686344-99-0Relevant academic research and scientific papers
Discovery of 1-[9-(4-chlorophenyl)-8-(2-chlorophenyl)-9H-purin-6-yl]-4- ethylamino-piperidine-4-carboxylic Acid Amide Hydrochloride (CP-945,598), a novel, potent, and selective cannabinoid type 1 receptor antagonist
Griffith, David A.,Hadcock, John R.,Black, Shawn C.,Iredale, Philip A.,Carpino, Philip A.,Dasilva-Jardine, Paul,Day, Robert,Dibrino, Joseph,Dow, Robert L.,Landis, Margaret S.,O'Connor, Rebecca E.,Scott, Dennis O.
supporting information; experimental part, p. 234 - 237 (2009/09/25)
We report the structure-activity relationships, design, and synthesis of the novel cannabinoid type 1 (CB1) receptor antagonist 3a (CP-945,598). Compound 3a showed subnanomolar potency at human CB1 receptors in binding (Ki= 0.7 nM) and functional assays (K i = 0.12 nM). In vivo, compound 3a reversed cannabinoid agonist-mediated responses, reduced food intake, and increased energy expenditure and fat oxidation in rodents. The endocannabinoid system (ECS a), and speci?cally the cannabinoid type 1 (CB1) receptor, plays a pivotal role in energy homeostasis.1-3 As such, stimulation of the ECS promotes food intake and energy storage and may be chronically overactive in obese subjects.4-7 In contrast, blockade of the CB 1 receptor decreases food intake and increases energy expenditure, leading to a reduction in body weight.8-11 It was hoped that CB 1 ceptor antagonists might provide effective therapy options for the management of metabolic disorders, such as obesity. Unfortunately, several CB1 receptor inverse agonists/antagonists were recently withdrawn from clinical development including the diarylpyrazole rimonabant12 1 (SR141716A) and the acyclic amide taranabant132 (MK-0364). Herein, we describe the design strategies that led to the identi?cation of a series of purine derivatives as CB1 receptor antagonists, and the optimization of PK properties that resulted in the discovery of the orally active 3a (CP-945,598), a novel, potent, and selective CB1 receptor antagonist, recently evaluated in phase 3 clinical trials for weight management.
