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Bioorg Med Chem Lett. 2013 Oct 1;23(19):5410-4. doi: 10.1016/j.bmcl.2013.07.044. Epub 2013 Jul 30.

Identification of potent, selective, CNS-targeted inverse agonists of the ghrelin receptor.

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Departments of Medicinal Chemistry, Discovery Biology, Drug Metabolism and Pharmaceutical Sciences, Pfizer Worldwide Research and Development, Groton, CT 06340, United States.


The optimization for selectivity and central receptor occupancy for a series of spirocyclic azetidine-piperidine inverse agonists of the ghrelin receptor is described. Decreased mAChR muscarinic M2 binding was achieved by use of a chiral indane in place of a substituted benzylic group. Compounds with desirable balance of human in vitro clearance and ex vivo central receptor occupancy were discovered by incorporation of heterocycles. Specifically, heteroaryl rings with nitrogen(s) vicinal to the indane linkage provided the most attractive overall properties.


Antagonist; Ghrelin; Inverse agonist; Muscarinic; Receptor; Receptor occupancy

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