l-Lysine Functionalized Polyacrylonitrile Fiber: A Green and Efficient Catalyst for Knoevenagel Condensation in Water
作者:Pengyu Li、Yuanyuan Liu、Ning Ma、Wenqin Zhang
DOI:10.1007/s10562-017-2287-y
日期:2018.3
by grafting the l-lysine into a commercially available polyacrylonitrile fiber and showed highly catalytic activity for Knoevenagelcondensation reaction. With low temperature (45 °C) and short reaction time (1 h), the fiber catalyst was well applicable to Knoevenagelcondensation of a wide range of aldehydes and the yields could reach up to 99%. Interestingly, only in water could the reaction take
Six lipases were screened for their ability to catalyse the Knoevenagel condensation between benzaldehyde and methyl cyanoacetate. Lipase from porcine pancreas tolerated a variety of functional groups on the aromatic ring, produced the highest yields, and also catalysed transesterification of the product in the presence of an alcoholic cosolvent. We show that, in organic solvents, lipase from porcine pancreas has higher activity for this “promiscuous” reaction than for naturally occurring esterification catalysis.
Prolinamide functionalized polyacrylonitrile fiber with tunable linker length and surface microenvironment as efficient catalyst for Knoevenagel condensation and related multicomponent tandem reactions
attaching amines to fiber matrix as well as the constructed hydrophobic microenvironment by linker group within the surface layers of fiber materials effectively promotes the reactions. In addition, the good swollen capacity of fiber in solvent ensure that the reaction proceed well. Fiber catalyst PANPA−2F modified by prolinamide with a C2 alkyl chain exhibited the best catalytic performance and can