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Bioorg Med Chem Lett. 2013 Apr 1;23(7):1961-6. doi: 10.1016/j.bmcl.2013.02.039. Epub 2013 Feb 15.

PF-04859989 as a template for structure-based drug design: identification of new pyrazole series of irreversible KAT II inhibitors with improved lipophilic efficiency.

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Pfizer Worldwide Research and Development, Neuroscience Medicinal Chemistry, Groton Laboratories, Eastern Point Road, Groton, CT 06340, USA.


The structure-based design, synthesis, and biological evaluation of a new pyrazole series of irreversible KAT II inhibitors are described herein. The modification of the inhibitor scaffold of 1 and 2 from a dihydroquinolinone core to a tetrahydropyrazolopyridinone core led to discovery of a new series of potent KAT II inhibitors with excellent physicochemical properties. Compound 20 is the most potent and lipophilically efficient of these new pyrazole analogs, with a k(inact)/K(i) value of 112,000 M(-1)s(-1) and lipophilic efficiency (LipE) of 8.53. The X-ray crystal structure of 20 with KAT II demonstrates key features that contribute to this remarkable potency and binding efficiency.

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