C-alkylated spiro[benzofuran-3(2H),4'-1'-methyl-piperidine-7-ols] as potent opioids: A conformation-activity study

Ya Ching Tsai, Jing Ping Liou, Richard Liao, Chen Yu Cheng, Pao Luh Tao

Research output: Contribution to journalArticle

7 Citations (Scopus)


Among a series of C-alkylated analogs of the weak μ opioid ligand spiro[benzofuran-3(2H),4'-1'-methylpiperidine-7-ol] (1), the 2-methyl, 2- ethyl, and cis 3'-methyl analogs, namely compounds (±)2, (±)-3, and (±)- 4, showed much enhanced μ-affinities, with (±)-4 being almost as potent as (-)-morphine; while the trans 3'-methyl analog (±)-5 remained a weak μ- binder. Energy calculations and nmr data indicated that compounds 2-4 favor phenyl-axial conformations, while compounds 1 and 5 favor phenyl-equatorial conformations.

Original languageEnglish
Pages (from-to)1813-1818
Number of pages6
JournalBioorganic and Medicinal Chemistry Letters
Issue number14
Publication statusPublished - Jul 21 1998
Externally publishedYes


ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Organic Chemistry
  • Drug Discovery
  • Pharmaceutical Science

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