Orally active PDE4 inhibitor with therapeutic potential

Hiroshi Ochiai, Tazumi Ohtani, Akiharu Ishida, Katuya Kishikawa, Susumu Yamamoto, Hiroshi Takeda, Takaaki Obata, Hisao Nakai, Masaaki Toda

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Based on the promising results obtained by the clinical trial of Ariflo, further optimization of the spatial arrangement of the three pharmacophores (the carboxylic acid moiety, nitrile moiety and 3-cyclopentyloxy-4-methoxyphenyl moiety) in the structure of Ariflo 1 was attempted using a bicyclo[3 ̇3 ̇0]octane template with more stereochemical diversity than the cyclohexane template of Ariflo 1. Biological evaluation of the decyanated analogs and further optimization of the cyclopentyloxy moiety of 2a-b were also performed. Among the compounds tested, 2a, 7a-b and 12a were found to be orally active and were estimated to have therapeutic potential based on cross-species and same-species comparisons. The structure-activity relationships (SARs) of these compounds were investigated and pharmacokinetic data for 2a and 7b were also obtained by single-dose studies in rats.

Original languageEnglish
Pages (from-to)555-571
Number of pages17
JournalEuropean Journal of Medicinal Chemistry
Issue number7
Publication statusPublished - 2004 Jul
Externally publishedYes


  • Bicyclo[3 ̇3 ̇0]octane
  • Orally active
  • PDE4 inhibitor
  • Spatial arrangement
  • Three pharmacophores

ASJC Scopus subject areas

  • Pharmacology
  • Drug Discovery
  • Organic Chemistry


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