New palladium mediated cyclopentanation of alkenes bearing a δ nucleophilic substituent
作者:Guy Fournet、Geneviève Balme、Jacques Gore
DOI:10.1016/s0040-4039(01)80325-7
日期:——
A δ-alkylpalladium intermediate generated by carbopalladation of a double bond can be intramolecularly trapped by a β-diester or a β-keto ester enolate if a cyclopentane ring is formed. Otherwise, normal β-elimination is observed.
FORNET, GUY;BALME, GENEVIEVE;GORE, JACQUES, TETRAHEDRON LETT., 30,(1989) N, C. 69-70
作者:FORNET, GUY、BALME, GENEVIEVE、GORE, JACQUES
DOI:——
日期:——
Formation de cyclopentanes lors de réactions de Heck
作者:Guy Fournet、Geneviève Balme、Jacques Gore
DOI:10.1016/s0040-4020(01)90073-0
日期:1990.1
The Heck reaction of alkenes bearing in δ position an enolate of β-diester, βketo ester or β-sulfonyl ester leads to cyclopentanes issued from the intramolecular displacement of the carbone sp3-palladium bond by this enolate. This cyclisation is not observed when the enolate is in β or ε position or in the case of a δ-ethylenic amine and βelimination products are only obtained.
Palladium-mediated cyclopentanation of alkenes bearing a nucleophilic substituent. Stereochemistry and mechanism.
作者:Didier Bouyssi、Geneviève Balme、Guy Fournet、Nuno Monteiro、Jacques Gore
DOI:10.1016/s0040-4039(00)74293-6
日期:1991.3
The increased facility of the reaction 1 --> 2 simultaneously with the increased nucleophilicity of the malonate, as well as the stereospecificity observed in the case of 3, led to the conclusion that the cyclisation proceeds by a nucleophilic attack on the double bond activated by a palladium(II) species.