Design and synthesis of calindol derivatives as potent and selective calcium sensing receptor agonists
作者:Lionel Kiefer、Floriane Beaumard、Tatiana Gorojankina、Hélène Faure、Martial Ruat、Robert H. Dodd
DOI:10.1016/j.bmc.2015.12.019
日期:2016.2
We report the first comprehensive structure-activity study of calindol (4, (R)-N-[(1H-indol-2-yl) methyl]1-(1-naphthyl) ethanamine), a positive allosteric modulator, or calcimimetic, of the calcium sensing receptor (CaSR). While replacement of the naphthyl moiety of calindol by other aromatic groups (phenyl, biphenyl) was largely detrimental to calcimimetic activity, incorporation of substituents on the 4, 5 or 7 position of the indole portion of calindol was found to provide either equipotent derivatives compared to calindol (e.g., 4-phenyl, 4-hydroxy, 5-hydroxycalindol 44, 52, 53) or, in the case of 7-nitrocalindol (51), a 6-fold more active calcimimetic displaying an EC50 of 20 nM. Unlike calindol, the more active CaSR calcimimetics were shown not to act as antagonists of the closely related GPRC6A receptor, suggesting a more selective profile for these new analogues. (c) 2015 Elsevier Ltd. All rights reserved.