95342-42-0

Upstream product

• 95262-84-3 2-(4-chlorophenoxy)propanoic acid methyl ester 
• 17392-83-5 (R)-Methyl lactate 
• 106-48-9 4-chloro-phenol 
• 3307-39-9 2-(4-chlorophenoxy)propionic acid 
• 186581-53-3 diazomethane 
• 67-56-1 methanol 

Downstream Products

• 3307-39-9 (S)-2-(4-chlorophenoxy)propionic acid 

Relevant academic research and scientific papers

Identification of anthranilic acid derivatives as a novel class of allosteric inhibitors of hepatitis C NS5B polymerase

A series of potent anthranilic acid-based inhibitors of the hepatitis C NS5B polymerase has been identified. The inhibitors bind to a site on NS5B between the thumb and palm regions adjacent to the active site as determined by X-ray crystallography of the enzyme-inhibitor complex. Guided by both molecular modeling and traditional SAR, the enzyme activity of the initial hit was improved by approximately 100-fold, yielding a series of potent and selective NS5B inhibitors with IC50 values as low as 10 nM. These compounds were also inhibitors of the HCV replicon in cultured HUH7 cells.

Enantioselective hydrolysis of some 2-aryloxyalkanoic acid methyl esters and isosteric analogues using a penicillin G acylase-based HPLC monolithic silica column

A technique based on liquid chromatography has been developed to facilitate studies of enantioselectivity in penicillin G acylase (PGA)-catalyzed hydrolysis of some 2-aryloxyalkanoic acid methyl esters and isosteric analogues. PGA was covalently immobilized on an aminopropyl monolithic silica support to create an immobilized HPLC-enzyme reactor. Two sets of experimental data were drawn to calculate the enantioselectivity (E) of the kinetically controlled enantiomer-differentiating reaction, the degree of substrate conversion and the enantiomeric excess of the product. The developed enzymatic reactor was coupled through a switching valve to an achiral analytical column for separation and quantitation of the hydrolysis products. The enantiomeric excess was determined off-line on a PGA-chiral stationary phase. In this way, highly precise E values were determined. A computational study related to the hydrolysis of the considered racemic esters was also carried out in order to unambiguously clarify both the substrate specificity and the enantioselectivity displayed by PGA.

Candida cylindracea lipase-mediated kinetic resolution of α-substituted α-aryloxyacetic acid methyl esters

Hydrolysis of several α-alkyl-α-aryloxyacetic acid methyl esters and of α-methyl-α-(n-propyl)-α-(p-chlorophenoxy)acetic acid methyl ester were performed in the presence of Candida cylindracea lipase. The α-alkyl-α-aryloxyacetic acid methyl esters and α-methyl-α-(n-propyl)-α-(p-chlorophenoxy)acetic acid methyl ester were incubated in buffer phosphate (pH 7-8). The reaction mixture, containing the unreacted ester and corresponding acid, showed enantiomeric excesses (ee) up to 81%. The extent of conversion was quite low for the α-methyl-α-(n-propyl)-α-(p-chlorophenoxy)acetic acid methyl ester, the corresponding acid was obtained with ee > 98%.

Enantioselective inhibition: a strategy for improving the enantioselectivity of biocatalytic systems

Dextromethorphan (DM) and levomethorphan (LM) were found to be effective enantioselective inhibitors of Candida cylindracea lipase-catalyzed hydrolysis of a variety of (±)-arlypropionic and (±)-(arloxy)propionic esters. The enantioselectivity of the biocatalytic resolution of (±)-methyl 2-(2,4-dichlorophenoxy)propionate (DCPP) was enhanced 20-fold in the presence of either DM or LM. A general model for enantioselective inhibition has been developed, and a quantitative expression has been derived to show the underlying parameters that govern enantioselective inhibition. To define the mechanism of action of DM, a series of kinetic inhibition experiments was conducted with enantiomerically pure (R)-(+)-DCPP and (S)-(-)-DCPP. The observed inhibition pattern was that of partial noncompetitive inhibition for (R)-(+)-DCPP and that of pure noncompetitive inhibition for (S)-(-)-DCPP.

Enzyme catalysed hydrolysis of chlorophenoxypropionates

We report on the enzymatic hydrolysis of methyl 2-phenoxypropionate and of the following chlorinated derivatives: methyl o-chloro-, m-chloro-, p-chloro-, and o,p-dichloro-2-phenoxypropionates. α-Chymotripsyn, lipase, and pig liver esterase have an R enantioselectivity whereas subtilisin has an S enantioselectivity.Enantiomeric excess (e.e.) cover a wide range (from 5 to 100percent).

Resolution of Racemic Mixtures via Lipase Catalysis in Organic Solvents

Yeast lipase and porcine pancreatic lipase have been found to vigorously function in nearly anhydrous organic solvents and catalyze the reactions of esterification and transesterification, respectively, in highly stereoselective manner.With use of these enzymatic processes, a number of optically active alcohols, carboxylic acids, and their esters have been prepared on a gram scale.