Regioselective Formation of Enol Esters from the Ruthenium-Catalyzed Markovnikov Addition of Carboxylic Acids to Alkynes
作者:Janine Jeschke、Christian Gäbler、Heinrich Lang
DOI:10.1021/acs.joc.5b02293
日期:2016.1.15
selectivities with up to 99% of the Markovnikov product were achieved. The electronic influence of the substrates on the reaction rate was quantified by Hammett plots. By the use of electron-rich alkynes or highly acidic carboxylic acids, the reaction rate could be increased. Hence, the addition of highly acidic pentafluorobenzoic acid to electron-rich 4-methoxyphenylacetylene can even be carried out
Ruthenium(IV)-Catalyzed Markovnikov Addition of Carboxylic Acids to Terminal Alkynes in Aqueous Medium
作者:Victorio Cadierno、Javier Francos、José Gimeno
DOI:10.1021/om1010325
日期:2011.2.28
promote the selective Markovnikov addition of both aromatic and aliphatic carboxylic acids to a large variety of terminal alkynes, enynes, and diynes as well as propargylicalcohols. In this way, a wide number of enol esters and β-oxoesters could be synthesized in moderate to good yields under mild conditions (60 °C) in an aqueous medium.
The regioselective preparation of 1,3-diketones within a micro reactor
作者:Charlotte Wiles、Paul Watts、Stephen J. Haswell、Esteban Pombo-Villar
DOI:10.1039/b201220k
日期:2002.5.9
We demonstrate a simple method for the regioselective preparation of 1,3-diketones within a micro reactor from silyl enol ethers where the products are free from both competing O-acylation and diacylation products.
Acylation of active methylene compounds via palladium complex-catalyzed carbonylative cross-coupling of organic halides
作者:Toshi-aki Kobayashi、Masato Tanaka
DOI:10.1016/s0040-4039(00)85054-6
日期:1986.1
New procedures for acylation of activemethylenecompounds via palladium complex-catalyzed carbonylation of organic halides are disclosed.
公开了通过钯配合物催化的有机卤化物的羰基化作用,将活性亚甲基化合物酰化的新方法。
Enol Ester Synthesis via Cobalt-Catalyzed Regio- and Stereoselective Addition of Carboxylic Acids to Alkynes
作者:Jia-Feng Chen、Changkun Li
DOI:10.1021/acs.orglett.8b02824
日期:2018.11.2
A cobalt-catalyzed highly regio- and stereoselective hydro-oxycarbonylation of alkynes is reported. Both terminal and internal alkynes can react with carboxylic acids to afford enol esters in high yields. The catalyst generated from Co(BF4)2, tridentate phosphine ligand L5, and zinc in situ exhibits much higher reactivity than the corresponding cobalt/diphosphine complex.