Synthesis and Structure−Activity Relationships of Cetiedil Analogues as Blockers of the Ca<sup>2+</sup>-Activated K<sup>+</sup> Permeability of Erythrocytes
作者:Craig J. Roxburgh、C. Robin Ganellin、Salah Athmani、Alessandra Bisi、Wilma Quaglia、David C. H. Benton、Mark A. R. Shiner、Misbah Malik-Hall、Dennis G. Haylett、Donald H. Jenkinson
DOI:10.1021/jm001113w
日期:2001.9.1
Cetiedil, [2-cyclohexyl-2-(3-thienyl)ethanoic acid 2-(hexahydro-1H-azepin-1-yl)ethyl ester], which blocks the intermediate calcium-activated potassium ion permeability (IKCa) in red blood cells, was used as a lead for investigating structure-activity relationships with the aim of determining the pharmacophore and of synthesizing agents of greater potency. A series of compounds having structures related to cetiedil was made and tested on rabbit erythrocytes. Channel blocking activity within the series was found to correlate well with octanol-water partition coefficients but not with the specific chemical structure of the acid moiety. However, whereas log P for the compounds spans a range of values over 4 orders of magnitude, potency only increases by 2 orders. This suggests that hydrophobic interactions with an active site on the channel are probably not the main determinants of activity. It seems more likely that increased lipophilicity enhances access to the channel, probably from within the cell membrane. In keeping with this interpretation, cetiedil methoiodide was found to be inactive, Triphenylethanoic was found to be a more effective acid grouping than 2-cyclohexyl-2-(3-thienyl)ethanoic, and its 2-(hexahydro-1H-azepin-l-yl)ethyl ester (11) was approximately 3 times more potent than cetiedil. The 9-benzylfluoren-9-yl carboxylic acid ester (21) was found to be approximately 9 times more active than cetiedil, and replacing -CO2- in 21 by an ethynyl (-C dropC-) linkage (compound 26, UCL 1608) increased potency by some 15-fold over that of cetiedil.
[EN] AFFINITY LABELING LIBRARIES WITH TAGGED LEAVING GROUPS<br/>[FR] BIBLIOTHEQUES DE MARQUAGE D'AFFINITE AVEC GROUPES PARTANTS MARQUES
申请人:——
公开号:WO1998011437A1
公开(公告)日:1998-03-19
[EN] Methods and compositions are provided for identifying compounds having affinity to a target site. The method provides for the affinity group to be a leaving group from a reactive functionality capable of forming a covalent bond to the target site. One can combine the compound comprising the target site with the library, and assay for the resulting composition of the leaving groups. The leaving groups having the highest concentration can be identified as the groups having the binding highest affinity for the target site. The selected compounds may then be used for labeling the target molecule, particularly where the target molecule is naturally found in a complex mixture, such as a physiological fluid, like blood. By affinity labeling in vivo, the lifetime of physiologically active entities can be greatly enhanced by becoming bound to long lived blood components. The covalently bound entity may also serve as an antagonist or agonist of a particular binding protein or as an enzyme inhibitor. [FR] L'invention concerne des procédés et des compositions permettant d'identifier des composés présentant une affinité vis à vis d'un site cible. Selon ledit procédé, le groupe à affinité est un groupe partant provenant d'une fonctionnalité réactive pouvant former une liaison covalente avec le site cible. Il est possible de combiner le composé comprenant le site cible avec la bibliothèque et de procéder à un dosage concernant la composition obtenue des groupes partants. Les groupes partants présentant la concentration la plus élevée peuvent être identifiés comme les groupes ayant la plus haute affinité de liaison vis à vis du site cible. Les composés sélectionnés peuvent ensuite être utilisés pour marquer la molécule cible, en particulier lorsque la molécule cible est trouvée naturellement dans un mélange complexe, tel qu'un liquide physiologique, par exemple le sang. Grâce à un marquage d'affinité in vivo, la durée de vie d'entités physiologiquement actives peut être grandement prolongée par le fait qu'elles se lient à des composants du sang à longue vie. L'entité liée par covalence peut également servir d'antagoniste ou d'agoniste de protéines de liaison particulières ou bien d'inhibiteur enzymatique.