A convenient synthesis of 1,5-diarylpyrazoles from Baylis-Hillman adducts using HY-zeolite
摘要:
A facile and convenient protocol was developed for the synthesis of 1,5-diarylpyrazoles using Baylis-Hillman adducts in the presence of HY-zeolite as an efficient recyclable heterogeneous catalyst in reasonable reaction times (1.5-2.5 h) and high yields (78-90%). (C) 2009 Manouchehr Mamaghani. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
1-脯氨酸已经在刚性线性配体H 4 L中共价连接,所述刚性线性配体H 4 L在每个末端具有间苯二甲酸酯部分以形成手性配体H 4 LPRO。该连接体已用于构建多孔MOF L Cu PRO。自由升在咪唑存在作为助催化剂功能的框架的空腔-脯氨酸部分协同催化α,β不饱和羰基化合物和芳族醛类之间的的Baylis-Hillman反应。氮吸附等温线证明了骨架的高孔隙率。
Bifunctional Polymeric Organocatalysts and Their Application in the Cooperative Catalysis of Morita–Baylis–Hillman Reactions
作者:Cathy Kar-Wing Kwong、Rui Huang、Minjuan Zhang、Min Shi、Patrick H. Toy
DOI:10.1002/chem.200601197
日期:2007.3.5
these polymeric reagents contained either alkyl alcohol or phenol groups on the polymer backbone. The use of these materials as organocatalysts in a range of Morita-Baylis-Hillman reactions indicated that hydroxyl groups could participate in the reactions and accelerate product formation. In the cases examined, phenol groups were more effective than alkyl alcohol groups for catalyzing the reactions
Amino acid ionic liquids as catalysts in a solvent-free Morita–Baylis–Hillman reaction
作者:Mathias Prado Pereira、Rafaela de Souza Martins、Marcone Augusto Leal de Oliveira、Fernanda Irene Bombonato
DOI:10.1039/c8ra02409j
日期:——
reaction between methyl vinyl ketone and aromatic aldehydes differently substituted in the absence of an additional co-catalyst under organic solvent-free conditions. The AAIL derivatives from L-valine, L-leucine, and L-tyrosine catalyzed the MBH reaction only in the presence of imidazole. The MBH adducts were obtained in moderate to good yields. Although the catalytic site in the ILs was in its enantiomerically
Morita-Baylis-Hillman Reaction on Water without Organic Solvent, Assisted by a ‘Catalytic’ Amount of Amphiphilic Imidazole Derivatives
作者:Seijiro Matsubara、Keisuke Asano
DOI:10.1055/s-0029-1216944
日期:2009.10
A Morita-Baylis-Hillman (MBH) reaction using water as a solvent without any organic solvent can be performed by using an amphiphilic N-alkylimidazole. This reaction is accelerated by the addition of water and is the first example of a ‘catalytic’ MBH reaction without organic solvent in the presence of water.
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。
<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.