang-Liang Sun、Bi-Jie Li、Zhang-Jie shi、Min Wang
DOI:10.1039/c0ob00660b
日期:——
In this article we report a new strategy to build fused/spiro/bridged carbocyclic systems with a novel 6-C synthon from readily available diallyl diacetates through the sequential Pd-catalyzed double allyl alkylation and Diels–Alder annulation. Further exploration on the application of this strategy can construct useful complex scaffolds.