96 カスタステロンB環部変換体の合成とそのブラシノステロイド活性

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On the basis of our recent study on B-ring modified brassinosteroids which exhibit considerable Arabidopsis det2 hypocotyl elongation activities in spite of their poor rice lamina joint inclination activities, 6-hydroxy derivatives of castasterone (CS, 1) were prepared and assayed by rescue test of hypocotyl elongation using a brassinosteroid (BR) deficient mutant, Arabidopsis det2. Both 6α- and 6β-hydroxy derivatives exhibit high DHE activities as well as 6α-methoxy derivative. In order to examine whether this activity is the result of some kind of metabolism in plant body as was reported for 6α-hydroxy derivative, or by the nature of the structure of these compounds, further modification on the 6-position of the B-ring of castasterone was applied, and structure-activity relationships were explored.
植物化学調節学会の論文
2002-10-31