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.
First Evidence of Proline Acting as a Bifunctional Catalyst in the Baylis–Hillman Reaction Between Alkyl Vinyl Ketones and Aryl Aldehydes
作者:Michelangelo Gruttadauria、Francesco Giacalone、Paolo Lo Meo、Adriana Mossuto Marculescu、Serena Riela、Renato Noto
DOI:10.1002/ejoc.200701112
日期:2008.3
Proline in the presence of sodium hydrogen carbonate has been found to be an effective catalyst for the Baylis–Hillman reaction between methyl or ethylvinyl ketone and aryl aldehydes. Screening of several amine catalysts showed that an ionizable carboxylic function directly linked to the secondary amine catalyst plays an important role in the synthesis of the desired product in good yield. The data
Baylis–Hillman reaction between an aldehyde and an activated alkene, such as alkyl vinyl ketones, acrylates, acrylonitrile, and vinylsulfones, giving the β-hydroxy-α-methylene carbonyl compounds, is a versatile and atom-economical carbon–carbon bond-forming reaction. This reaction usually is catalyzed by strong Lewis bases such as tertiaryamines and suffers from slow reaction rate. In this paper the
Patil, Nitin R.; Kshirsagar, Siddheshwar W.; Samant, Shriniwas D., Journal of the Indian Chemical Society, 2013, vol. 90, # 10, p. 1703 - 1712
作者:Patil, Nitin R.、Kshirsagar, Siddheshwar W.、Samant, Shriniwas D.
DOI:——
日期:——
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。
A convenient synthesis of 1,5-diarylpyrazoles from Baylis-Hillman adducts using HY-zeolite
作者:Mohammad Nikpassand、Manouchehr Mamaghani、Mohammad Ali Zanjanchi、Nosrat Olah Mahmoodi、Massomeh Mirzaeinejad
DOI:10.1016/j.cclet.2009.07.020
日期:2010.1
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.