Positive Allosteric Modulators of 2-Amino-3-(3-hydroxy-5-methylisoxazol-4-yl)propionic Acid Receptors Belonging to 4-Cyclopropyl-3,4-dihydro-2H-1,2,4-pyridothiadiazine Dioxides and Diversely Ch

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• 作者：Pierre Francotte ; Ann-Beth N酶rholm ; Taru Deva ; Lars Olsen ; Karla Frydenvang ; Eric Goffin ; Pierre Fraikin ; Pascal de Tullio ; Sylvie Challal ; Jean-Yves Thomas ; Fabrice Iop ; Caroline Louis ; Iuliana Botez-Pop ; Pierre Lestage ; Laurence Danober ; Jette S. Kastrup ; Bernard Pirotte
• 刊名：Journal of Medicinal Chemistry
• 出版年：2014
• 出版时间：November 26, 2014
• 年：2014
• 卷：57
• 期：22
• 页码：9539-9553
• 全文大小：538K
• ISSN：1520-4804

文摘

Two 4-ethyl-substituted pyridothiadiazine dioxides belonging to 伪-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor positive allosteric modulators were cocrystallized with the GluA2 ligand binding domain in order to decipher the impact of the position of the nitrogen atom on their binding mode at the AMPA receptors. The latter was found to be very similar to that of previously described benzothiadiazine-type AMPA receptor modulators. The affinity of the two compounds for the receptor was determined by isothermal titration calorimetry. Accordingly, the synthesis and biological evaluation of novel 4-cyclopropyl-substituted pyridothiadiazine dioxides was performed and completed with the synthesis of the corresponding chloro-substituted 4-cyclopropyl-3,4-dihydro-2H-benzothiadiazine 1,1-dioxides. The 鈥?-aza鈥?compound 32 was found to be the most potent pyridothiadiazine-type AMPA receptor potentiator in vitro, whereas the 7-chloro-substituted compound 36c emerged as the most promising benzothiadiazine dioxide. Due to proper drug-likeness and low in vivo acute toxicity in mice, 36c was chosen for a more complete preclinical evaluation. The compound was able to easily cross the blood鈥揵rain barrier. In an in vivo object recognition test with CD1 mice, oral administration of 36c was found to significantly improve cognition performance at doses as low as 1 mg/kg.