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
Total syntheses of gerberinol I and the pterophyllins 2 and 4 using the Casnati–Skattebøl reaction under different conditions
作者:Jorgelina L. Pergomet、Andrea B. J. Bracca、Teodoro S. Kaufman
DOI:10.1039/c7ob01471f
日期:——
The concise and efficient total syntheses of the naturally-occurring coumarin derivatives gerberinol I, and the pterophyllins 2 and 4, from 5-methyl-4-hydroxycoumarin as a common precursor employing different Casnati-Skattebøl reaction conditions, are reported. The synthesis of the key intermediate coumarin was achieved by the organocatalytic condensation of acetylacetone and crotonaldehyde followed