Catalytic Enantioselective [2,3]-Rearrangements of Allylic Ammonium Ylides: A Mechanistic and Computational Study
作者:Thomas H. West、Daniel M. Walden、James E. Taylor、Alexander C. Brueckner、Ryne C. Johnston、Paul Ha-Yeon Cheong、Guy C. Lloyd-Jones、Andrew D. Smith
DOI:10.1021/jacs.6b11851
日期:2017.3.29
A mechanistic study of the isothiourea-catalyzed enantioselective [2,3]-rearrangement of allylic ammonium ylides is described. Reaction kinetic analyses using 19F NMR and density functional theory computations have elucidated a reaction profile and allowed identification of the catalyst resting state and turnover-rate limiting step. A catalytically relevant catalyst–substrate adduct has been observed
Substituted 3-phenylpropionic acids and the use thereof
申请人:Bayer Intellectual Property GmbH
公开号:US09018414B2
公开(公告)日:2015-04-28
The present application relates to novel 3-phenylpropionic acid derivatives, to processes for their preparation, to their use for the treatment and/or prevention of diseases and to their use for preparing medicaments for the treatment and/or prevention of diseases, in particular for the treatment and/or prevention of cardiovascular disorders.
Enantioselective Sulfonium–Claisen Rearrangement with Cinnamyl Thioethers
作者:Jiwon Jang、Youngjin Bae、Seunghoon Shin
DOI:10.1021/acs.orglett.3c01244
日期:2023.6.2
Sulfonium–Claisen rearrangement leveraged by the gold-catalyzed formation of allyl sulfonium intermediates has enabled an exceptional level of regio- and enantiocontrol for the synthesis of skipped 1,4-dienes. However, the application of cinnamyl thioether derivatives to the sulfonium–Claisen rearrangement has been unsuccessful so far due to the extensive dissociation of the cinnamyl cation. By fine-tuning
Structure Mechanism Insights and the Role of Nitric Oxide Donation Guide the Development of Oxadiazole-2-Oxides as Therapeutic Agents against Schistosomiasis
作者:Ganesha Rai、Ahmed A. Sayed、Wendy A. Lea、Hans F. Luecke、Harinath Chakrapani、Stefanie Prast-Nielsen、Ajit Jadhav、William Leister、Min Shen、James Inglese、Christopher P. Austin、Larry Keefer、Elias S. J. Arnér、Anton Simeonov、David J. Maloney、David L. Williams、Craig J. Thomas
DOI:10.1021/jm901021k
日期:2009.10.22
Schistosomiasis is a chronic parasitic disease affecting hundreds of millions of individuals worldwide. Current treatment depends on a single agent, praziquantel, raising concerns of emergence of resistant parasites. Here, we continue our explorations of an oxadiazole-2-oxide class of compounds we recently identified as inhibitors of thioredoxin glutathione reductase (TGR), a selenocysteine-containing flavoenzyme required by the parasite to maintain proper cellular redox balance. Through systematic evaluation of the core molecular structure of this chemotype, we define the essential pharmacophore, establish a link between the nitric oxide donation and TGR inhibition, determine the selectivity for this chemotype versus related reductase enzymes, and present evidence that these agents can be modified to possess appropriate drug metabolism and pharmacokinetic properties. The mechanistic link between exogenous NO donation and parasite injury is expanded and better defined. The results of these studies verify the utility of oxadiazole-2-oxides as novel inhibitors of TGR and as efficacious antischistosomal agents.
Synthesis of oxadiazole-2-oxide analogues as potential antischistosomal agents
作者:Ganesha Rai、Craig J. Thomas、William Leister、David J. Maloney
DOI:10.1016/j.tetlet.2009.01.120
日期:2009.4
The synthesis of several 1,2,5-oxadiazole-2-oxide (Furoxan) analogues is described herein. These compounds were prepared in an effort to probe the SAR around the phenyl substituent and oxadiazole core for our studies toward thioredoxin-glutathione reductase (TGR) inhibition and antischistosomal activity. Published by Elsevier Ltd.