设计了具有PdPt双金属核和固定有酶的聚多巴胺(PDA)壳的介孔核-壳结构纳米催化剂,其中PDA壳用作将双金属核和酶置于分离位置的屏障。核和壳的可及的介孔结构显着促进了传质和催化剂的利用,提高了级联反应中的协同催化能力。所获得的双功能纳米催化剂实现了不同类型的有效的两步式一锅级联反应:伯胺在有机溶剂中的动态动力学拆分,具有高收率和对映选择性(高达99%的收率和98%ee),以及降解有机磷神经毒剂。高速率常数和周转频率数值(0.8分钟–1和20 min –1分别)。
significantly facilitate mass transfer and catalyst utilization, improving the synergistic catalytic abilities in cascadereactions. The obtained bifunctional nanocatalysts enabled efficient two-stepone-potcascadereactions of different types: dynamic kinetic resolution of primaryamines in organic solvent with high yield and enantioselectivity (up to 99% yield and 98% ee) and degradation of organophosphate
设计了具有PdPt双金属核和固定有酶的聚多巴胺(PDA)壳的介孔核-壳结构纳米催化剂,其中PDA壳用作将双金属核和酶置于分离位置的屏障。核和壳的可及的介孔结构显着促进了传质和催化剂的利用,提高了级联反应中的协同催化能力。所获得的双功能纳米催化剂实现了不同类型的有效的两步式一锅级联反应:伯胺在有机溶剂中的动态动力学拆分,具有高收率和对映选择性(高达99%的收率和98%ee),以及降解有机磷神经毒剂。高速率常数和周转频率数值(0.8分钟–1和20 min –1分别)。
Chemoenzymatic synthesis of the calcimimetics (+)-NPS R-568 via asymmetric reductive acylation of ketoxime intermediate
作者:Kiwon Han、Yunwoong Kim、Jaiwook Park、Mahn-Joo Kim
DOI:10.1016/j.tetlet.2010.04.121
日期:2010.7
A practical and efficient procedure for the synthesis of a potent calcimimetic (+)-NPS R-568 was developed. This procedure includes as the key step the asymmetric reductiveacylation of a ketoxime intermediate catalyzed by a Pd nanocatalyst and a lipase in combination. The target compound was prepared from commercially available 3′-methoxyacetophenone via five steps in overall 63% yield.
nanopores were fabricated by co-immobilizing metal nanoparticles and enzymes into the dendritic organosilica nanoparticles. They demonstrated highly improved catalytic performance in chemoenzymatic asymmetric synthesis of chiral amines and alcohols. The hydrophobic microenvironment proved to be critical to enhancedstability, activity and cascade efficiency.