Regio‐ and Stereoselective Chan‐Lam‐Evans Enol Esterification of Carboxylic Acids with Alkenylboroxines
作者:Luuk Steemers、Linda Wijsman、Jan H. van Maarseveen
DOI:10.1002/adsc.201800914
日期:2018.11.5
Efficient and scalable Cu(II)‐mediated enol esterification methodology of carboxylicacids from alkenyl boroxines and boronic acids is presented. The reaction shows a wide scope in aliphatic and aromatic carboxylicacids in combination with several alkenyl boroxines. In the case of 2‐substituted alkenyl boroxines the double bond configuration was fully retained in the enol ester product. Also N‐hydroxyimides
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.
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:US09192927B2
公开(公告)日:2015-11-24
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)(PtBu3)]2. The method is based on a comproportionation reaction in which a Pd(ll) compound (═PdBr2) is reacted with a Pd(0) compound (═Pd(PtBu3)2) in organic solvents to yield the [Pd(μ-Br)(PtBu3)]2 compound having the Pd atoms in the formal oxidation state +1. Unreacted PdBr2 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 R1—C(O)—O—CH(R2)—C(R3)═CH2 employing the compound Pdμ-Br)(PtBu3)]2 as a catalyst is disclosed.
Synthesis of Enol Esters from Copper(I) Carboxylates Generated from Copper(I) Trifluoromethanesulfonate Benzene Complex
作者:Scott R. Lefler、Seth D. Rose
DOI:10.1080/00397919908086020
日期:1999.11
Abstract A rapid method for the preparation of copper(I) carboxylates by use of copper(I) trifluoromethanesulfonatebenzenecomplex followed by their conversion to enol esters under mild conditions is presented.
Dual Transition Metal Electrocatalysis: Direct Decarboxylative Alkenylation of Aliphatic Carboxylic Acids
作者:Jiaqing Lu、Yan Yao、Liubo Li、Niankai Fu
DOI:10.1021/jacs.3c08839
日期:2023.12.13
the reaction. This new alkenylation protocol has been successfully demonstrated in direct modification of naturally occurring complex acids and is amenable to the enantioselective decarboxylative alkenylation of arylacetic acid. Mechanistic studies, including a series of controlled experiments and cyclic voltammetry data, allow us to probe the key intermediates and the pathway of the reaction.