Copper-Catalyzed Nondecarboxylative Cross Coupling of Alkenyltrifluoroborate Salts with Carboxylic Acids or Carboxylates: Synthesis of Enol Esters
作者:Fang Huang、Tan D. Quach、Robert A. Batey
DOI:10.1021/ol4013712
日期:2013.6.21
A mild copper-catalyzed Chan–Lam–Evans type cross-coupling reaction for the regioselective and stereospecific preparation of (E)- or (Z)-enol esters is described. The method couples carboxylate salts or carboxylic acids with potassiumalkenyltrifluoroboratesalts in the presence of catalytic CuBr and DMAP with 4 Å molecular sieves under O2 at 60 °C. Overall, this method demonstrates carboxylic acids
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
[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。
Regiocontrolled Ru-catalyzed addition of carboxylic acids to alkynes: practical protocols for the synthesis of vinyl estersWe thank Prof. Dr. M. T. Reetz for generous support and constant encouragement, and gratefully acknowledge the DFG, the FCI, and the BMBF for financial support.
作者:Lukas J. Goossen、Jens Paetzold、Debasis Koley
DOI:10.1039/b211277a
日期:2003.3.6
The catalytic activity of commercially available, air and water stable ruthenium complexes in the addition of carboxylic acids to terminal alkynes was found to be drastically enhanced by the addition of small quantities of base. Moreover, the regioselectivity of the reaction can be controlled by the choice of the base so that both the Markovnikov (Na2CO3) and the anti-Markovnikov products (DMAP) are now easily accessible in excellent selectivities.
Pyrex-filtered photoirradiation with a high-pressure Hg lamp was performed for a thermally inert hydridocobalt(I) CoH[PPh(OEt)2]4 in the presence of some allylic compounds. Allyl benzoate and allyl phenyl ether showed the cleavage of allylic-O bonds to give propene in a stoichiometric quantity to the complex charged. Photoassisted catalytic double-bond migration occurred for N-allylacetamide, N,N-diethylallylamine