Polymer supported synthesis of novel benzoxazole linked benzimidazoles under microwave conditions: In vitro evaluation of VEGFR-3 kinase inhibition activity

Kaushik Chanda, Barnali Maiti, Gorakh S. Yellol, Ming Hsien Chien, Min Liang Kuo, Chung Ming Sun

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15 Citations (Scopus)


An efficient soluble polymer-supported method has been developed for the parallel synthesis of substituted benzimidazole linked benzoxazoles using focused microwave irradiation. The key step involves the amidation of 4-hydroxy-3-nitrobenzoic acid with polymer-immobilized o-phenylenediamine. Application of mild acidic conditions promoted the ring closure to furnish the benzimidazole ring. After hydrogenation of the nitro-group to amine, the resulted polymer conjugates underwent efficient ring closure with various alkyl, aryl and heteroaryl isothiocyanates to generate the polymer-bound benzimidazolyl benzoxazoles. The polymer-bound compounds were finally cleaved from the support to furnish benzimidazole linked benzoxazole derivatives. The efficacy of the resultant angular bis-heterocyclic library was studied against vascular endothelial growth factor receptor (VEGFR-3). The preliminary screening of these novel compounds exhibits moderate to high inhibition (IC 50 = 0.56-1.42 μM). This protocol provides an easy access to novel angular bis-heterocycles which have potential for the discovery of novel leads for targeted cancer therapeutics.

Original languageEnglish
Pages (from-to)1917-1926
Number of pages10
JournalOrganic and Biomolecular Chemistry
Issue number6
Publication statusPublished - Mar 21 2011


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Biochemistry

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