Tandem Reaction of Ethyl α-(Per(poly)fluoroalkyl)acetates with Allylic Alcohols: A Convenient Synthesis of Ethyl α-(2-Alkenyl)-α-(per(poly)- fluoroacyl)acetates
作者:Bing-Hao Luo、Hui-Ping Guan、Chang-Ming Hu
DOI:10.1021/jo9620369
日期:1997.6.13
Etude de la réaction des amines sur les dérivés d'acides 2-perfluoroalkylethanoïques
2H,2H-Perfluoroalkylethanoïc acids and their derivatives compounds are potentially useful intermediates. The reaction of these with primary or secondary amines gives easy access to several perfluoroalkylated products such as imines, enamines, enaminoesters and enaminoamides in good yield and high stereoselectivity.
The reaction of alcoholates with esters of perfluoroalkylethanoic acid (I) and 3-perfluoroalkyl-3-fluoro-propenoic acid (II) has been studied. Formation of ethers of the enol ester III or the acetal IV depends on the stoichiometric conditions used. The formation of the products proceeds via a Michael-type addition and elimination of fluoride ions from the enolate formed as an intermediate.