[Pd(μ-Br)(P<sup><i>t</i></sup>Bu<sub>3</sub>)]<sub>2</sub> as a Highly Active Isomerization Catalyst: Synthesis of Enol Esters from Allylic Esters
作者:Patrizia Mamone、Matthias F. Grünberg、Andreas Fromm、Bilal A. Khan、Lukas J. Gooßen
DOI:10.1021/ol301563g
日期:2012.7.20
to be highly active for catalyzing double-bond migration in various substrates such as unsaturated ethers, alcohols, amides, and arenes, under mild conditions. It efficiently mediates the conversion of allylic esters into enolesters, rather than inserting into the allylic C–O bond. The broad applicability of this reaction was demonstrated with the synthesis of 22 functionalized enolesters.
发现二聚体Pd(I)络合物[Pd(μ-Br)(P t Bu 3)] 2具有高活性,可催化不饱和醚,醇,酰胺和芳烃等各种底物中的双键迁移,在温和的条件下。它有效地调节了烯丙基酯到烯醇酯的转化,而不是插入烯丙基C–O键。通过合成22种官能化的烯醇酯证明了该反应的广泛适用性。
Method for the Preparation of Palladium(I) Tri-Tert-Butylphosphine Bromide Dimer and Process for its Use in Isomerization Reactions
申请人:Goossen Lukas
公开号:US20140187803A1
公开(公告)日:2014-07-03
The invention provides a new method for the preparation of the dimeric Pd(l) tri-tert.-butylphosphine bromide complex, characterized by the chemical formula [Pd(μ-Br)(P
t
Bu
3
)]
2
. The method is based on a comproportionation reaction in which a Pd(ll) compound (=PdBr
2
) is reacted with a Pd(0) compound (=Pd(P
t
Bu
3
)
2
) in organic solvents to yield the [Pd(μ-Br)(P
t
Bu
3
)]
2
compound having the Pd atoms in the formal oxidation state +1. Unreacted PdBr
2
may be reused in the process. The method is straightforward and applicable for industrial scale production and provides high product yields. Further, a new process for the isomerization of allyl ethers of the general type R
1
—C(O)—O—CH(R
2
)—C(R
3
)═CH
2
employing the compound Pdμ-Br)(P
t
Bu
3
)]
2
as a catalyst is disclosed.