Synthesis of Functionalized α,α-Disubstituted β-Alkynyl Esters from Allenoates through an Alkynylenolate Intermediate
作者:Weibo Wang、Bo Xu、Gerald B. Hammond
DOI:10.1021/ol801287t
日期:2008.9.1
Highly substituted alpha,alpha-disubstituted beta-alkynyl esters are readily prepared from allenyl esters and either alkyl halide, acid chloride, or alkyl chloroformate, mediated by an amide base. This highly efficient and mild process tolerates various functional groups and provides alpha,alpha-disubstituted beta-alkynyl esters in good to excellent yields. This method is especially suitable for the
Palladium-Catalyzed Alkylation of Vinyl Oxiranes with Substituted Allenes. Direct Access to Bifunctionalized Allylic Alcohols
作者:Perli Nanayakkara、Howard Alper
DOI:10.1021/jo040139i
日期:2004.7.1
The first palladium-catalyzed alkylation of vinyl oxiranes with substituted allenes to form functionalized allylicalcohols is described. The reaction of activated allenes 5 with vinyl oxiranes 1 in the presence of catalytic amounts of Pd(PPh3)4 (10 mol %) and 1,3-bis(diphenylphosphino)propane (dppp) (20 mol %) in THF at 60 °C gave the corresponding allylicalcohols 6 in good to excellent yields. The