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|Title:||The biotransformation of two ent-15B,16B-epoxy-kaurane derivatives by Gibberella fujikuroi|
|Authors:||Fraga, Braulio M. ; Hernández, Melchor G.; García-Tellado, Fernando ; González, Pedro; Perales, Áurea|
|Citation:||Phytochemistry 34(1): pp. 133-138 (1993)|
|Abstract:||The microbiological transformation of the diterpene ent-15B,16B-epoxy-14a-hydroxykaurane into ent-14a,15B-dihydroxy-11a,16a-epoxykaurane, ent-7a,14a,15B-trihydroxy-11a,16a-epoxykaurane and ent-7B,14a,15B-trihydroxy-11a,16a-epoxykaurane has been carried out using the fungus Gibberella fujikuroi. The incubation with this fungus of sideroxol (ent-7a,18-dihydroxy-15B,16B-epoxykaurane) gave as main products ent-7a,15B,18-trihydroxy-11a,16a-epoxykaurane and ent-7a,13,18-trihydroxy-15a,16a-epoxykaurane. Some of these compounds were identified as their acetate derivatives. The presence of the 15a,16a-epoxy group in these two substrates inhibits transformations involving oxidation at C-19 and favours the hydroxylation at C-11(B).|
|Appears in Collections:||(IPNA) Artículos|
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