Polymer-Supported Lewis Bases for the Baylis–Hillman Reaction
作者:Jin-Wen Huang、Min Shi
DOI:10.1002/adsc.200303072
日期:2003.8
of polymer-supported Lewisbases such as PEG4600-(PPh2)2 and poly(DMAP) in the Baylis–Hillman reactions of N-tosylimines (ArCHNTs) 1 or the corresponding arenecarbaldehydes with α,β-unsaturated ketones has been investigated. The corresponding Baylis–Hillman adducts are obtained in good yields. The polymer-supported Lewisbases can be easily recovered by filtration and the Lewis base PEG4600-(PPh2)2
Studying the Morita-Baylis-Hillman Reaction in Continuous Flow Using Packed Bed Reactors
作者:Rasmus A. T. Verdier、Jesper H. Mikkelsen、Anders T. Lindhardt
DOI:10.1021/acs.oprd.8b00298
日期:2018.11.16
Conditions for the Morita-Baylis-Hillmanreaction were developed under continuous flow using a packed bed reactor carrying 4-(dimethylamino)pyridine immobilized on silica. High reaction rates were obtained, as the packed bed reactor mimics super-stoichiometric catalyst loadings for the passing reaction mixture. Catalyst deactivation was circumvented by avoiding acrylate esters as the reaction partners. The
Proline-Mediated Baylis–Hillman Reaction of Methyl Vinyl Ketone without a Co-catalyst under Solvent-Free Conditions
作者:Srinivasan Easwar、Heena Inani、Ajit Jha
DOI:10.1055/s-0036-1588320
日期:——
A proline-mediated Baylis–Hillmanreaction of methyl vinyl ketone with aromatic aldehydes has been carried out without using any co-catalyst, under solvent-free conditions. The reaction works efficiently at 60 °C in the presence of a small amount of water to afford the Baylis–Hillman adducts in reasonable to very good yields over 8–48 h. The absence of a co-catalyst suggests that proline plays a role
脯氨酸介导的甲基乙烯基酮与芳香醛的 Baylis-Hillman 反应已在无溶剂条件下进行,无需使用任何助催化剂。该反应在 60 °C 下在少量水存在下有效进行,以在 8-48 小时内以合理到非常好的产率提供 Baylis-Hillman 加合物。没有助催化剂表明脯氨酸除了参与亚胺离子形成和共轭加成外,还在反应机制的质子转移步骤中发挥作用。原则上,这意味着脯氨酸在反应中充当三功能催化剂,而对这方面更深入了解的机理研究应该会在未来提供进一步的见解。
The Enantioselective Chalcogeno-Baylis-Hillman Reaction Using a Chiral Hydroxy Chalcogenide-TiCl<sub>4</sub>Complex
The enantioselective chalcogeno-Baylis-Hillman reaction was investigated by the use of chiral hydroxy chalcogenides in the presence of TiCl4 under atmospheric pressure. The best result was obtained with 10-methylthioisobornenol as a chiral hydroxy chalcogenide.
<i>N</i>-Alkylimidazole
as Amphiphilic Organocatalyst: ‘Catalytic’ Morita-Baylis-Hillman
Reaction on Water without Organic Solvent
作者:Seijiro Matsubara、Keisuke Asano
DOI:10.1055/s-0028-1087484
日期:——
In the presence of water, a Morita-Baylis-Hillman reaction between methyl vinyl ketone and various aldehydes was performed with a catalytic amount of an imidazole carrying a hydrophobic group.