Lipase/Acetamide-Catalyzed Carbon-Carbon Bond Formations: A Mechanistic View
作者:Xiao-Yang Chen、Guo-Jun Chen、Jun-Liang Wang、Qi Wu、Xian-Fu Lin
DOI:10.1002/adsc.201201080
日期:2013.3.25
A lipase B from Candida antarctica (CALB)/acetamide‐catalyzed Michael addition of less‐activated ketones and aromatic nitroolefins has been developed, which is particularly interesting because neither CALB nor acetamide can independently catalyze the reaction to any appreciable extent. This co‐catalyst system was applicable to the Michael additions of cyclic and acyclic ketones to a series of aromatic
trifunctional catalyst was successfully prepared by bonding (1R,2R)-(+)-1,2-DPEN to sulfonic acidresin. The catalyst was characterized by elemental analysis, thermogravimetric (TG) analysis and infrared (IR) spectroscopy. The results indicated the coexistence of sulfonic, sulfonamido and primary amino groups on the surface of the resin. Based on the IR spectroscopy of the catalyst treated with a solution
Asymmetric Conjugate Addition of Ketones to β-Nitrostyrenes by Means of 1,2-Amino-Alcohol-Derived Prolinamides as Bifunctional Catalysts
作者:Diana Almaşi、Diego A. Alonso、Enrique Gómez-Bengoa、Yvonne Nagel、Carmen Nájera
DOI:10.1002/ejoc.200700031
日期:2007.5
This work has been supported by the Direccion General de Investigacion of the Ministerio de Educacion y Ciencia (CTQ2004-00808/BQU), by the Generalitat Valenciana (CTIOIB/2002/320, GRUPOS03/134, GRUPOS05/11 and GV05/157) and the University of Alicante.
这项工作得到了教育部长和 Ciencia 的 Direccion General de Investigacion (CTQ2004-00808/BQU)、Generalitat Valenciana (CTIOIB/2002/320、GRUPOS03/134、GRUPOS05/11 和 GV05) 和 GV05/阿利坎特大学。
Prolinamide bridged silsesquioxane as an efficient, eco-compatible and recyclable chiral organocatalyst
作者:Amàlia Monge-Marcet、Roser Pleixats、Xavier Cattoën、Michel Wong Chi Man、Diego A. Alonso、Carmen Nájera
DOI:10.1039/c1nj20516a
日期:——
from a bis-silylated prolinamide by sol–gel methodology has been successfully applied as a supported organocatalyst in asymmetric aldol and Michael reactions. Our immobilized system presents similar performances to homogeneous prolinamides and added advantages of easy recovery and good recyclability. It fits green chemistry requirements as the reactions are performed in water, at room temperature, with
Michael addition of aldehydes and ketones to trans-β-nitrostyrene catalyzed by L-proline was investigated using microwave heating for rapid optimization of reaction conditions. The products could be obtained, easily in very short reaction times, high yields and comparable diastereo- and enantioselectivity with respect to the original procedures, under simple and more environmentally benign conditions such as the use of ethanol as the solvent and only a slight excess of the carbonyl compound.