Substituted 2-[(4-Aminomethyl)phenoxy]-2-methylpropionic Acid PPAR Agonists. 1. Discovery of a Novel Series of Potent HDLc Raising A
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The peroxisome proliferator activated receptors PPARhars/alpha.gif" BORDER=0>, PPARhars/gamma.gif" BORDER=0 >, and PPARhars/delta.gif" BORDER=0 > are ligand-activated transcriptionfactors that play a key role in lipid homeostasis. The fibrates raise circulating levels of high-density lipoproteincholesterol and lower levels of triglycerides in part through their activity as PPARhars/alpha.gif" BORDER=0> agonists; however, thelow potency and restricted selectivity of the fibrates may limit their efficacy, and it would be desirable todevelop more potent and selective PPARhars/alpha.gif" BORDER=0> agonists. Modification of the selective PPARhars/delta.gif" BORDER=0 > agonist 1(GW501516) so as to incorporate the 2-aryl-2-methylpropionic acid group of the fibrates led to a markedshift in potency and selectivity toward PPARhars/alpha.gif" BORDER=0> agonism. Optimization of the series gave 25a, which showsEC50 = 4 nM on PPARhars/alpha.gif" BORDER=0> and at least 500-fold selectivity versus PPARhars/delta.gif" BORDER=0 > and PPARhars/gamma.gif" BORDER=0 >. Compound 25a(GW590735) has been progressed to clinical trials for the treatment of diseases of lipid imbalance.

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