Zr-Catalyzed Olefin Alkylations and Allylic Substitution Reactions with Electrophiles
作者:Judith de Armas、Stanley P. Kolis、Amir H. Hoveyda
DOI:10.1021/ja000693j
日期:2000.6.1
Disubstituted aryl olefins undergo efficient alkylations in the presence of 5 mol % Cp2ZrCl2, n-BuMgCl, and alkyl tosylates or alkyl bromides. In one class of reactions (Table 1), the resulting alkyl zirconocene (initial alkylation product) undergoes β-hydride abstraction with a hydrogen atom from within the substrate to afford allylic alkylation products (Scheme 5). In another category of reactions, where cyclic