Synthesis of oxygen spirocycles by manganic acetate promoted additions to exocyclic enol ether derivatives
作者:John M. Mellor、Shahid Mohammed
DOI:10.1016/0040-4039(91)85053-8
日期:1991.11
Oxidative addition, promoted by manganic acetate, of β-dicarbonyl compounds to enol lactones and related enol derivatives having an exocyclic double bond affords spirocyclic products, and addition to endocyclic enolethers gives fused acetals and ketals.
Cu(I)-Catalyzed Intramolecular C−C Coupling of Activated Methylene Compounds with Vinyl Halides: Efficient Synthesis of Functionalized Alkylidenecyclobutanes
作者:Liqun Chen、Min Shi、Chaozhong Li
DOI:10.1021/ol802012q
日期:2008.11.20
With the catalysis of CuI/L-proline, a number of 2-(3-bromobut-3-enyl)malonates underwent efficient intramolecularC-vinylation leading to the synthesis of functionalized alkylidenecyclobutanes. Competition experiments revealed that this four-membered ring closure is fundamentally preferred over the corresponding five-membered ring closure.
Synthesis of spirocyclic acetals by manganic acetate promoted additions to exocyclic enol ethers
作者:John M. Mellor、Shahid Mohammed
DOI:10.1016/s0040-4020(01)87231-8
日期:1993.8
Reaction of β-ketoesters and β-dicarbonyl compounds with manganic acetate in acetic acid gives intermediates, which add to exocyclic enolethers to afford a variety of interesting spirocyclic acetals. As the exocyclic enolethers are shown to be readily accessible, the results constitute a useful route based on radical chemistry to the synthesis of unsaturated spiroacetals.