Design of Selenium-Based Chiral Chemical Probes for Simultaneous Enantio- and Chemosensing of Chiral Carboxylic Acids with Remote Stereogenic Centers by NMR Spectroscopy
作者:Sergey A. Shyshkanov、Nikolai V. Orlov
DOI:10.1002/chem.201602884
日期:2016.10.17
available amino alcohols. The probes developed were found to be efficient in chemoselective interaction with carboxylic functions of chiral substrates leading to diastereomeric amide formation and in sensing α‐, β‐, and remote (up to seven bonds away from the carboxylic group) chiral centers by using 77Se NMRspectroscopy. As a result, it was possible to determine the enantiomericratio of structurally
基于硒的对映纯手性化学探针是从可用的氨基醇开始以模块化方式设计的。发现开发的探针可有效地与手性底物的羧基官能团进行化学选择性相互作用,从而导致非对映异构体酰胺的形成,并通过使用77 Se来检测手性中心的α-,β-和较远的手性中心(距离羧基最多7个键)NMR光谱。结果,可以高精度地确定包括多官能化合物和药物在内的结构多样的各个手性酸的对映体比率。通过使用含硒和氟的双功能手性探针,已经成功开发了一种分析粗制反应混合物的方法。更重要的是,据透露,基于获得的77 Se NMR数据,有可能获得有关手性中心取代基的位置和性质的主要信息(化学和对映体传感),这可以简化复杂化合物的结构阐明。衍生过程只需5分钟,可以直接在NMR管中进行,然后进行NMR测量,而无需任何分离和纯化步骤。
Nucleophilic trifluoromethylation of conjugate acceptors via phenyl trifluoromethyl sulfone
作者:Kaumba Sakavuyi、Kimberly S. Petersen
DOI:10.1016/j.tetlet.2013.08.132
日期:2013.11
A mild procedure for the conjugate addition of the trifluoromethyl anion to activated Michael acceptors such as arylidenemalononitriles (15 examples) and arylidene Meldrum's acids (9 examples) using phenyl trifluoromethyl sulfone through a reductive magnesium metal mediated procedure is described. The new methodology is used to prepare befloxatone, a reversible and selective monoamine oxidase A inhibitor. (C) 2013 Elsevier Ltd. All rights reserved.
Nucleophilic trifluoromethylation of arylidene Meldrum’s acids
作者:Artem A. Zemtsov、Vitalij V. Levin、Alexander D. Dilman、Marina I. Struchkova、Pavel A. Belyakov、Vladimir A. Tartakovsky
DOI:10.1016/j.tetlet.2009.03.188
日期:2009.6
A method for the trifluoromethylation of arylidene Meldrum's acids using Me3SiCF3 followed by transformation of the initial products to CF3-substituted esters and alcohols is described. The sequence of reactions is performed without isolation of intermediate compounds furnishing the final products in good overall yields. (C) 2009 Elsevier Ltd. All rights reserved.
JPH06107584A
申请人:——
公开号:JPH06107584A
公开(公告)日:1994-04-19
Synthesis and Properties of Optically Active α-Trifluoromethylbenzyl Derivatives as New Chiral Dopants for Ferroelectric Liquid Crystals
作者:Yoshio Aoki、Hiroyuki Nohira
DOI:10.1246/cl.1993.113
日期:1993.1
Optically active α-trifluoromethylbenzyl derivatives as new chiral dopants for ferroelectric liquidcrystals (FLCs) were synthesized utilizing optically active 4,4,4-trifluoro-3-(4-methoxyphenyl)butanoic acid prepared by optical resolution procedures. The magnitudes of spontaneous polarization (Ps) and the response time depended on the type of the linkage between the optically active block and core