Oxidation of methylophiopogonanone A on the surface of TLC plate

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Abstract

Methylophiopogonanone A (MOPNA, 1) is a characteristic homoisoflavonoid, having two methyl groups on the A ring, isolated from Ophiopogon Root (enlarged part of the root of Ophiopogon japonicus Ker-Gawler, Liliaceae). Although MOPNA is chemically stable in various organic solvents, such as acetone, chloroform, methanol and dimethyl sulfoxide, it gave a spot of higher polarity in addition to the spot of MOPNA on the surface of TLC plate. The spot was isolated and the structure of the major compound was revealed to be a compound with an oxygen atom at C-6 of the A ring. This oxidation on the surface of TLC plate was observed for synthetic intermediates of MOPNA having two methyl groups on a phloroacetophenone-type ring, suggesting that the methyl groups enhanced susceptibility to air oxidation. The structure of the major oxidation product was similar to those of humulone and sufflomin A. Humulone has two prenyl units and sufflomin A has two C-glucosyl moieties instead of the two methyl groups, respectively. As dialkylated phloroacetophenone derivatives seem susceptible to oxidation, air oxidation might be involved in the formation of these compounds. Graphical abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)504-508
Number of pages5
JournalJournal of Natural Medicines
Volume76
Issue number2
DOIs
Publication statusPublished - 2022 Mar

Keywords

  • Dialkylphloroacetophenone
  • Homoisoflavone
  • Methylophiopogonanone A
  • Ophiopogon japonicus
  • Oxidation

ASJC Scopus subject areas

  • Pharmaceutical Science
  • Drug Discovery
  • Complementary and alternative medicine
  • Organic Chemistry

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