Indole alkaloid sulfonic acids from an aqueous extract of Isatis indigotica roots and their antiviral activity |
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Affiliation: | State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China |
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Abstract: | Six new indole alkaloid sulfonic acids (1–6), together with two analogues (7 and 8) that were previously reported as synthetic products, were isolated from an aqueous extract of the Isatis indigotica root. Their structures including the absolute configurations were determined by spectroscopic data analysis, combined with enzyme hydrolysis and comparison of experimental circular dichroism and calculated electronic circular dichroism spectra. In the preliminary assay, compounds 2 and 4 showed antiviral activity against Coxsackie virus B3 and influenza virus A/Hanfang/359/95 (H3N2), respectively. |
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Keywords: | Cruciferae Indole alkaloid sulfonic acids Isatibis indosulfonic acids Isatindosulfonic acids Antiviral activity |
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