Photochemically catalyzed ring opening of oxiranecarbonitriles and [3+2] cycloaddition with olefins: synthesis of polysubstituted tetrahydrofurans
作者:Jinhui Pan、Wei Zhang、Jie Zhang、Shenci Lu
DOI:10.1016/j.tetlet.2007.02.014
日期:2007.4
Photoinduced electron transfer catalyzed ringopening of aryl-substituted oxiranecarbonitriles via Cβ–O bond cleavage was achieved using 2,4,6-triphenylpyrylium tetrafluoroborate (TPT) as a sensitizer and subsequent [3+2] cycloaddition reaction with electron-rich olefins afforded polysubstituted tetrahydrofurans in good to moderate yields.
Experimental and theoretical study of the [3 + 2] cycloaddition of carbonyl ylides with alkynes
作者:Ghenia Bentabed-Ababsa、Samira Hamza-Reguig、Aïcha Derdour、Luis R. Domingo、José A. Sáez、Thierry Roisnel、Vincent Dorcet、Ekhlass Nassar、Florence Mongin
DOI:10.1039/c2ob26442k
日期:——
The [3 + 2] cycloaddition reaction between carbonyl ylides generated from epoxides and alkynes (phenylacetylene, methylpropiolate, methyl but-2-ynoate and methyl 3-phenylpropiolate) to give substituted 2,5-dihydrofurans was investigated. The effect of indium(III) chloride on the outcome of the reaction was studied in the case of phenylacetylene and methylpropiolate. The thermal reaction between the
Addition des ylures de carbonyle derives de gem-dicyanoepoxydes sur les benzylidene anilines substituees
作者:A. Robert、J.J. Pommeret、E. Marchand、A. Foucaud
DOI:10.1016/s0040-4020(01)93318-6
日期:1973.1
The reaction of substituted benzylidene anilines with 1,1-dicyano or 1-cyano 1-ethoxycarbonyl epoxides gives oxazolidines, the structures of which is established by NMR spectroscopy. The formation of oxazolidines proceeds via regiospecific addition of epoxide derived ylid to imine. The influence of ylid substituants and imine substituants on the reaction may be interpreted by interactions of the frontier
Gem dicyano époxydes équivalents synthétiques des dications cétènes : synthése de thiazolidinone-4 par réaction avec des thiourées substituées et évolution particulière en (aryl-cyanoformyl) méthylène-2 benzoxazole par réaction avec le thioxo-2 benzoxazole
作者:A.Majcen Le Maréchal、A. Robert、I. Leban
DOI:10.1016/s0040-4020(01)85429-6
日期:1990.1
The nucleophilic ring opening of gem dicyano epoxides by N-substituted or N-N' disubstituted thioureas leads to 2-imino 4-thiazolidinones, via postulated cyanoformyl intermediates, compounds 7 can exist in tautomeric equilibrium with a tautomeric 2-amino 4-hydroxy thiazolines. However, the cyanoformyl intermediates evolve differently when dicyano epoxides are reacted with 2-thioxobenzoxazole, 2-(aryl
Facile Epoxidation of Alumina-Supported Electrophilic Alkenes and Montmorillonite-Supported Electrophilic Alkenes with Sodium Hypochlorite
作者:André Foucaud、Médard Bakouetila
DOI:10.1055/s-1987-28104
日期:——
Alkenes gem-substituted by two electron-withdrawing substituents, dispersed on alumina or montmorillonite, are conveniently epoxided by sodium hypochlorite. A mixture of aldehyde and methylcyanoacetate or malononitrile, treated with alumina and sodium hypochlorite gives the corresponding epoxide in good yield.