摘要:
Three C-14 oxygenated taxanes, 2alpha,5alpha,10beta,14beta-tetraacetoxytaxa-4(20),11-diene (1), 2alpha,5alpha,10beta-triacetoxy-14beta-(2-methyl-butyryloxy)taxa-4(20),11-diene (2), and yunanaxane (3), major products of callus cultures of Taxus spp., were regio- and stereoselectively hydroxylated at the 7beta position by a fungus, Absidia coerulea IFO 4011. Intriguingly, when 1 was co-administered with beta-cyclodextrin and incubated with the fungus cell cultures, three other compounds 5alpha,9alpha,10beta,13alpha-tetraacetoxytaxa-4(20),11-dien-14beta-ol (7), 5alpha,9alpha,10beta,13alpha-tetraacetoxytaxa-4(20),11-dien-1beta-ol (8) and 5alpha,9alpha,10beta,13alpha-tetraacetoxy-11(15-->1) abeotaxa-4(20), 11-dien-15-ol (9) were obtained. (C) 2003 Elsevier Science Ltd. All rights reserved.