Two Approaches for CAL-B-Catalyzed Enantioselective Deacylation of a Set of α-Phenyl Ethyl Esters: Organic Solvent with Sodium Carbonate and Micro-aqueous Medium
buffer solution pH 7 in the second. The results show the high efficiency of the deacylation in the presence of the sodium carbonate for the enzymatic resolution of all the esters and that in term of reactivity (31% ≤ conv ≤ 50%) and selectivity (E > 200). While, during the hydrolysis in micro-aqueous media, the conversion is strongly affected by the length of the acyl-chain side, the conversion decreases
Low-temperature enzymatic hydrolysis resolution in mini-emulsion media
作者:Nuno M. T. Lourenço、Sara C. Matias、Margarida C. Altas、Luis P. Fonseca
DOI:10.1515/chempap-2015-0032
日期:2015.1.1
mini-emulsion size was observed. For the longer 1-phenylethyl ester, 1-phenylethyl dodecanoate, the enzymatic resolution was promoted exclusively at low temperatures. The preparative mini-emulsion enzymatic reaction of 1-phenylethyl dodecanoate at 4 °C afforded the isolation of (R)-phenylethanol with a yield of 36 % with an ee of 99 %. (S)-Phenylethanol was isolated with a 51 % yield with an ee of 79 %.
The use of fatty and aromatic acids as green acyl donors for enzymatic kinetic resolution via esterification of 1-phenylethanol and 1-phenylpropan-2-ol was described. The impact of the presence of magnesium sulfate on both reactivity and selectivity of Candidarugosalipase (CRL) was checked. The organic solvents, the medium dilution, and the temperature revealed as determinant parameters to achieve
Optical resolution for producing optically active alcohol
申请人:The Nisshin Oil Mills, Ltd.
公开号:EP0709465A2
公开(公告)日:1996-05-01
A process for producing an optically active alcohol comprising carrying out interesterification between a racemic alcohol and an ester selected from the group consisting of (a) a diester between a lower monohydric alcohol and a saturated dicarboxylic acid having 14 or more carbon atoms, (b) a triglyceride of a saturated fatty acid having 16 or more carbon atoms, and (c) a monoester between a lower monohydric alcohol and a saturated fatty acid having 18 or more carbon atoms in the presence of lipase, preferably heat-resistant lipase, and in the presence or absence of a solvent, preferably in the absence of a solvent, under a substantially water-free condition, separating an optically active alcohol rich in either one of R- and S-forms from the reaction mixture, and adding an optically inactive non-racemic alcohol to the residue of the previous step to carry out interesterification under the same conditions as in the previous reaction to separate the other enantiomer.
According to the present invention a racemic alcohol can easily be resolved into each enantiomer with high purity in good yield.
一种生产光学活性醇的工艺,包括在脂肪酶存在下,在外消旋醇和选自以下组别的酯 之间进行酯化反应:(a)低级一元醇与具有 14 个或更多碳原子的饱和二羧酸之间的二酯;(b)具有 16 个或更多碳原子的饱和脂肪酸的甘油三酯;(c)低级一元醇与具有 18 个或更多碳原子的饱和脂肪酸之间的单酯、在有或无溶剂(最好是无溶剂)的条件下,在基本上无水的条件下,从反应混合物中分离出富含 R 型和 S 型中任一型的光学活性醇,并将光学不活泼的非外消旋醇加入到上一步的残留物中,在与上一步反应相同的条件下进行酯交换反应,以分离出另一种对映体。
根据本发明,外消旋醇可以很容易地以高纯度和高产率分离成每种对映体。
Enzymatic resolution of alcohols via lipases immobilized in microemulsion-based gels
作者:Paulo Cesar de Jesus、Marcos Caroli Rezende、Maria da Graça Nascimento
DOI:10.1016/0957-4166(94)00352-c
日期:1995.1
Lipases immobilized in microemulsion-based gel (MBG) were used in the resolution of racemic alcohols, in a new, convenient method of catalysis in organic solvents which employs small amounts of the enzyme.