Nickel-catalyzed [3 + 2] Cycloaddition of α,β-Unsaturated Ketones with Vinyl Oxiranes
作者:Saori Sako、Takuya Kurahashi、Seijiro Matsubara
DOI:10.1246/cl.2011.808
日期:2011.8.5
A nickel-catalyzed cycloaddition of α,β-unsaturated ketones with vinyl oxiranes to afford polysubstituted tetrahydrofurans has been developed. The key intermediate is a five-membered nickelacycle, ...
Preparation of lactones via tricarbonyliron–lactone complexes
作者:Gary D. Annis、Steven V. Ley、Christopher R. Self、Ramamoorthy Sivaramakrishnan
DOI:10.1039/p19810000270
日期:——
A number of tricarbonyliron–lactonecomplexes have been prepared from vinyl oxirans by treatment with pentacarbonyliron. In certain cases two η3-allyl complexes were isolated from a single vinyl oxiran. Oxidation of the complexes by cerium(IV) ammonium nitrate in acetonitrile leads predominantly to β-lactones. The stereochemical integrity of the initial complexes is reflected in the formation of the