Design, synthesis and activity of novel derivatives of Oxybutynin and Tolterodine
摘要:
Novel derivatives of Tolterodine (1) and Oxybutynin (2) have been designed using conformationally restricted azabicyclics as replacement for open-chain amines. The synthesis and structure-activity relationships are presented. (c) 2005 Elsevier Ltd. All rights reserved.
Design, synthesis and activity of novel derivatives of Oxybutynin and Tolterodine
摘要:
Novel derivatives of Tolterodine (1) and Oxybutynin (2) have been designed using conformationally restricted azabicyclics as replacement for open-chain amines. The synthesis and structure-activity relationships are presented. (c) 2005 Elsevier Ltd. All rights reserved.
Asymmetric synthesis of 3,3,5,5-tetrasubstituted 1,2-dioxolanes: total synthesis of epiplakinic acid F
作者:Xiang-Yin Tian、Jian-Wei Han、Qiong Zhao、Henry N. C. Wong
DOI:10.1039/c4ob00448e
日期:——
The first enantioselective totalsynthesis of epiplakinic acid F (1) was achieved through a pivotal step involving a radical-mediated asymmetric peroxidation of vinylcyclopropanes with molecular oxygen to construct highly substituted 1,2-dioxolanes. Subsequent conversions of the chiral 1,2-dioxolanes led to totalsynthesis of epiplakinic acid F (1) and the confirmation of its absolute configuration
Cyclopropane-1,2-dicarboxylic acids as new tools for the biophysical investigation of<i>O</i>-acetylserine sulfhydrylases by fluorimetric methods and saturation transfer difference (STD) NMR
Cysteine is a building block for many biomolecules that are crucial for living organisms. O-Acetylserine sulfhydrylase (OASS), present in bacteria and plants but absent in mammals, catalyzes the last step of cysteine biosynthesis. This enzyme has been deeply investigated because, beside the biosynthesis of cysteine, it exerts a series of "moonlighting" activities in bacteria. We have previously reported a series of molecules capable of inhibiting Salmonella typhimurium (S. typhymurium) OASS isoforms at nanomolar concentrations, using a combination of computational and spectroscopic approaches. The cyclopropane-1,2-dicarboxylic acids presented herein provide further insights into the binding mode of small molecules to OASS enzymes. Saturation transfer difference NMR (STD-NMR) was used to characterize the molecule/ enzyme interactions for both OASS-A and B. Most of the compounds induce a several fold increase in fluorescence emission of the pyridoxal 5'-phosphate (PLP) coenzyme upon binding to either OASS-A or OASS-B, making these compounds excellent tools for the development of competition-binding experiments.
Cyclopropane derivatives as potential human serine racemase inhibitors: unveiling novel insights into a difficult target
D-Serine is the co-agonist of NMDA receptors and binds to the so-called glycine site. D-Serine is synthesized by human serine racemase (SR). Over activation of NMDA receptors is involved in many neurodegenerative diseases and, therefore, the inhibition of SR might represent a novel strategy for the treatment of these pathologies. SR is a very difficult target, with only few compounds so far identified exhibiting weak inhibitory activity. This study was aimed at the identification of novel SR inhibitor by mimicking malonic acid, the best-known SR inhibitor, with a cyclopropane scaffold. We developed, synthesized, and tested a series of cyclopropane dicarboxylic acid derivatives, complementing the synthetic effort with molecular docking. We identified few compounds that bind SR in high micromolar range with a lack of significant correlation between experimental and predicted binding affinities. The thorough analysis of the results can be exploited for the development of more potent SR inhibitors.