Chemical transformations of the diterpene lactones momilactones A and B

Authors:
  • TKTadahiro Kato
    Tadahiro Kato
  • HAHiroyasu Aizawa
    Hiroyasu Aizawa
  • MTMitsuaki Tsunakawa
    Mitsuaki Tsunakawa
  • NSNobuki Sasaki
    Nobuki Sasaki
  • YKYoshio Kitahara
    Yoshio Kitahara
  • NTNorindo Takahashi
    Norindo Takahashi
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Abstract
In order to confirm the structures of momilactones A (3-oxo-9β-pirnara-7,15-dien-19,6p-olide)(I) and B (3,20-epoxy-3α-hydroxy-9β-pimara-7,15-dien-19,6β-olide)(XIII), growth-inhibitors isolated from husk of rice, their chemical and physical properties were studied in detail. Momilactone B gives a rearrangement product (XVII) on treatment with alkali, whereas momilactone A affords a decarboxylation product (X).