Facile solid-phase synthesis of 2,3-disubstituted 6H-pyrano[2,3-f]benzimidazole-6-ones

Aimin Song, Lucy Wu, Laura Ho, Kit Lam

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We report herein the facile solid-phase synthesis of 2,3-disubstituted 6H-pyrano[2,3-f]benzimidazole-6-ones using 7-fluoro-4-methyl-6-nitro-2-oxo-2H-1-benzopyran-3-carboxylic acid as the scaffold. The fluorine of the resin-bound scaffold was first replaced by a primary amine. Reduction of the nitro group with tin(II) chloride afforded an o-dianilino intermediate that was treated with an aldehyde followed by the addition of 2,3-dichloro-5,6-dicyanoquinone (DDQ). 2,3-Disubstituted 6H-pyrano[2,3-f]benzimidazole-6-ones were obtained in high purity and good yield after cleavage.

Original languageEnglish (US)
Pages (from-to)4393-4399
Number of pages7
Issue number18
StatePublished - May 1 2006


  • Combinatorial chemistry
  • Imidazocoumarins
  • Solid-phase synthesis

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry
  • Drug Discovery


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