Lewis Acid Catalyzed Conjugate Addition and the Formation of Heterocycles using Michael Acceptors under Solvent-Free Conditions
作者:Alemayehu Mekonnen、Rolf Carlson
DOI:10.1002/ejoc.200500923
日期:2006.4
Conjugate addition and conjugate-addition-initiated ringclosure (CAIRC) reactions of β-dicarbonylcompounds with Michael acceptors have been studied using several Lewis acid catalysts under solvent-free conditions. Excellent chemoselectivity was obtained when various Michael acceptors were treated with several β-dicarbonylcompounds. On the other hand, 2-bromo-2-cyclopentenone and 3-bromo-3-vinyl
Mechanochemistry and Eco-Bases for Sustainable Michael Addition Reactions
作者:Yvette Lock Toy Ki、Armelle Garcia、Franck Pelissier、Tomasz K. Olszewski、Alicja Babst-Kostecka、Yves-Marie Legrand、Claude Grison
DOI:10.3390/molecules27103306
日期:——
successfully applied with good to excellent yields to different Michael donors and acceptors. Eco-bases were recycled and reused four times with the same performances. Combining Eco-bases and mechanochemistry in Michaeladditionreactions allowed reaching a maximum degree of sustainability (efficient, rapid, low catalyst loading, solvent-free reactions with bio-sourced catalysts) and participating in the development
重新审视迈克尔加成反应,充分关注可持续性和效率,在温和条件下使用机械化学。首先,选择环戊烯酮衍生物的合成作为模型反应,以在使用经典但弱碱的同时找到机械化学的最佳条件。该反应高效(84-95% 产率)、快速(2-6 小时)、无溶剂,并且需要 0.1 当量的碱。为了达到更环保的条件,经典碱基随后被新的生物来源碱基(称为生态碱基)取代,这种碱基很容易从植物中制备并产生多相催化剂。采用MP-AES、XRPD、EBSD/EDS、HRTEM/EDX和离子色谱对Eco-bases的组成和结构进行了表征。有趣的是,在 K 2的存在下观察到高比例的钾Ca(CO3)2 for the most effective Eco-base. The new Eco-bases were used for the mechanical-assisted construction of functionalized alkenone
Microwave Assisted Michael Addition of Cycloalkenones and Substituted Enones on the Surface of Alumina in Dry Media
作者:Brindaban C. Ranu、Manika Saha、Sanjay Bhar
DOI:10.1080/00397919708003334
日期:1997.2
The Michael addition of ethyl acetoacetate, acetyl acetone and ethyl cyanoacetate to cycloalkenones and B-substituted enones and enal has been accomplished efficiently on the surface of alumina under microwave irradiation in dry media.
α-Amino Acid Induced Rate Acceleration in Aqueous Biphasic Lewis Acid Catalyzed Michael Addition Reactions
作者:Karolina Aplander、Rui Ding、U. Marcus Lindström、Johan Wennerberg、Sara Schultz