Fully Enzymatic Resolution of Chiral Amines: Acylation and Deacylation in the Presence of<i>Candida antarctica</i>Lipase B
作者:Hilda Ismail、Rute Madeira Lau、Fred van Rantwijk、Roger A. Sheldon
DOI:10.1002/adsc.200800091
日期:2008.7.7
(CaLB)-catalyzed acylation with N-methyl- and N-phenylglycine, as well as analogues having the general formula R1XCH2CO2R2 (R1=Me, Ph; X=O, S) afforded the corresponding enantioenriched amides, which were subsequently enzymatically hydrolyzed. Surprisingly, CaLB also proved to be the catalyst of choice for this latter step. The heteroatom in the acyl donor profoundly influences both the enzymatic acylation and
已经证明了用于拆分手性胺的完全酶促方法。南极假丝酵母脂肪酶B(CaLB)催化的N-甲基和N-苯基甘氨酸酰化反应以及具有通式R 1 X CH 2 CO 2 R 2(R 1的类似物=我,Ph;X = O,S)得到相应的对映体富集的酰胺,其随后被酶水解。出乎意料的是,CaLB也被证明是此后一步的选择催化剂。酰基供体中的杂原子深刻影响酶的酰化作用和脱酰作用。就合成和水解中的对映选择性以及反应速率而言,O-取代的试剂表现最佳。
Mesoporous Core–Shell Nanostructures Bridging Metal and Biocatalyst for Highly Efficient Cascade Reactions
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)。
Method for preparing optically active amines
申请人:Postech Academy-Industry Foundation
公开号:US07592488B2
公开(公告)日:2009-09-22
The present invention relates to a method of preparing optically active amines and chiral amines prepared thereby. The method includes reacting an amine compound, a metal catalyst, a biocatalyst including a lipase, and an acyl donor compound in an organic solvent to obtain a chiral amide compound, and then hydrolyzing the chiral amide compound to obtain a chiral amine.
The present invention relates to a novel process for the preparation of esters of the general formula I
from compounds of the general formula II contained in aqueous solutions
which comprises
a) extracting the compounds of the general formula II directly or after liberation from their salts in the presence of a C1-C8-alcohol and a water-immiscible solvent and
b) then esterifying with the C1-C8-alcohol in the presence of a catalyst and of an entraining agent under the conditions of an azeotropic distillation,
where the process steps (a) and (b) can be carried out separately in terms of time and space or else in a successive continuous or batchwise sequence and where the variables and substituents in the formulae I and II have the following meanings:
R1=F, Cl, —OH, —OC1-C10-alkyl,
R2=H, C1-C10-alkyl;
R3=C1-C8-alkyl,
Q=—OH, —O−K+, where K+ is an alkali metal cation or alkaline earth metal cation,
n=0, 1 or 2.
[EN] SYNTHESIS OF AMIDES AND AMINES FROM ALDEHYDES OR KETONES BY HETEROGENEOUS METAL CATALYSIS<br/>[FR] SYNTHÈSE D'AMIDES ET D'AMINES À PARTIR D'ALDÉHYDES OU DE CÉTONES PAR CATALYSE MÉTALLIQUE HÉTÉROGÈNE
申请人:CÓRDOVA ARMANDO
公开号:WO2016096905A1
公开(公告)日:2016-06-23
This invention concerns the first mild and efficient synthesis of primary amines and amides from aldehydes or ketones using a heterogeneous metal catalystand amine donor. The initial heterogeneous metal- catalyzed reaction between the carbonyl and the amine donor components is followed up with the addition of a suitable acylating agent component in one-pot. Hence, the present invention provides a novel catalytic one-pot three-component synthesis of amides. Moreover, the integration of enzyme catalysis allows for eco-friendly one-pot co-catalytic synthesis ofamides from aldehyde and ketone substrates, respectively. The process can be applied to the co-catalytic one-pot three-component synthesis of capsaicin and its analogues from vanillin or vanillyl alcohol. It can also be applied for asymmetric synthesis. In the present invention, a novel co-catalytic reductive amination/dynamic kinetic resolution (dkr) relay sequence for the asymmetric synthesis of optically active amides from ketones is disclosed. Moreover, implementation of a catalytic reductive amination/kinetic resolution (kr) relay sequence produces the corresponding optically active amide product and optical active primary amine product with the opposite stereochemistry from the starting ketones.