Discovery of a Rapidly Metabolized, Long-Acting β<sub>2</sub> Adrenergic Receptor Agonist with a Short Onset Time Incorporating a Sulfone Group Suitable for Once-Daily Dosing
作者:Panayiotis A. Procopiou、Victoria J. Barrett、Keith Biggadike、Peter R. Butchers、Andrew Craven、Alison J. Ford、Stephen B. Guntrip、Duncan S. Holmes、Sara C. Hughes、Anne E. Jones、Brian E. Looker、Peter J. Mutch、Mark Ruston、Deborah Needham、Claire E. Smith
DOI:10.1021/jm401532g
日期:2014.1.9
A series of novel, potent, and selective human beta(2) adrenoceptor agonists incorporating a sulfone moiety on the terminal right-hand-side phenyl ring of (R)-salmeterol is presented. Sulfone 10b had salmeterol-like potency and selectivity profile, long duration of action on guinea pig trachea, and longer than salmeterol duration of action in vivo, suitable for once-daily dosing. It had lower than salmeterol oral absorption in rat, lower bioavailability in rat and dog, and a high turnover in human hepatocytes. It was metabolized in human hepatocytes by hydroxylation, oxidation, cleavage, and conjugation; most of the metabolites would be expected to have reduced or no beta(2) activity. The 4-biphenylsulfonic acid was identified as a crystalline, non-hygroscopic salt of 10b, suitable for inhaled delivery. Furthermore, it was free of any genetic toxicity issues and was considered as a backup to vilanterol.