A General Strategy for the Synthesis of Cyclic <i>N</i>-Aryl Hydroxamic Acids via Partial Nitro Group Reduction
作者:Laura A. McAllister、Bruce M. Bechle、Amy B. Dounay、Edelweiss Evrard、Xinmin Gan、Somraj Ghosh、Ji-Young Kim、Vinod D. Parikh、Jamison B. Tuttle、Patrick R. Verhoest
DOI:10.1021/jo200530j
日期:2011.5.6
We describe a generalized approach to stereocontrolled synthesis of substituted cyclichydroxamicacids (3-amino-1-hydroxy-3,4-dihydroquinolinones) by selective reduction of substituted 2-nitrophenylalanine substrates. Compounds in this series have antibacterial properties and have also recently been reported as KAT II inhibitors. The key nitrophenyl alanine intermediates are prepared enantioselectively
Discovery of Brain-Penetrant, Irreversible Kynurenine Aminotransferase II Inhibitors for Schizophrenia
作者:Amy B. Dounay、Marie Anderson、Bruce M. Bechle、Brian M. Campbell、Michelle M. Claffey、Artem Evdokimov、Edelweiss Evrard、Kari R. Fonseca、Xinmin Gan、Somraj Ghosh、Matthew M. Hayward、Weldon Horner、Ji-Young Kim、Laura A. McAllister、Jayvardhan Pandit、Vanessa Paradis、Vinod D. Parikh、Matthew R. Reese、SuoBao Rong、Michelle A. Salafia、Katherine Schuyten、Christine A. Strick、Jamison B. Tuttle、James Valentine、Hong Wang、Laura E. Zawadzke、Patrick R. Verhoest
DOI:10.1021/ml200204m
日期:2012.3.8
Kynurenine aminotransferase (KAT) 11 has been identified as a potential new target for the treatment of cognitive impairment associated with schizophrenia and other psychiatric disorders. Following a high-throughput screen, cyclic hydroxamic acid PF-04859989 was identified as a potent and selective inhibitor of human and rat KAT H. An X-ray crystal structure and C-13 NMR studies of PF-04859989 bound to KAT H have demonstrated that this compound forms a covalent adduct with the enzyme cofactor, pyridoxal phosphate (PLP), in the active site. In vivo pharmacokinetic and efficacy studies in rat show that PF-04859989 is a brain-penetrant, irreversible inhibitor and is capable of reducing brain kynurenic acid by 50% at a dose of 10 mg/kg (sc). Preliminary structure-activity relationship investigations have been completed and have identified the positions on this scaffold best suited to modification for further optimization of this novel series of KAT II inhibitors.