The regiospecific nucleophilic substitution during the ruthenium catalyzed allylicalkylation of 1,3-unsymmetrical disubstituted allylic esters was demonstrated. The nucleophile was selectively introduced at the position originally substituted with leaving group in the 2-DPPBA or ip-pybox ligated [RuCl2(p-cymene)]2 catalyzed allylicalkylation of 1,3-unsymmetrical disubstituted allylic esters. The
作者:David L. Hughes、Michael Palucki、Nobuyoshi Yasuda、Robert A. Reamer、Paul J. Reider
DOI:10.1021/jo015871l
日期:2002.5.1
stereochemical memory effect in toluene and 1,2-dichloroethane, the reactions in these solvents can be carried to completion (dynamickineticasymmetrictransformation) and still provide product with excellent ee (>95%). The anion of dimethyl methylmalonate also reacts via a kinetic resolution, although the ee's, rates, and k(rel) values differ from those of the reactions with dimethyl malonate.
Aminocyclopentadienyl Ruthenium Complexes as Racemization Catalysts for Dynamic Kinetic Resolution of Secondary Alcohols at Ambient Temperature
作者:Jun Ho Choi、Yoon Kyung Choi、Yu Hwan Kim、Eun Sil Park、Eun Jung Kim、Mahn-Joo Kim、Jaiwook Park
DOI:10.1021/jo0355799
日期:2004.3.1
tests in the racemization of (S)-4-phenyl-2-butanol showed that 7 is the most active catalyst, although the difference decreased in the DKR. Complex 4 was used in the DKR of various alcohols; at room temperature, not only simple alcohols but also functionalized ones such as allylic alcohols, alkynyl alcohols, diols, hydroxyl esters, and chlorohydrins were successfully transformed to chiral acetates. In
<i>Pseudomonas</i>
sp. Lipase Immobilized on Magnetic Porous Polymer Microspheres as an Effective and Recyclable Biocatalyst for Resolution of Allylic Alcohols
作者:Yaohua Gu、Ping Xue
DOI:10.1002/jccs.201700424
日期:2018.6
reusability. In addition, the transesterificationresolution of (R,S)‐1‐(4‐methylphenyl)‐2‐propen‐1‐ol and (R,S)‐1‐(4‐bromophenyl)‐2‐propen‐1‐ol was catalyzed by PSL/Fe3O4@GEM, affording ideal ees and eep values of 99.3%, 97.4% and 99.6%, 98.2%, respectively. Therefore, PSL/Fe3O4@GEM demonstrated its potential as a highly efficient enzymatic reactor and Fe3O4@GEM would be very promising carriers for immobilizing
通过悬浮聚合制备含环氧基的磁性多孔聚合物微球(称为磁性Fe 3 O 4 @GEM微球)。Fe 3 O 4 @GEM的比表面积为30.41m 2 / g,平均孔径为17.13nm,孔体积为0.13cm 3 / g,表现出超顺磁性,饱和磁化强度为7.1EMu / g。Fe 3 O 4 @GEM上的环氧基含量为0.22 mmol / g。假单胞菌属。脂酶(PSL)被共价固定在Fe 3 O 4上@GEM微球通过酶的氨基与微球上的环氧基之间的反应。与游离PSL相比,PSL / Fe 3 O 4 @GEM对烯丙基醇拆分为相应的旋光性(S)-烯丙醇和(R)-烯丙醇乙酸酯具有增强的对映选择性。当使用固定化PSL进行酯交换拆分(R)时,前者(S)-1-苯-2-丙-1-醇的对映体过量(98.1%)是后者(1.2%)的81.7倍。S)-l-苯-2-基-1-醇。此外,ee s和ee pPSL / Fe 3 O 4
Kinetic resolution of allylic alcohols via stereoselective acylation catalyzed by lipase PS-30
作者:Peiran Chen、Peng Xiang
DOI:10.1016/j.tetlet.2011.08.093
日期:2011.11
By using lipase PS-30 as catalyst, the kineticresolution of a series of racemic allylic alcohols has been achieved via stereoselective acylation. The value of kinetic enantiomeric ratio (E) reached up to 968. Substituent effect is briefly discussed.