Discovery of novel and potent orally active calcium-sensing receptor antagonists that stimulate pulselike parathyroid hormone secretion: Synthesis and structure-activity relationships of tetrahydropyrazolopyrimidine derivatives
Journal of Medicinal Chemistry, ISSN: 0022-2623, Vol: 54, Issue: 5, Page: 1430-1440
2011
- 13Citations
- 17Captures
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Metrics Details
- Citations13
- Citation Indexes13
- 13
- CrossRef10
- Captures17
- Readers17
- 17
Article Description
As part of our research for novel calcium-sensing receptor (CaSR) antagonists that can function as oral bone anabolic agents, we recently reported the discovery of a tetrahydropyrazolopyrimidine derivative featuring adamantyl group 1b with potent CaSR antagonistic activity. To explore the potential of this calcilytic congener, we introduced the gem-dialkyl benzyl group at the 3-position of the tetrahydropyrazolopyrimidine ring, forming a bioisostere of the adamantyl group by mimicking the adamantyl group's lipophilicity and bulkiness. Optimization directed toward the improvement of solubility and metabolic stability led to the discovery of compound 9e, which stimulated transient PTH secretion when orally administered to normal rats. Further, compound 9e proved to be fully effective in an osteopenic ovariectomized rat model. © 2011 American Chemical Society.
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