Über die Enantiomerentrennung durch Verteilung zwischen flüssigen Phasen. 3. Mitteilung. Selektivität der lipophilen Weinsäureester für chirale Ammonium-Salze verschiedener Konstitution und Konfiguration
Separation of Enantiomers by Partition between Liquid Phases. 3. Communication. Selectivity of Lipophilic Tartaric Acid Esters for Chiral Ammonium Salts of Different Constitution and Configuration
通过液相之间的分配分离对映异构体。3.沟通。亲脂性酒石酸酯对不同组成和构型的手性铵盐的选择性
Azetidine, pyrrolidine and piperidine derivatives
申请人:Merck Sharp & Dohme, Ltd.
公开号:US05854268A1
公开(公告)日:1998-12-29
A class of substituted azetidine, pyrrolidine and piperidine derivatives are selective agonists of 5-HT.sub.1 -like receptors, being potent agonists of the human 5-HT.sub.1D.alpha. receptor subtype whilst possessing at least a 10-fold selective affinity for the 5-HT.sub.1D.alpha. receptor subtype relative to the 5-HT.sub.1D.beta. subtype; they are therefore useful in the treatment and/or prevention of clinical conditions, in particular migraine and associated disorders, for which a subtype-selective agonist of 5-HT.sub.1D receptors is indicated, whilst eliciting fewer side-effects, notably adverse cardiovascular events, than those associated with non-subtype-selective 5-HT.sub.1D receptor agonists.
Synthesis of enantiopure 2-amino-1-phenyl and 2-amino-2-phenyl ethanols using enantioselective enzymatic epoxidation and regio- and diastereoselective chemical aminolysis
作者:Guido Sello、Fulvia Orsini、Silvana Bernasconi、Patrizia Di Gennaro
DOI:10.1016/j.tetasy.2006.01.009
日期:2006.2
Several enantiopure 1,2-amino alcohols have been prepared by combining a stereoselective enzymatic epoxidation of styrenes with regio- and stereoselective chemical reactions. An interesting reactivity has been noted concerning the reaction of epoxides and NH3 under microwave activation.
Mineralocorticoid receptor antagonists (MRa), pharmaceutical compositions containing such inhibitors and the use of such inhibitors to treat, for example, diabetic nephropathy and hypertension in mammals, including humans.
Bioinspired Polyene Cyclization Promoted by Intermolecular Chiral Acetal-SnCl<sub>4</sub> or Chiral <i>N</i>-Acetal-TiCl<sub>4</sub>: Investigation of the Mechanism and Identification of the Key Intermediates
作者:Yu-Jun Zhao、Teck-Peng Loh
DOI:10.1021/ja802896n
日期:2008.7.1
New strategies using chiralacetal or chiral mixed-acetal in the presence of Lewis acids (SnCl4 or TiCl4) to promote polyene cyclization reaction are described. Acetal-promoted and mixed-acetal-promoted polyene cyclization products are very versatile and can easily be converted into various optically active tricyclic and tetracyclic terpenoids. One of the derivatives of the cyclization products was