Lipase-catalyzed Knoevenagel condensation between α,β-unsaturated aldehydes and active methylene compounds
作者:Zhi Wang、Chun-Yu Wang、Hao-Ran Wang、Hong Zhang、Ya-Lun Su、Teng-Fei Ji、Lei Wang
DOI:10.1016/j.cclet.2014.03.036
日期:2014.5
A simple and efficient Knoevenagel condensation between α,β-unsaturatedaldehydes and active methylene compounds is reported. Notably, this condensation can be catalyzed by PPL (lipase from porcine pancreas) with satisfied yields (49%–92%). Moreover, PPL induces moderate Z/E selectivity in the Knoevenagel condensation.
Natural <font>α</font>-Amino Acid L-Lysine–Catalyzed Knoevenagel Condensations of <font>α</font>,<font>β</font>-Unsaturated Aldehydes and 1,3-Dicarbonyl Compounds
作者:Yan-Hong He、Ying Hu、Zhi Guan
DOI:10.1080/00397911.2010.490626
日期:2011.5.3
Abstract Knoevenagel condensations of α,β-unsaturated aldehydes and 1,3-dicarbonylcompounds were catalyzed by primary natural amino acid L-lysine. The reactions were carried out at room temperature in dimethylsulfoxide. It provides a facile entry to a wide variety of α,β,γ,δ-unsaturated dicarbonyl compounds. Supplemental materials are available for this article. Go to the publisher's online edition
Biocatalytic Knoevenagel reaction using alkaline protease from<i>Bacillus licheniformis</i>
作者:Bang-Hua Xie、Zhi Guan、Yan-Hong He
DOI:10.3109/10242422.2012.662961
日期:2012.3
condensations of aromatic, hetero-aromatic and α;β-unsaturated aldehydes with less reactive acetylacetone or ethyl acetoacetate. The reactions were performed in organic solvent in the presence of water. The functionalized trisubstituted alkenes and α,β,γ,δ-unsaturated carbonylcompounds could be obtained in moderate to good yields with E/Z selectivities up to >99:1. This biocatalytic reaction provided an alternative
Enzyme catalytic promiscuity: The papain-catalyzed Knoevenagel reaction
作者:Wen Hu、Zhi Guan、Xiang Deng、Yan-Hong He
DOI:10.1016/j.biochi.2011.09.018
日期:2012.3
Knoevenagel reactions in DMSO/water. A wide range of aromatic, hetero-aromatic and α,β-unsaturated aldehydes could react with less active methylene compounds acetylacetone and ethyl acetoacetate. The products were obtained in moderate to excellent yields with Z/E selectivities of up to 100:0. This case of biocatalytic promiscuity not only widens the application of papain to new chemical transformations