Synthesis and Biological Evaluation of <i>N</i>-Aryl-5-aryloxazol-2-amine Derivatives as 5-Lipoxygenase Inhibitors

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  • Suh Jee Hee
    Pharmacological Research Center, Bio-organic Division, Korea Research Institute of Chemical Technology
  • Yum Eul Kgun
    Department of Chemistry, Chungnam National University
  • Cho Young Sik
    College of Pharmacy, Keimyung University

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  • Synthesis and Biological Evaluation of N-Aryl-5-aryloxazol-2-amine Derivatives as 5-Lipoxygenase Inhibitors

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Abstract

We describe the synthesis and biological evaluation of N-aryl-5-aryloxazol-2-amine derivatives that are able to inhibit 5-lipoxygenase (5-LOX), a key enzyme of leukotriene synthesis, for the treatment of inflammation-related diseases including asthma and rheumatoid arthritis. A novel structural moiety containing oxazole was initially identified from a chemical library using an in vitro enzymatic and cell-based assay, and its synthesized oxazole derivatives were further examined to develop a structure–activity relationship (SAR). SAR analysis demonstrated that a hydroxyl or amino group at the p-position on N-phenyl was essential for the 5-LOX-inhibitory activities of the derivatives, and that other halogen and methyl group-substituted derivatives affected the potency, positively or negatively. As a result, derivatives selected through first-round screening were further optimized using a cell-based assay and an in vivo assay to develop a potent, selective 5-LOX inhibitor. A final hit exhibited an improved efficacy in arachidonic acid-induced ear edema when applied topically but not orally. Moreover, it showed the additional advantage of sustainable antiinflammatory activity over a reference compound, zileuton. Taken together, chemical entities bearing an oxazole scaffold could be promising as therapeutic drugs for the treatment of chronic inflammatory skin disorders.

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