The palladium-catalyzedregioselective alkoxycarbonylation of allenes with aliphatic alcohols allows to produce synthetically useful α,β- and β,γ-unsaturated esters in good yields. Efficient selectivity control is achieved in the presence of appropriate ligands. Using Xantphos as the ligand, β,γ-unsaturated esters are produced selectively in good yields. In contrast, the corresponding α,β-unsaturated
Chemoselectivity in the conjugate addition of allylsilane to Michael acceptors
作者:George Majetich、Ada M. Casares、D. Chapman、M. Behnke
DOI:10.1016/s0040-4039(00)81803-1
日期:1983.1
The allylic carbanion species generated by treatment of allylsilane with fluoride ion undergoes highly chemoselective conjugateaddition to a series of Michaelacceptors for which alternative known allylation procedures proved less general.