Mapping the substrate selectivity of new hydrolases using colorimetric screening: lipases from Bacillus thermocatenulatus and Ophiostoma piliferum, esterases from Pseudomonas fluorescens and Streptomyces diastatochromogenes
作者:Andrew Man Fai Liu、Neil A Somers、Romas J Kazlauskas、Terry S Brush、Frank Zocher、Markus M Enzelberger、Uwe T Bornscheuer、Geoff P Horsman、Alessandra Mezzetti、Claudia Schmidt-Dannert、Rolf D Schmid
DOI:10.1016/s0957-4166(01)00072-6
日期:2001.3
screened a general library of 29 substrates and a chiral library of 23 pairs of enantiomers. All four hydrolases catalysed the hydrolysis of unnatural substrates, but the two lipases accepted a broader range of substrates than the two esterases. As expected, the two lipases favoured more hydrophobic substrates, while the two esterases showed a preference for smaller substrates. Several moderately enantioselective
Removal of the acyl donor residue allows the use of simple alkyl esters as acyl donors for the dynamic kinetic resolution of secondary alcohols
作者:Gerard K.M. Verzijl、Johannes G. de Vries、Quirinus B. Broxterman
DOI:10.1016/j.tetasy.2005.02.028
日期:2005.5
dynamic kinetic resolution of secondary alcohols using a lipase and a ruthenium catalyst as developed by Bäckvall required some improvements to make it suitable for its use in an industrial process. The use of p-chlorophenyl acetate as acyldonor is not desirable in view of the toxicity of the side product. We herein report that simple alkyl esters can be used as acyldonors if the alcohol or ketone residue
thickness were synthesized and used as racemization catalysts in the one‐pot dynamickineticresolution (DKR) of secondary alcohols by using lipase‐catalyzed transesterification. The inert Silicalite‐1 shell covered the external acidic sites of the Beta zeolite core, suppressing dehydration and non‐enantioselective transesterification of the alcohol. The alcohols could penetrate the Silicalite‐1 shell
New air-stable iron catalyst for efficient dynamic kinetic resolution of secondary benzylic and aliphatic alcohols
作者:Qiong Yang、Na Zhang、Mingke Liu、Shaolin Zhou
DOI:10.1016/j.tetlet.2017.05.038
日期:2017.6
catalyst system for the dynamic kineticresolution of secondaryalcohols by combining the enzymatic resolution with an iron-catalyzed racemization. A new air-stable tricarbonyl (cyclopentadienone)iron complex is identified as the active racemization catalyst for this transformation without any additive. Various substrates including benzylic, heteroaromatic, aliphatic alcohols can be used and afford the
3-Acyloxypyridines and 4-acetyl-1,2,4-triazole were found to react enantioselectively with (RS)-1-phenylethanol to give (R)-1-phenethyl carboxylates in high purity, catalyzed by lipase P (from Pseudomonas fluorescens).