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16 Photooxidation of Prenylflavones Isolated from the Root Bark of Morus alba L.

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  • 16 桑根皮より得られるプレニルフラボン類の光酸化反応について

Abstract

The structures of five new flavone derivatives, morusin, cyclo-morusin, compound A, kuwanone A, and kuwanone B, which had been isolated from the root bark of the cultivated mulberry tree (a kind of Morus alba L.), were shown to be I, II, III, IV, and V, respectively. During the course of the study, we had encountered an unusual photooxidation of morusin (I), When a solution of I in CHCl_3 was exposed to bright sunshine, hydroperoxide (IX) was obtained in very high yield. The structure (IX) of this hydroperoxide was determined from chemical and spectral analysis. The mechanism of this reaction was discussed and the phenoxy radical (XV) was suggested to be the intermediate of this photooxidation.

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Details

  • CRID
    1390282681051498624
  • NII Article ID
    110006677903
  • DOI
    10.24496/tennenyuki.20.0_115
  • ISSN
    24331856
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles

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