The synthesis of chiral β-ketosulfoxides by enantioselective oxidation and their stereocontrolled reduction to β-hydroxysulfoxides
摘要:
Various chiral non-racemic beta-ketosulfoxides, a class of compounds frequently used in asymmetric synthesis, were prepared in good yields by tert-butyl hydroperoxide oxidation of the corresponding sulfides in the presence of a complex between titanium and (S,S)-hydrobenzoin. The ee values of almost all of the purified products were > 98%. As ascertained by X-ray analysis and/or by NMR spectroscopy, the use of the (S,S)-form of the ligand led to aryl beta-ketosulfoxides with (R-S)-configuration and to methyl phenacyl sulfoxide with the (S-S)-configuration. Some of the aryl ketosulfoxides were subjected to reduction with DIBAL-H/ZnCl2 and the corresponding beta-sulfinylalcohols with an (R,R-S)-configuration produced. (c) 2005 Elsevier Ltd. All rights reserved.
Compounds, compositions and methods are provided that are useful in the treatment or prevention of a condition or disorder mediated by PPARγ or PPARδ. In particular, the compounds of the invention modulate the function of PPARγ or PPARδ. The subject methods are particularly useful in the treatment and/or prevention of diabetes, obesity, hypercholesterolemia, rheumatoid arthritis and atherosclerosis.
Chemoenzymatic synthesis of β-hydroxyl-sulfoxides by a two-step reaction of enzymatic reduction using Pseudomonas monteilii species and sulfoxidation with chiral titanium complexe
A two-step enantioselective synthetic strategy for the preparation of β-hydroxyl-sulfoxides has been described. With the enzymatic reduction of β-ketosulfides using Pseudomonas monteilii ZMU-T04 followed by the asymmetric sulfoxidation with Ti(OiPr)4/(S)-BINOL complexe, a wide range of corresponding β-hydroxyl-sulfoxide derivatives were smoothly obtained with excellent stereoselectivities (up to 99:1
已经描述了用于制备β-羟基亚砜的两步对映体选择性合成策略。通过使用Montesii monteilii ZMU-T04酶促还原β-酮硫醚,然后用Ti(O i Pr)4 /(S)-BINOL络合物进行不对称硫氧化,可以顺利地获得各种相应的β-羟基-亚砜衍生物。出色的立体选择性(高达99:1 dr和> 99%ee)。在控制实验的基础上,还提出了在β-羟基硫醚不对称硫氧化反应中,钛配合物可能存在的螯合物结构。
α-Benzoyloxylation of β-keto sulfides at ambient temperature
A facile and efficient protocol for the α-benzoyloxylation of β-keto sulfides is presented. This methodology provides a step-economical, mild and practical access to highly functionalized α-O-benzoyloxy substituted β-keto sulfides, including those with quaternary carbons, which are not easily obtained through currently available methods.
Methods and compositions for treating cervical cancer
申请人:——
公开号:US20040229298A1
公开(公告)日:2004-11-18
The invention provides methods and compositions for treating pathogen infections, particularly human papillomavirus infections. Specifically, the invention provides a method of screening that involves determining an effect of a candidate agent on binding of an E6 protein from an oncogenic strain of HPV to a polypeptide containing the amino acid sequence of a particular PDZ domain from the cellular protein MAGI-1. The invention provides methods to treat diseases associated with expression of pathogen proteins by modulating their interactions with MAGI-1, and a number of isolated peptides useful in such methods. Also provided are kits for performing the subject methods.