iron-catalyzed olefin oxyamidation by utilizing tethered dioxazolones as the nitrenoid precursor to produce valuable β-lactam scaffolds. Mechanistic studies revealed that a relatively strong π-accepting ability of the phthalocyanine ligand is critical in generating the key triplet iron-imidyl radical intermediate to enable the 4-exo-trig-lactamization with the incorporation of oxygen nucleophiles in
The organoselenium-induced ring-closure reactions of γ-substituted β, γ-unsaturated hydroxamic acids afforded cyclic phenylseleno N-hydroxy imidates or phenylseleno N-hydroxy γ-lactams as the kinetically or thermodynamically controlled products, respectively.
New Preparation of (<i>Z</i>)-1-Phenyl-3-cyano-2-propen-1-ones
作者:Houssam Trabulsi、Gérard Rousseau
DOI:10.1080/00397911.2010.497598
日期:2011.7.15
Abstract Reaction of γ-phenyl-β,γ-unsaturated hydroxamates with bis(collidine)bromine(I) hexafluorophosphate led to the formation of cyclic bromo imidates. Reaction of these with triethylamine led to the formation of 3-cyano-2-propen-1-ones with good yields by a fragmentation reaction.