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.
The first Pd-catalyzed Mizoroki-Heck-type reaction of [Ph2SRfn][OTf] with alkenes is described. The reaction of [Ph2SRfn][OTf] (Rfn = CF3, CH2CF3) with alkenes in the presence of 10 mol% Pd[P(t-Bu)3]2 and TsOH...
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
Pd-catalysed direct dehydrogenative carboxylation of alkenes: facile synthesis of vinyl esters
作者:Dan Yang、Shixuan Ding、Jianhui Huang、Kang Zhao
DOI:10.1039/c2cc37779a
日期:——
A novel Pd-catalysed oxidative coupling reaction methodology using readily available carboxylic acids and alkenes for the preparation of vinyl esters has been developed. A broad range of vinyl esters were successfully synthesised. The reactions have demonstrated good efficiency as well as excellent chemo- and regio-selectivity.
Octahedral Ru
<sup>II</sup>
Complexes with [PNO] Hydrazonic Ligands: Synthesis, Structure, Reactivity and Catalytic Activity in the Addition of Benzoic Acid to Alkynes
The complexes trans-[Ru(κ3-(H)PNO)(PPh3)Cl2] reacted with dmso to give the bis-chelate complex [Ru(κ3-PNO)2], [Ru(dmso)4]Cl2, OPPh3, HCl and Me2S, through an oxygen-transfer reaction from dmso to PPh3. A catalytic version of this reaction was also developed. The complexes obtained from [Ru(PPh3)3Cl2] were tested as homogeneous pre-catalysts for the coupling between benzoic acid and terminal alkynes