The microbiological transformation of two ent-16β,17-epoxykaurane derivatives by Gibberella fujikuroi
作者:Braulio M. Fraga、Pedro González、Ricardo Guillermo、James R. Hanson、Melchor G. Hernández、Jacqueline A. Takahashi
DOI:10.1016/s0031-9422(00)90345-5
日期:1994.11
The biotransformation of ent-16 beta,17-epoxy-7 alpha-hydroxykaurane by Gibberella fujikuroi affords ent-7 alpha,11 alpha,16 beta,17-tetrahydroxykaurane and ent-7 alpha,9 alpha,16 beta,17-tetrahydroxykaurane. These results indicated that the presence of the 16 alpha,17-diol group, into which the 16 alpha,17-epoxy is transformed in the medium, inhibits oxidation at C-19 and favours hydroxylation at C-11(beta). Incubation of ent-16 beta,17-epoxykauran-19-oic acid, via the 16 alpha,17-diol, gave the 7-aldehyde of 16 alpha,17-dihydroxy-GA(12).