PAA-supported Hantzsch 1,4-dihydropyridine ester: an efficient catalyst for the hydrogenation of α,β-epoxy ketones
摘要:
A new type of water-soluble polymer-supported NADH co-enzyme model-FAA (polyacrylic acid)-supported Hantzsch 1,4-dihydropyridine ester (PM-HEH) was designed and synthesized. Catalytic amount of the supported reagent was used in the hydrogenation of alpha,beta-epoxy ketones to the corresponding beta-hydroxy ketones and showed great catalytic efficiency in the reduction reaction. This PAA-HEH was an optimal potential for recycling use. (C) 2013 Elsevier Ltd. All rights reserved.
By judicious choice of the counter anions in the vanadyl catalysts, we can achieve β-hydroxylated and t-butyl peroxylated carbonylation of styrenes by aromatic 1° and 2° alkyl aldehydes in a complementary manner.
Clay montmorillonite K10 catalyzed aldol-type reaction of aldehydes with silyl enol ethers in water
作者:Teck-Peng Loh、Xu-Ran Li
DOI:10.1016/s0040-4020(99)00594-3
日期:1999.8
for the cross aldol reaction of silyl enol ethers and ketene silyl acetal with various aldehydes using montmorillonite K10 is described. Cheap and commercially available montmorillonite K10 can be used without the need of an ion exchange process under solvent-free conditions or in water. Hydrate of aldehydes such as glyoxylic acid can be used directly. Thermal treatment of K10 increased the catalytic
A general method for the aldol condensation of aromatic ketones with aldehydes was developed under continuous-flow conditions using a commercially available, strongly basic anion-exchange resin (A26) as catalyst. This procedure, in addition to exhibiting a wide substrate scope, promoted carbon–carbon bond formation under mild conditions using a quasi-stoichiometric ratio of starting reagents with good
Magnetic Nano-Fe<sub>3</sub>O<sub>4</sub>-Supported 1-Benzyl-1,4-dihydronicotinamide (BNAH): Synthesis and Application in the Catalytic Reduction of α,β-Epoxy Ketones
A novel magnetically recoverable organichydridecompound was successfully constructed by using silica-coated magnetic nanoparticles as a support. An as-prepared magnetic organichydridecompound, BNAH (1-benzyl-1,4-dihydronicotinamide), showed efficient activity in the catalytic reduction of α,β-epoxy ketones. After reaction, the magnetic nanoparticle-supported BNAH can be separated by simple magnetic