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
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
There are disclosed compounds of formula (I) that modulate the activity of inhibitors of apoptosis (lAPs), pharmaceutical compositions containing said compounds and methods of treating proliferative disorders and disorders of dysregulated apoptosis, such as cancer, utilizing said compounds.
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.