Polyphenols and acids of Ulugbekia tschimganica
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From the herbage ofUlugbekia tschimganica (B. Fedtsch.) Zak two new phenolcarboxylic acids have been isolated in the form of their methyl derivatives: methyl ulugbekate C19H18O6 (I) and methyl ulugbinate acid C20H22O7 (II), mp 228°C.
It has been established that (I) most probably has the structure of 1,5-bis(3′,4′-dihydroxyphenyl)-3-methoxycarbonylpent-1-ene and (II) that of 1,5-bis(2′,4′-dihydroxyphenyl)-3-methoxycarbonylpent-1-ene and (II) that of 1,5-bis(2′,4′-dihydroxyphenyl)-3-methoxycarbonyl-4-methoxypent-2-ene.
The presence of fumaric, caffeic, and chlorogenic acids, and also of mono and dimethyl fumarates has been established chromatographically.
The roots have yielded a new phenolic terpenoid, C16H20O4, for which 3-(2,4-dihydroxyphenyl)-1-(5,5-dimethyltetrahydropyran-2-ylidene)propene has been suggested as one of the most likely structures.
KeywordsGossypol Phenolic Hydroxyl Dihydroxyphenyl Dimethyl Fumarate Tertiary Carbon Atom
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