51226-29-0Relevant academic research and scientific papers
Identification of a degradation intermediate of the momilactone A rice phytoalexin by the rice blast fungus
Imai, Takuya,Ohashi, Yuko,Mitsuhara, Ichiro,Seo, Shigemi,Toshima, Hiroaki,Hasegawa, Morifumi
, p. 414 - 416 (2012)
We have already shown that major rice diterpene phytoalexin, momilactone A, was detoxified by Magnaporthe oryzae. We report here the identification by NMR, MS, and chemical synthesis of 3,6-dioxo-19-nor-9α-pimara-7,15-diene (1) as the degradation intermediate. Compound 1 exhibited similar antifungal activity to that of momilactone A, indicating 1 to be a precursor of possible detoxified compounds.
Chemical transformations of the diterpene lactones momilactones A and B
Kato, Tadahiro,Aizawa, Hiroyasu,Tsunakawa, Mitsuaki,Sasaki, Nobuki,Kitahara, Yoshio,Takahashi, Norindo
, p. 250 - 254 (2007/10/06)
In order to confirm the structures of momilactones A (3-oxo-9β-pimara- 7, 15-dien-19,6β-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).
