1369768-29-5Relevant articles and documents
Discovery of (1R,2S)-2-{[(2,4-Dimethylpyrimidin-5-yl)oxy]methyl}-2-(3-fluorophenyl)-N-(5-fluoropyridin-2-yl)cyclopropanecarboxamide (E2006): A Potent and Efficacious Oral Orexin Receptor Antagonist
Yoshida, Yu,Naoe, Yoshimitsu,Terauchi, Taro,Ozaki, Fumihiro,Doko, Takashi,Takemura, Ayumi,Tanaka, Toshiaki,Sorimachi, Keiichi,Beuckmann, Carsten T.,Suzuki, Michiyuki,Ueno, Takashi,Ozaki, Shunsuke,Yonaga, Masahiro
, p. 4648 - 4664 (2015/06/30)
The orexin/hypocretin receptors are a family of G protein-coupled receptors and consist of orexin-1 (OX1) and orexin-2 (OX2) receptor subtypes. Orexin receptors are expressed throughout the central nervous system and are involved in the regulation of the sleep/wake cycle. Because modulation of these receptors constitutes a promising target for novel treatments of disorders associated with the control of sleep and wakefulness, such as insomnia, the development of orexin receptor antagonists has emerged as an important focus in drug discovery research. Here, we report the design, synthesis, characterization, and structure-activity relationships (SARs) of novel orexin receptor antagonists. Various modifications made to the core structure of a previously developed compound (-)-5, the lead molecule, resulted in compounds with improved chemical and pharmacological profiles. The investigation afforded a potential therapeutic agent, (1R,2S)-2-{[(2,4-dimethylpyrimidin-5-yl)oxy]methyl}-2-(3-fluorophenyl)-N-(5-fluoropyridin-2-yl)cyclopropanecarboxamide (E2006), an orally active, potent orexin antagonist. The efficacy was demonstrated in mice in an in vivo study by using sleep parameter measurements. (Chemical Equation Presented).
Synthesis and evaluation of novel radioligands for positron emission tomography imaging of the orexin-2 receptor
Oi, Norihito,Suzuki, Michiyuki,Terauchi, Taro,Tokunaga, Masaki,Nakatani, Yosuke,Yamamoto, Noboru,Fukumura, Toshimitsu,Zhang, Ming-Rong,Suhara, Tetsuya,Higuchi, Makoto
, p. 6371 - 6385 (2013/09/23)
Orexin receptors (OXRs) in the brain have been implicated in diverse physiological and neuropsychiatric conditions. Here we describe the design, synthesis, and evaluation of OXR ligands related to (1R,2S)-2-(((2-methyl-4- methoxymethylpyrimidin-5-yl)oxy)methyl)-N-(5-fluoropyridin-2-yl) -2-(3-fluorophenyl)cyclopropanecarboxamide (9a) applicable to positron emission tomography (PET) imaging. Structural features were incorporated to increase binding affinity for OXRs, to enable carbon-11 radiolabeling, and to adjust lipophilicity considered optimal for brain penetration and low nonspecific binding. 9a displayed nanomolar affinity for OXRs, and autoradiography using rat brain sections showed that specific binding of [11C]9a was distributed primarily to neocortical layer VI and hypothalamus, consistent with reported localizations of orexin-2 receptors (OX2Rs). In vivo PET study of [11C]9a demonstrated moderate uptake of radioactivity into rat and monkey brains under deficiency or blockade of P-glycoprotein, and distribution of PET signals in the brain was in agreement with autoradiographic data. Our approach and findings have provided significant information for development of OX2R PET tracers.