Reactions of electron-withdrawing thiophene 1,1-dioxides with furans. A novel reaction pathway
作者:A. M. Moiseev、E. S. Balenkova、V. G. Nenajdenko
DOI:10.1007/s11172-006-0318-8
日期:2006.4
Reactions of thiophenedioxides containing electron-withdrawing substituents with furans were studied. The reactions with unsubstituted furan followed the inverse-electron-demand Diels-Alder mechanism. Subsequent elimination of sulfur dioxide from the adduct afforded products of the tetrahydrobenzofuran series. The reactions with substituted furans gave benzylcarbonyl compounds in high yields. The
A facile route to thiophene-1,1-dioxides bearing electron-withdrawing groups
作者:Valentine G Nenajdenko、Andrew E Gavryushin、Elizabeth S Balenkova
DOI:10.1016/s0040-4039(01)00732-8
日期:2001.6
thiophene-1,1-dioxides with strong EWGs has been described to date. Trifluoroperacetic acid in acetonitrile in the absence of water is shown to oxidise thiophenes, including examples possessing an electron-withdrawinggroup such as sulfonyl or alkoxycarbonyl. An easy and ready for scale-up procedure is developed, some formerly unknown thiophene-1,1-dioxides are obtained.
Chemo-, regio- and stereoselective Diels–Alder reactions of EWG bearing thiophene-1,1-dioxides
作者:Valentine G. Nenajdenko、Andrew M. Moiseev、Elizabeth S. Balenkova
DOI:10.1016/j.tet.2005.09.006
日期:2005.11
EWG-containing thiophene-1,1-dioxides were found to be very active dienophiles in reactions with 1,3-dienes to afford corresponding cycloadducts in mild conditions. A chemo-, regio- and stereoselective cycloaddition was observed. Reaction resulted in formation of derivatives of tetrahydrobenzothiophene-1,1-dioxides in high yields.
[6+4] Cycloaddition reactions of acceptor thiophene dioxides: The synthesis of substituted azulenes
作者:A. M. Moiseev、E. S. Balenkova、V. G. Nenajdenko
DOI:10.1007/s11172-006-0227-x
日期:2006.1
Abstract[6+4] Cycloaddition reactions of functionalized thiophene dioxides with various fulvenes provided the corresponding azulenes. The observed regiochemistry was explained in terms of the HOMO—LUMO orbital coefficients.
EWG-containing thiophene- and 2-thiolene-1,1-dioxides as promising electrophiles for organic synthesis
作者:Andrew M. Moiseev、Elizabeth S. Balenkova、Valentine G. Nenajdenko
DOI:10.1070/mc2006v016n04abeh002355
日期:2006.1
The reactions of thiophene- and 2-thiolene-1,1-dioxides bearing electron-withdrawing groups (EWGs) with C-, O-, and S-nucleophiles lead to regio- and stereo-selective formation of Michael adducts in high yields.