Asymmetric Aldol Reaction Catalyzed by the Anion of an Ionic Liquid
作者:Vincent Gauchot、Andreea R. Schmitzer
DOI:10.1021/jo300737u
日期:2012.6.1
its applications as a catalyst for the asymmetric aldolreaction. By performing the aldolreaction in [Bmim]NTf2 as a solvent, we report excellent isolated yields of the aldol product (up to 99%), as well as modest to excellent selectivities (dr superior to 99:1. ee up to 89%). Mechanistic insights and the origins of the selectivity of the aldolreaction are discussed on the basis of the results obtained
Surface-mediated solid phase reaction. Aldol reaction of silyl enol ethers with aldehydes on a solid surface of neutral alumina: selectivity for anti aldols
作者:Brindaban C. Ranu、Rupak Chakraborty
DOI:10.1016/s0040-4020(01)82382-6
日期:1993.6
The aldolreaction of trimethyl silylenolethers with aldehydes on the solid surface of neutral alumina under sonication without any solvent is found to proceed providing cross aldol products with anti selectivity.
Direct asymmetric aldol reactions between aldehydes and ketones catalyzed by l-tryptophan in the presence of water
作者:Zhaoqin Jiang、Hui Yang、Xiao Han、Jie Luo、Ming Wah Wong、Yixin Lu
DOI:10.1039/b921460g
日期:——
Primary amino acids and their derivatives were investigated as catalysts for the direct asymmetric aldol reactionsbetween ketones and aldehydes in the presence of water, and L-tryptophan was shown to be the best catalyst. Solvent effects, substrate scope and the influence of water on the reactions were investigated. Quantum chemical calculations were performed to understand the origin of the observed
Highly enantioselective aldol reactions catalyzed by reusable upper rim-functionalized calix[4]arene-based l -proline organocatalyst in aqueous conditions
作者:Zheng-Yi Li、Yuan Chen、Chong-Qian Zheng、Yue Yin、Liang Wang、Xiao-Qiang Sun
DOI:10.1016/j.tet.2016.11.052
日期:2017.1
l-Proline derivatives have been synthesized and employed for the enantioselective aldol reactions between cyclic ketones and aromatic aldehydes in the presence of water. Good to excellent yields (up to 96%), enantioselectivities (up to 99% ee), as well as diastereoselectivities (up to 99:1 dr) were obtained under the optimal reaction conditions. Detailed experiments clearly showed that the hydrophobic
Simple and Facile l-Prolinamides Derived from Achiral Cycloalkylamines as Organocatalysts for the Highly Efficient Large-Scale Asymmetric Direct Aldol Reactions
simple catalyst can be efficiently used in large-scale reactions with the enantioselectivity being maintained at the same level, which offers great possibility for applications in industry.Graphical AbstractAll of the catalysts 1a–e synthesized fromachiral cycloalkylamines in a facile manner and their catalytic properties were studied in depth for the first time. All of the catalysts 1a–e exhibited great