title: Design, synthesis, and antipicornavirus activity of 1-[5-(4-arylphenoxy)alkyl]-3-pyridin-4-ylimidazolidin-2-one derivatives.
abstract: A series of pyridylimidazolidinone derivatives was synthesized and tested in vitro against enterovirus 71 (EV71). On the basis of compound 33 (DBPR103), introduction of a methyl group at the 2- or 3-position of the linker between the imidazolidinone and the biphenyl resulted in markedly improved antiviral activity toward EV71 with IC(50) values of 5.0 nM (24b) and 9.3 nM (14a), respectively. Increasing the branched chain to propyl resulted in a progressive decrease in activity, while inserting different heteroatoms entirely rendered the compound only weakly active. The introduction of a bulky group (cyclohexyl, phenyl, or benzyl) led to loss of activity against EV71. The 4-chlorophenyl moiety in 14a was replaced with bioisosteric groups such as oxadiazole (28a-d) or tetrazole (32a,b), dramatically improving anti-EV71 activity and selectivity indices. Compounds 14a, 24b, 28b, 28d, and 32a exhibited a strong activity against lethal EV71, and no apparent cellular toxicity was observed. Three of the more potent imidazolidinone compounds, 14a, 28b, and 32b, were subjected to a large group of picornaviruses to determine their spectrum of antiviral activity.
authors.affiliation: Division of Biotechnology and Pharmaceutical Research, National Health Research Institutes, 35 Keyan Road, Zhunan Town, Miaoli County 350, Taiwan, R.O.C.
authors.forename: Chih-Shiang
authors.initials: CS
authors.lastname: Chang
authors.forename: Ying-Ting
authors.initials: YT
authors.lastname: Lin
authors.forename: Shin-Ru
authors.initials: SR
authors.lastname: Shih
authors.forename: Chung-Chi
authors.initials: CC
authors.lastname: Lee
authors.forename: Yen-Chun
authors.initials: YC
authors.lastname: Lee
authors.forename: Chia-Liang
authors.initials: CL
authors.lastname: Tai
authors.forename: Sung-Nien
authors.initials: SN
authors.lastname: Tseng
authors.forename: Jyh-Haur
authors.initials: JH
authors.lastname: Chern
mesh_terms: D000998:Antiviral Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D002460:Cell Line; D015195:Drug Design; D004770:Enterovirus / Q000187:drug effects* / Q000502:physiology; D006801:Humans; D048289:Imidazolidines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D009500:Neutralization Tests; D011725:Pyridines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D013329:Structure-Activity Relationship; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000998:Antiviral Agents; D048289:Imidazolidines; D011725:Pyridines