20 モミの化学成分 : 主に生長調節作用物質について

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Recently, we reported the structure of two new diterpenoids, named monilactone-A (M-A) and -B (M-B), which were isolated from the rice husk. Although partical structure around A ring of these terpenoids are quite similar to that of gibberellins (G-A) excepting the absolute configuration, momilactones exhibited the growth inhibition activity, while the later is the promotor of higher plants. It is of interest to find the active portion of momilactones toward the inhibition. For this purpose chemical transformation of momilactones was carried out to obtain the derivatives and the result was shown in fig 2. Of these the strongest activity were observed in acetyl M-B (XII), followed by monool (V) and M-B. Physical evidence of these derivatives are also discussed to establish the structure of momilactones chemically.
1975-10-01