Vinyl t-butyl sulfoxides as Trifluoroacetoxy Sulfenylating Agents towards olefins
摘要:
Acceptor substituted vinylic t-butyl sulfoxides behave in acidic medium as formal vinylthiyl cations. These electrophilic species add to olefins, hexyne and allene to form beta-trifluoroacetoxy-sulfenylation products 9.
Application of a New Chiral Phosphepine to the Catalytic Asymmetric Synthesis of Highly Functionalized Cyclopentenes That Bear an Array of Heteroatom-Substituted Quaternary Stereocenters
作者:Yuji Fujiwara、Gregory C. Fu
DOI:10.1021/ja2049012
日期:2011.8.10
the design and synthesis of a new chiral phosphepine, the first catalytic asymmetric method for the [3 + 2] cycloaddition of allenes with olefins has been developed that generates cyclopentenes that bear nitrogen-, phosphorus-, oxygen-, and sulfur-substituted quaternary stereocenters. A wide array of racemic γ-substitutedallenes can be employed in this stereoconvergent process, which occurs with good
Captodative substituent effects — Part XXXI olefins with captodative substitution in [2+2] cycloadditions
作者:Ch. De Cock、S. Piettre、F. Lahousse、Z. Janousek、R. Merényi、H.G. Viehe
DOI:10.1016/s0040-4020(01)97193-5
日期:1985.1
Olefins with captodative substitution are excellent partners in [2+2] cycloadditions leading to cyclobutane derivatives. The reaction rates increase with the radical stabilising power of the substituents. Thio- and selenoalkyl(aryl) substituted gemdifluoroolefins allow the synthesis of new cyclobutane derivatives.
Dienophilie des olefines captodatives - VI1 syntheses et cycloadditions de diels-alder des α-alkylthio-acrylates d'alkyle avec le cyclopentadine : influence des facteurs steriquis sur la reactivite et sur la stereoselectivite
作者:Jean-Luc Boucher、Lucien Stella
DOI:10.1016/s0040-4020(01)85989-5
日期:1988.1
The Diels-Alder reactions of cyclopentadiene with a series of four α-alkylthio-alkyl acrylates were investigated. Although slightly slower than the reactions of unsubstituted alkyl acrylates, the spontaneous cycloadditions of these captodative olefins occur at room temperature affording adducts in excellent yield. The steric effect of the ester function is found to be more important in determining