The Wittig reaction of perfluoro acid derivatives: access to fluorinated enol ethers, enamines, and ketones
作者:Jean Pierre Begue、Daniele Bonnet-Delpon、Dany Mesureur、Gerard Nee、Sheng Wen Wu
DOI:10.1021/jo00040a017
日期:1992.7
The preparation of novel perfluoroalkyl-substituted compounds in good yields is described. This preparation involves the Wittig reaction of a phosphonium ylide with perfluoroalkyl acid derivatives. The influence of the structure of the starting alkylidenetriphenylphosphoranes, the perfluoroalkyl reagents, and the reaction conditions has been investigated. Trifluoroacetamides lead to a Z/E mixture of enamines 3. Perfluoroalkyl esters (Rf = CF3, C2F5, C3F7, C7F15, CF2Cl) lead to only the (Z)-enol ethers 8-12 when reactions are performed with NaNH2 as a base and to 1-perfluoroalkyl ketones 13-17 when reactions are performed with BuLi.
Electrochemical Dimerization of Phenylpropenoids and the Surprising Antioxidant Activity of the Resultant Quinone Methide Dimers
作者:Kevin J. Romero、Matthew S. Galliher、Mark A. R. Raycroft、Jean‐Philippe R. Chauvin、Irene Bosque、Derek A. Pratt、Corey R. J. Stephenson
DOI:10.1002/anie.201810870
日期:2018.12.21
functional group tolerance, resulting in a unified approach for the synthesis of a range of natural products and related analogues with excellent regiocontrol. The operational simplicity of the method allows for greater efficiency in the synthesis of complex natural products. Interestingly, the quinonemethide dimer intermediates are potent radical-trapping antioxidants; more so than the phenols from