Isocyano Enones: Addition–Cyclization Cascade to Oxazoles
作者:Allen Chao、J. Armando Lujan-Montelongo、Fraser F. Fleming
DOI:10.1021/acs.orglett.6b01147
日期:2016.7.1
Copper iodide catalyzes the conjugate addition of organometallic and heteroatom nucleophiles to isocyano enones to afford oxazoles. A range of enolates, metalated nitriles, amines, and thiols undergo catalyzed conjugate addition to cyclic and acyclic oxoalkene isocyanides. Mechanistic studies suggest that copper complexation facilitates the nucleophilic attack on the isocyano enone to generate an enolate
pyrrole formation by the reaction of vinylazides with 1,3-dicarbonyl compounds via the 1,2-addition of 1,3-dicarbonyl compounds to 2H-azirine intermediates generated in situ from vinylazides; (ii) the Cu(II)-catalyzed synthesis of pyrroles from alpha-ethoxycarbonyl vinylazides and ethyl acetoacetate through the 1,4-addition reaction of the acetoacetate to the vinylazides. By applying these two methods
A novel synthesis of α-azidocinnamates, α-azido-α,β-unsaturated ketones and β-azidostyrenes mediated by cerium(IV) ammonium nitrate
作者:Vijay Nair、Tesmol G George
DOI:10.1016/s0040-4039(00)00350-6
日期:2000.4
Cerium(IV) ammonium nitrate mediated addition of azide to cinnamic esters, acids and α,β-unsaturatedketones, followed by reaction with sodium acetate afforded the α-azidocinnamates, β-azidostyrenes and α-azido-α,β-unsaturatedketones, respectively, in good yields.