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- W2092814888 abstract "Taxuyunnanine C (1) and its analogs (2 and 3), the C-14 oxygenated 4(20), 11-taxadienes from callus cultures of Taxus sp., were regio- and stereo-selectively hydroxylated at the 7β position by a fungus, Abisidia coerulea IFO 4011, and it was interesting that the longer the alkyl chain of the acyloxyl group at C-14 became, the higher the yield of 7β-hydroxylated product was. Besides the three 7β-hydroxylated products (5, 9, 17), other nine new products (7, 11, 12, 14, 15, 16, 18, 20 and 21) and six known products (4, 6, 8, 10, 13 and 19) were obtained. Subsequently, the acetylated derivatives (24 and 27) of 7β-and 9α-hydroxylated products of 1 were regio- and stereo-specifically hydroxylated at the 9α position by Ginkgo cells and 7β position by A. coerulea, respectively. Thus, the two specific oxidations have been combined. These bioconversions would provide not only valuable intermediates for the semi-synthesis of paclitaxel or other bioactive taxoids from 1 and its analogs, but also some useful hints for the biosynthetic pathway of taxoid in the natural Taxus plant." @default.
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- W2092814888 date "2005-06-01" @default.
- W2092814888 modified "2023-10-16" @default.
- W2092814888 title "Combined biotransformations of 4(20),11-taxadienes" @default.
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- W2092814888 doi "https://doi.org/10.1016/j.tet.2005.03.136" @default.
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