61292-83-9Relevant academic research and scientific papers
Catalytic hydrogenation of α,β-unsaturated carboxylic acid derivatives using copper(i)/N-heterocyclic carbene complexes
Zimmermann, Birte M.,Kobosil, Sarah C. K.,Teichert, Johannes F.
, p. 2293 - 2296 (2019/02/27)
A simple and air-stable copper(i)/N-heterocyclic carbene complex enables the catalytic hydrogenation of enoates and enamides, hitherto unreactive substrates employing homogeneous copper catalysis and H2 as a terminal reducing agent. This atom economic transformation replaces commonly employed hydrosilanes and can also be carried out in an asymmetric fashion.
N,N-Dimethylformamide as Hydride Source in Nickel-Catalyzed Asymmetric Hydrogenation of α,β-Unsaturated Esters
Guo, Siyu,Zhou, Jianrong
supporting information, p. 5344 - 5347 (2016/11/02)
Asymmetric transfer hydrogenation of α,β-unsaturated esters is realized by using a nickel/bisphosphine catalyst and N,N-dimethylformamide (DMF) as the hydride source.
Efficient one-pot synthesis of dihydroquinolinones in water at room temperature
Linsenmeier, Anna M.,Braje, Wilfried M.
, p. 6913 - 6919 (2015/08/24)
A mild and robust one-pot protocol for the Rh-catalyzed 1,4-addition of 2-aminoboronic acid to α,β-unsaturated esters for the efficient synthesis of dihydroquinolinones has been developed. Furthermore the addition of a variety of substituted boronic acids to diverse α,β-unsaturated esters has been investigated. The reactions proceed in water containing catalytic amounts of the commercially available designer surfactant TPGS-750-M (via the formation of nanomicelles). This mild and easy to perform process proceeds at room temperature and tolerates a wide range of functionalities.
Nickel-catalyzed asymmetric transfer hydrogenation of conjugated olefins
Guo, Siyu,Yang, Peng,Zhou, Jianrong
supporting information, p. 12115 - 12117 (2015/07/28)
Asymmetric transfer hydrogenation of electron-deficient olefins is realized with nickel catalysts supported by strongly σ-donating bisphosphines. Deuterium labeling experiments point to a reaction sequence of formate decarboxylation, asymmetric hydride in
Highly enantioselective iridium-catalyzed hydrogenation of α,β-unsaturated esters
Li, Jia-Qi,Quan, Xu,Andersson, Pher G.
, p. 10609 - 10616 (2012/11/07)
α,β-Unsaturated esters have been employed as substrates in iridium-catalyzed asymmetric hydrogenation. Full conversions and good to excellent enantioselectivities (up to 99 % ee) were obtained for a broad range of substrates with both aromatic- and aliphatic substituents on the prochiral carbon. The hydrogenated products are highly useful as building blocks in the synthesis of a variety of natural products and pharmaceuticals. Asymmetric hydrogenation: A variety of α,β-unsaturated esters were hydrogenated with high enantioselectivities (see scheme). The hydrogenated products have been used in synthetic transformations as well as in formal total syntheses. Copyright
Lipase catalysed kinetic resolutions of 3-aryl alkanoic acids
Deasy, Rebecca E.,Brossat, Maude,Moody, Thomas S.,Maguire, Anita R.
, p. 47 - 61 (2011/04/18)
Hydrolase catalysed kinetic resolutions leading to a series of 3-aryl alkanoic acids (≥94% ee) are described. Hydrolysis of the ethyl esters with a series of hydrolases was undertaken to identify biocatalysts that yield the corresponding acids with excellent enantiopurity in each case. Steric and electronic effects on the efficiency and enantioselectivity of the biocatalytic transformation were also explored.
ASYMMETRIC SYNTHESIS OF UNUSUAL AMINO ACIDS: SYNTHESIS OF OPTICALLY PURE ISOMERS OF β-METHYLTYROSINE
Nicolas, Ernesto,Dharanipragada, Ramalinga,Toth, Geza,Hruby, Victor J.
, p. 6845 - 6848 (2007/10/02)
Synthesis of optically pure isomers of β-methyltyrosine has been accomplished.
REACTIONS OF ARYLAZO ARYL SULFONES WITH α,β-UNSATURATED ESTERS AND KETONES CATALYZED BY PALLADIUM(0) COMPLEX
Kamigata, Nobumasa,Satoh, Akira,Yoshida, Masato
, p. 121 - 130 (2007/10/02)
The palladium(0) catalyzed reactions of arylazo aryl sulfones (1) with α,β-unsaturated esters in benzene give aryl-substituted esters as major products and hydroarylated esters as minor products.The reactions of 1 with acyclic α,β-unsaturated ketones give considerable amounts of hydroarylated ketones and aryl-substituted ketones under similar conditions, whereas the reactions of 1 with cyclic α,β-unsaturated ketones afforded selectively hydroarylated compounds and no formation of aryl-substituted ketones was found.A plausible reaction mechanism is proposed.Key words: Arylazo aryl sulfones; palladium(0) catalyst; arylation; α,β-unsaturated carbonyl compounds; diarylpalladiumII) intermediate; catalytic cycle.
