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
Bimetallic Oriented (<ovl>Au</ovl>
/<ovl>Cu<sub>2</sub>
</ovl>
O) vs. Monometallic 1.1.1 <ovl>Au</ovl>
(0) or 2.0.0 <ovl>Cu<sub>2</sub>
</ovl>
O Graphene-Supported Nanoplatelets as Very Efficient Catalysts for Michael and Henry Additions
作者:Andrada Simion、Natalia Candu、Simona M. Coman、Ana Primo、Ivan Esteve-Adell、Véronique Michelet、Vasile I. Parvulescu、Hermenegildo Garcia
DOI:10.1002/ejoc.201801443
日期:2018.12.2
Michael and Henryaddition reactions have been investigated using mono (Au/fl‐G and Cu2O/fl‐G) and bimetallicnanoplatelets (Au/Cu2O/fl‐G) grafted onto few‐layers graphene films as heterogeneous catalysts. These reactions occurred in the absence of any extrinsic base with TONs at least four orders of magnitude higher.
已经使用接枝到几层石墨烯薄膜上的单相(Au / fl -G和 Cu 2 O / fl -G)和双金属纳米片(Au / Cu 2 O / fl -G)研究了迈克尔和亨利的加成反应作为非均相催化剂。这些反应是在不存在任何外部碱(TONs至少高四个数量级)的情况下发生的。
Organocatalytic Asymmetric Tandem Michael−Henry Reactions: A Highly Stereoselective Synthesis of Multifunctionalized Cyclohexanes with Two Quaternary Stereocenters
作者:Bin Tan、Pei Juan Chua、Yongxin Li、Guofu Zhong
DOI:10.1021/ol8007183
日期:2008.6.1
A novel organocatalyticasymmetric tandem Michael-Henry reaction catalyzed by 9-amino-9-deoxyepiquinine (VI) has been developed. The reaction was efficiently catalyzed by catalyst VI to give highly functionalized cyclohexanes with four stereogeniccarbons including two quaternary stereocenters in excellent enantioselectivities (97 to >99% ee) and high diastereoselectivities (93:7-99:1 dr). Thus, the