Synthesis of 1,4-dienes by Pd(II)-catalyzed haloallylation of alkynes with allylic alcohols in ionic liquids
摘要:
A Pd-catalyzed haloallylation of alkynes with ally] alcohols in ionic liquids has been reported. Both chloroallylation and bromoallylation can be easily carried out with high selectivity. A variety of 1,4-dienes were formed in moderate to excellent yields. The reaction system of the Pd catalyst as well as the ionic liquid can be recycled for several times. And the ionic liquid acts as not only a solvent in the reaction, but also provides the excess halide ions to control Z/E selectivity and acts as a ligand inhibit the beta-hydride elimination. (C) 2014 Published by Elsevier Ltd.
Three in one: A highly efficient and mild PdII‐catalyzed carboesterification of alkenes with carboxylic alkyne derivatives proceeds through a domino‐type alkyne–alkene coupling/CO‐bond formation (see scheme). The stereoselectivity is controlled by the choice of substrates and temperature. The reaction provides a convenient method for the construction of naturally occurring biologically active compounds
A Pd-catalyzed haloallylation of alkynes with ally] alcohols in ionic liquids has been reported. Both chloroallylation and bromoallylation can be easily carried out with high selectivity. A variety of 1,4-dienes were formed in moderate to excellent yields. The reaction system of the Pd catalyst as well as the ionic liquid can be recycled for several times. And the ionic liquid acts as not only a solvent in the reaction, but also provides the excess halide ions to control Z/E selectivity and acts as a ligand inhibit the beta-hydride elimination. (C) 2014 Published by Elsevier Ltd.