Formation of a Quaternary Carbon Center through the Pd(0)/PhCOOH-Catalyzed Allylation of Cyclic β-Keto Esters and 1,3-Diketones with Alkynes
作者:Nitin T. Patil、Yoshinori Yamamoto
DOI:10.1021/jo0490144
日期:2004.9.1
Formation of a quaternarycarboncenter through the allylation of β-ketoesters and 1,3-diketones with alkynes is accomplished by the use of Pd(0)/benzoic acid catalyst. Reactions of various cyclic β-ketoesters and 1,3-diketones with alkynes in the presence of Pd2dba3·CHCl3 (5 mol %), PPh3 (40 mol %), and PhCOOH (10 mol %) proceeded at 100 °C in toluene (5 M) to give the corresponding allylation products
Formation of quaternary centres via iron allyl cations. Rapid entry into spirocyclic ring systems
作者:M. Anne Charlton、James R. Green
DOI:10.1139/v97-116
日期:1997.7.1
Ester-substituted allyltetracarbonyliron cations react with cycloalkylidene-type silyl enol ethers, silyl ketene acetals, and β-keto-esters to give 1,6-dicarbonyl compounds containing a newly formed quaternary centre. Selected condensation products are converted by enolate chemistry into spirocyclic [4.4], [4.5], and [4.6] systems. Acyloin and other reductive cyclization reactions are employed to convert