Reaction of caesium 4-chlorophenate and chlorohydrins from threonines: synthesis of clofibrate analogues
摘要:
Clofibrate is a well-known peroxisome prolifierator-activated receptor-alpha (PPARalpha) agonist, used in the treatment of hyperlipaemias and atherosclerosis and to prevent heart failure. Herein, the preparation of the four enantiomerically pure stereoisomers of ethyl 2-(4-chlorophenoxy)-3-hydroxybutanoate as clofibrate analogues is described. Biological evaluation of these new compounds was performed by a transactivation assay in a transiently transfected monkey kidney fibroblast cell line. All four diastereomers were inactive even at 300 muM, where clofibrate showed an evident activity, suggesting that the designed clofibrate molecular structural modifications in the analogues caused the loss of peroxisome proliferator-activated receptor-alpha (PPARalpha) activity. (C) 2005 Elsevier Ltd. All rights reserved.
Stereoselective, Biocatalytic Reductions of α-Chloro-β-keto Esters
摘要:
Eighteen known and putative reductases from baker's yeast (Saccharomyces cerevisiae) were tested for the ability to reduce a series of alpha-chloro-beta-keto esters. In nearly all cases, it was possible to produce at least two of the four possible alpha-chloro-beta-hydroxy ester diastereomers with high optical purities. The utility of this approach was demonstrated by reducing ethyl 2-chloroacetoacetate to the corresponding Syn-(2R,3S)-alcohol on a multigram scale using whole cells of an Escherichia coli strain overexpressing a single yeast reductase identified from the screening studies.
Several aliphatic or aromatic 2-chloro-3-oxoesters are stereoselectively reduced by yeast or fungal strains, affording in fair to good yield and high enantiomeric excess some of the respective 2-chloro-3-hydroxyester stereoisomers.
Stereoselective, Biocatalytic Reductions of α-Chloro-β-keto Esters
作者:Iwona A. Kaluzna、Brent D. Feske、Weerawut Wittayanan、Ion Ghiviriga、Jon D. Stewart
DOI:10.1021/jo0484981
日期:2005.1.1
Eighteen known and putative reductases from baker's yeast (Saccharomyces cerevisiae) were tested for the ability to reduce a series of alpha-chloro-beta-keto esters. In nearly all cases, it was possible to produce at least two of the four possible alpha-chloro-beta-hydroxy ester diastereomers with high optical purities. The utility of this approach was demonstrated by reducing ethyl 2-chloroacetoacetate to the corresponding Syn-(2R,3S)-alcohol on a multigram scale using whole cells of an Escherichia coli strain overexpressing a single yeast reductase identified from the screening studies.
Reaction of caesium 4-chlorophenate and chlorohydrins from threonines: synthesis of clofibrate analogues
作者:Maria Grazia Perrone、Ernesto Santandrea、Leonardo Di Nunno、Antonio Scilimati、Vincenzo Tortorella、Francesco Capitelli、Valerio Bertolasi
DOI:10.1016/j.tetasy.2005.01.006
日期:2005.2
Clofibrate is a well-known peroxisome prolifierator-activated receptor-alpha (PPARalpha) agonist, used in the treatment of hyperlipaemias and atherosclerosis and to prevent heart failure. Herein, the preparation of the four enantiomerically pure stereoisomers of ethyl 2-(4-chlorophenoxy)-3-hydroxybutanoate as clofibrate analogues is described. Biological evaluation of these new compounds was performed by a transactivation assay in a transiently transfected monkey kidney fibroblast cell line. All four diastereomers were inactive even at 300 muM, where clofibrate showed an evident activity, suggesting that the designed clofibrate molecular structural modifications in the analogues caused the loss of peroxisome proliferator-activated receptor-alpha (PPARalpha) activity. (C) 2005 Elsevier Ltd. All rights reserved.