Abstractmagnified imageThe chiral center at the α‐position of amides is installed in excellent enantioselectivity via the iridium‐catalyzed asymmetric hydrogenation of α,β‐unsaturated amides under mild conditions. Even aliphatic amides are suitable substrates. The presence of a hydrogen atom on the nitrogen of the amide is important for the enantioselectivity of the reaction.
Rational Optimization of Supramolecular Catalysts for the Rhodium-Catalyzed Asymmetric Hydrogenation Reaction
作者:Julien Daubignard、Remko J. Detz、Anne C. H. Jans、Bas de Bruin、Joost N. H. Reek
DOI:10.1002/anie.201707670
日期:2017.10.9
Rational design of catalysts for asymmetric transformations is a longstanding challenge in the field of catalysis. In the current contribution we report a catalyst in which a hydrogen bond between the substrate and the catalyst plays a crucial role in determining the selectivity and the rate of the catalytichydrogenation reaction, as is evident from a combination of experiments and DFT calculations
BiCl<sub>3</sub>-catalysed nucleophilic substitution of Baylis–Hillman adducts with alcohols
作者:Jian Li、Xiaotao Liu、Peichao Zhao、Xueshun Jia
DOI:10.3184/030823408x304014
日期:2008.3
An efficient nucleophilic substitution of Baylis–Hillman adducts with alcohols catalysed by 10 mol% BiCl3, affords functionalised ethers. Water was the only side product.
silica chloride, an eco-friendly heterogeneous catalyst, silica chloride–arenes, and silica chloride–saturated and unsaturatedalcohols as reagent systems are reported. These reactions furnished highly functionalized isomerized Baylis–Hillman derivatives in good yield. The efficiency and necessity of silica chloridecatalyst was compared with thionyl chloride. A plausible mechanism of the reaction is proposed
2-(Methoxymethyl)--3-aryl-2-propenoic Acids and 2-(Bromomethyl)-3-aryl-2-propenoic Acids from Aromatic Aldehydes
作者:Engelbert Ciganek
DOI:10.1021/jo00119a047
日期:1995.7
FeCl<sub>3</sub>‐Catalyzed Nucleophilic Substitution of Baylis–Hillman Adducts with Alcohols
作者:Xueshun Jia、Peichao Zhao、Xiaotao Liu、Jian Li
DOI:10.1080/00397910801929622
日期:2008.4.1
FeCl3-catalyzed nucleophilic substitution reaction of Baylis-Hillman adducts with alcohols is described. The present protocol allows for the efficient syntheses of many kinds of functional ethers. This conversion is also a green route because water is the only side product.