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Benzodiazepinone Derivatives as CRTH2 Antagonists.
ACS Medicinal Chemistry Letters 2011 July 15
Multiple CRTH2 antagonists are currently evaluated in human clinical trials for asthma and chronic obstructive pulmonary disease (COPD). During our lead optimization for CRTH2 antagonists, an observation of an intramolecular hydrogen bond in ortho-phenylsulfonamido benzophenone derivatives led to the design and synthesis of conformationally constrained benzodiazepinones as potent CRTH2 antagonists. The benzodiazepinones are 2 orders of magnitude more potent than the original flexible bisaryl ethers in our binding assay. Selected benzodiazepinones, such as compound 6, were also potent in the human eosinophil shape change assay. Analysis of the rigid conformations of these benzodiazepinones and ortho-phenylsulfonamido benzophenones provided an explanation for the structure-activity relationship and revealed the possible bound conformations to CRTH2, which may be useful for building a pharmacophore model of CRTH2 antagonists.
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