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
Ethyl bromodifluoroacetate reacted with alkenyl or aryl iodides in the presence of copper powder in dimethyl sulfoxide (DMSO) to give the corresponding alkynyl- or aryldiffuoroacetates in moderated to good yields.
Asymmetric synthesis of optically pure α-methyl-β,γ-unsaturated ketones via triethylaluminum-mediated stereospecific pinacol rearrangement of alkenyl groups
Optically pure α-methyl-β,γ-unsaturated ketones are synthesized by the Et3Al-mediated pinacol-type rearrangement where alkenyl groupsmigrate stereospecifically with complete retention of the olefin-geometry.