Abstract
Starting from Fendiline and R-568, we identified a novel series of urea compounds as positive allosteric modulators of the calcium sensing receptor (CaSR), as part of a program to identify novel therapeutics for secondary hyperparathyroidism. Initially identified disubstituted ureas were converted to trisubstituted urea lead 20e, which was further modified to increase in vivo potency. Replacing a carbomethoxy substituent by various bioisosteres led to compound 46 which exhibited potent in vitro and in vivo activity after oral administration.
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