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。
Synthesis of Unsaturated Seven-Membered Ring Lactams through Palladium-Catalyzed Amination and Intramolecular Cyclocarbonylation Reactions of Amines and Baylis−Hillman Acetates
作者:Hong Cao、Tiago O. Vieira、Howard Alper
DOI:10.1021/ol102699a
日期:2011.1.7
A versatile synthesis of unsaturated seven-membered ring lactams has been developed. The sequence involves hydroamination of Baylis−Hillman acetate with amines, followed by intramolecular cyclocarbonylation reactions of the resulting allylamines. This process can tolerate a wide array of functional groups, and affords lactams in excellent yields.
1-Methylimidazole 3-N-oxide as a new promoter for the Morita–Baylis–Hillman reaction
作者:Yu-Sheng Lin、Chih-Wei Liu、Thomas Y.R. Tsai
DOI:10.1016/j.tetlet.2005.01.099
日期:2005.3
The Morita-Baylis-Hillman reaction of aldehydes with alpha,beta-unsaturated ketones can be affected by the Lewis bases. We have found that 1-methylimidazole 3-N-oxide promoted the Morita-Baylis-Hiliman reaction of various activated aldehyde compounds in non-solvent system. This is a mild reaction condition and requires no special equipment to give the Morita-BaylisHillman adducts. (C) 2005 Elsevier Ltd. All rights reserved.
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:——
Formation of Cyclohepta[<i>b</i>]indole Scaffolds via Heck Cyclization: A Strategy for Structural Analogues of Ervatamine Group of Indole Alkaloid
Ervatamine, silicine, methuenine, etc., are naturally occurring alkaloids that exhibit antimicrobial, anticancer, and anti-HIV activities. Indole fused with a seven-membered carbocyclic ring is a commonly observed structural feature among this series of bioactive compounds. This work describes a strategic approach for the synthesis of cyclohepta[b]indole structural scaffolds. The synthetic strategy consists of a solvent-free Baylis-Hillman reaction of 2-bromobenzaldehydes, followed by iodine-catalyzed C-alkylation of indole with the Baylis-Hillman adducts. Finally, intramolecular Heck coupling reaction using Pd(OAc)(2) as catalyst in the presence of benzyltrimethylammonium bromide under microwave condition produced the desired cyclohepta[b]indole derivatives.