Design of N-Benzoxaborole Benzofuran GSK8175-Optimization of Human Pharmacokinetics Inspired by Metabolites of a Failed Clinical HCV Inhibitor.

Abstract:

:We previously described the discovery of GSK5852 (1), a non-nucleoside polymerase (NS5B) inhibitor of hepatitis C virus (HCV), in which an N-benzyl boronic acid was essential for potent antiviral activity. Unfortunately, facile benzylic oxidation resulted in a short plasma half-life (5 h) in human volunteers, and a backup program was initiated to remove metabolic liabilities associated with 1. Herein, we describe second-generation NS5B inhibitors including GSK8175 (49), a sulfonamide- N-benzoxaborole analog with low in vivo clearance across preclinical species and broad-spectrum activity against HCV replicons. An X-ray structure of NS5B protein cocrystallized with 49 revealed unique protein-inhibitor interactions mediated by an extensive network of ordered water molecules and the first evidence of boronate complex formation within the binding pocket. In clinical studies, 49 displayed a 60-63 h half-life and a robust decrease in viral RNA levels in HCV-infected patients, thereby validating our hypothesis that reducing benzylic oxidation would improve human pharmacokinetics and lower efficacious doses relative to 1.

journal_name

J Med Chem

authors

Chong PY,Shotwell JB,Miller J,Price DJ,Maynard A,Voitenleitner C,Mathis A,Williams S,Pouliot JJ,Creech K,Wang F,Fang J,Zhang H,Tai VW,Turner E,Kahler KM,Crosby R,Peat AJ

doi

10.1021/acs.jmedchem.8b01719

subject

Has Abstract

pub_date

2019-04-11 00:00:00

pages

3254-3267

issue

7

eissn

0022-2623

issn

1520-4804

journal_volume

62

pub_type

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