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Synthesis of Flavonoids in Scutellaria spp. II. Synthesis of 2', 6'-Dioxygenated Flavones

Toshiyuki Tanaka, Munekazu Iinuma, Mizuo Mizuno

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Abstract

Five flavones dioxygenated at C-2'and 6'(5, 7, 2', 6'-tetrahydroxy-, 5, 7, 2'-trihydroxy-6'-methoxy-, 5, 2'-dihydroxy-7, 8, 6'-trimethoxy-, 5, 2', 6'-trihydroxy-7, 8-dimethoxy-, and 5, 7, 2'-trihydroxy-8, 6'-dimethoxyflavone) isolated from Scutellaria spp. were synthesized to confirm their structures. Spectroscopic comparisons of the synthetics with the corresponding natural flavones confirmed the respective structures.

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Five flavones dioxygenated at C-2'and 6'(5, 7, 2', 6'-tetrahydroxy-, 5, 7, 2'-trihydroxy-6'-methoxy-, 5, 2'-dihydroxy-7, 8, 6'-trimethoxy-, 5, 2', 6'-trihydroxy-7, 8-dimethoxy-, and 5, 7, 2'-trihydroxy-8, 6'-dimethoxyflavone) isolated from Scutellaria spp. were synthesized to confirm their structures. Spectroscopic comparisons of the synthetics with the corresponding natural flavones confirmed the respective structures.

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Available abstract

Five flavones dioxygenated at C-2'and 6'(5, 7, 2', 6'-tetrahydroxy-, 5, 7, 2'-trihydroxy-6'-methoxy-, 5, 2'-dihydroxy-7, 8, 6'-trimethoxy-, 5, 2', 6'-trihydroxy-7, 8-dimethoxy-, and 5, 7, 2'-trihydroxy-8, 6'-dimethoxyflavone) isolated from Scutellaria spp. were synthesized to confirm their structures. Spectroscopic comparisons of the synthetics with the corresponding natural flavones confirmed the respective structures.

Key concepts: Flavones, Scutellaria, Chemistry, Flavonoid, Stereochemistry, Scutellaria baicalensis, Traditional medicine, Organic chemistry

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