Abstract
A modified procedure of a previous synthetic route for baicalein was developed in order to obtain more than ten grams of baicalein forin vivo test. There were several difficulties in applying the published experimental procedures for a large scale of synthesis. The modified synthetic work was successfully accomplished by reducing amount of strong Lewis acid in Fries rearrangement and using tetrabutylammonium iodide as an additive to speed up the demethylation reaction in refluxing HBr into completion.
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Akiyama, T., Shima, H., and Ozaki, S., A concise synthesis of (-)-conduritol F from L-quebrachitolvia AICI3-n-Bu4NI mediated demethylation.Tetrahedron Lett, 32, 5593–5596 (1991).
Allan, J. and Robinson, R., Accessible derivative of chromonol. J. Chem. Soc, 2192–2194 (1924).
Chiba, K, Takakuwa, T., Tada, M., and Yoshii, T., Inhibitory effect of acylphloroglucinol derivatives on the replication of vesicular stomatitis virus.Biosci. Biotechnol. Biochem., 56, 1769–1772(1992).
Ciesielska, E., Wolszczak, M., Gulanowski, B., Szulawska, A., Kochman, A., and Metodiewa, D.,In vitro antileukemic, anti- oxidant and prooxidant activities of Antoksyd S (C/E/XXI): a comparison with baicalin and baicalein.In vivo, 18, 497–503 (2004).
Hanessian, S. and Guindon, Y, Cleavage of methyl and benzyl ethers with thiotrimethylsilanes.Tetrahedron Lett., 21, 2305- 2108(1980).
Huang, W.-H., Chien, P.-Y, Yang, C.-H., and Lee, A.-R., Novel synthesis of flavonoids of scutellaria baicalensis Georgi.Chem. Pharm. Bull., 51, 339–340 (2003).
linuma, M., Iwashima, K., and Matsuura, S., Synthetic studies on flavone derivatives. XIV. Synthesis of 2′,4′,5′-trioxygenated flavones.Chem. Pharm. Bull., 32, 4935–4941 (1984).
Kyo, R., Nakahata, N., Sakakibara, I., Kubo, M., and Ohizumi, Y J., Baicalin and baicalein, constituents of an important medicinal plant, inhibit intracellular Ca2+ elevation by reducing phospholipase C activity in C6 rat glioma cells.Pharm. Pharmacol., 50, 1179–1182 (1998).
Lee, J. I., Son, H. S., and Jung, M. G, A novel synthesis of flavones from 2-methoxybenzoic acids.Bull. Korean Chem. Soc, 26, 1461–1463(2005).
Liu, J.-J., Huang, T.-S., Cheng, W.-F., and Lu, F.-J., Baicalein and baicalin are potent inhibitors of angiogenesis: Inhibition of endothelial cell proliferation, migration and differentiation.Int. J. Cancer, 106, 559–565 (2003).
Mahal, H. S. and Venkataraman, K., Synthesis of flavones at room temperature.Curr. Sci., 4, 214–215 (1933).
Moher, E. D., Collins, J. L, and Grieco, P. A., Synthetic studies on quassinoids: total synthesis of simalikalactone D and assignment of the absolute configuration of the methylbutyrate ester side chain.J. Am. Chem. Soc, 114, 2764–2765 (1992).
Psotova, J., Chlopcikova, S., Miketova, P., Hrbac, J., and Simanek, V., Chemoprotective effect of plant phenolics against anthracycline-induced toxicity on rat cardiomyocytes. Part III. Apigenin, baicalein, kaempferol, luteolin and quercetin.Phytother. Res., 18, 516–521 (2004).
Wang, J., Yu, Y, Hashimoto, F., Sakata, Y, Fujii, M., and Hou, D.-X., Baicalein induces apoptosis through ROS-mediated mitochondrial dysfunction pathway in HL-60 cells.Int. J. Mol. Med., 14, 627–632(2004).
Wheeler, T. S., “Organic Synthesis,” Collective Vol. IV, 2nd ed. by N. Rabojohn, John Wiley & Sons, New York, 478–481 (1967).
Zhao, J., Zhang, Z., Chen, H., Zhang, X., and Chen, X., Synthesis of baicalin derivatives and evaluation of their anti- human immunodeficiency virus (HIV-1) activity.Acta. Pharmaceutica Sinica, 33, 22–27 (1998).
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Kim, S., Sohn, D.W., Kim, Y.C. et al. Fine tuning of a reported synthetic route for biologically active flavonoid, baicalein. Arch Pharm Res 30, 18–21 (2007). https://doi.org/10.1007/BF02977773
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DOI: https://doi.org/10.1007/BF02977773