Abstract
The microbiological transformation of 7α,19-dihydroxy- ent-atis-16-ene by the fungus Gibberella fujikuroi gave 19-hydroxy-7-oxo- ent-atis-16-ene, 13( R),19-dihydroxy-7-oxo- ent-atis-16-ene, 7α,11β,19-trihydroxy- ent-atis-16-ene and 7α,16β,19-trihydroxy- ent-atis-16-ene, while the incubation of 19-hydroxy-7-oxo- ent-atis-16-ene afforded 13( R),19-dihydroxy-7-oxo- ent-atis-16-ene and 16β,17-dihydroxy-7-oxo- ent-atisan-19-al. The biotransformation of 7-oxo- ent-atis-16-en-19-oic acid gave 6β-hydroxy-7-oxo- ent-atis-16-en-19-oic acid, 6β,16β,17-trihydroxy-7-oxo-19- nor- ent-atis-4(18)-ene and 3β,7α-dihydroxy-6-oxo- ent-atis-16-en-19-oic acid.
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