Novel synthesis of flavonoids of Scutellaria baicalensis Georgi |
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Authors: | Huang Wen-Hsin Chien Pei-Yu Yang Ching-Huey Lee An-Rong |
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Institution: | School of Pharmacy, National Defense Medical Center, Taiwan. |
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Abstract: | A concise and efficient total synthesis of the flavonoids baicalein, oroxylin A and wogonin was described. Intramolecular oxidative cyclization followed by demethylation of chalcone 1, readily prepared from trimethoxyphenol, afforded, depending upon the controlled conditions, baicalein or oroxylin A in excellent yields. Demethylation of 1 yielded 3, which, by oxidation with I(2)/dimethyl sulfoxide (DMSO), was readily converted to oroxylin A and wogonin after column chromatography. |
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