Biotransformation of ent-kaur-16-en-19-oic acid by Absidia blakesleeana and Rhizopus oligosporus
摘要:
Biotransformation of ent-kaur-16-en-19-oic acid was carried out with Absidia blakesleeana and Rhizopus oligosporus. Absidia blakesleeana produced two novel metabolites, ent-(7, 9)-dihydroxy-kaur-16-en-19-oic acid and ent-(1, 7)-dihydroxy-kaur-16-en-19-oic acid, together with three known compounds: ent-7-hydroxy-kaur-16-en-19-oic acid, ent-(7, 11)-dihydroxy-kaur-16-en-19-oic acid and ent-(7, 13)-dihydroxy-kaur-16-en-19-oic acid. The ent-7-hydroxy-kaur-16-en-19-oic acid and ent-(7, 9)-dihydroxy-kaur-16-en-19-oic acid were obtained from R. oligosporus. The structures were established by spectroscopic techniques and X-ray crystallography.