We have reported that the reaction of ethyl bromodifluoroacetate (1) with alkenyl iodides in the presence of copper powder gives ethyl alkenyldifluoroacetates. As an extension of this reaction, reaction of 1 with Michael acceptors in the presence of copper powder was examined and found to give 1,4-addition products selectively, unless the acceptor has a group stabilizing a radical intermediate, such
Treatment of α,β-unsaturatedketones and fluoroalkyl halides with Et2Zn in the presence of RhCl(PPh3)3 gave novel reductive fluoroalkylation products at the α-position of α,β-unsaturatedketones in moderate to good yields. The rhodium hydride complex derived from Et2Zn and Rh catalyst seems to have played an important role in this reaction.
Reactions of ethyl bromodifluoroacetate in the presence of copper powder
作者:K. Sato、M. Omote、A. Ando、I. Kumadaki
DOI:10.1016/j.jfluchem.2003.11.023
日期:2004.4
We have examined the reaction of ethyl bromodifluoroacetate (1) in the presence of copper powder as a procedure for the synthesis of compounds containing a CF2 group. The complex formed in the above reaction reacted with vinyl or aryl iodides to give cross-coupling products, with Michael acceptors to give 1,4-addition products and with olefins to give radical addition products. The cross-coupling reaction