Synthetic Racemate and Enantiomers of Cytosporone E, a Metabolite of an Endophytic Fungus, Show Indistinguishably Weak Antimicrobial Activity
作者:Tomoya OHZEKI、Kenji MORI
DOI:10.1271/bbb.67.2584
日期:2003.1
The racemate and the enantiomers of cytosporone E [3-heptyl-4,5,6-trihydroxyphthalide (1)], a metabolite of the endophytic fungus, CR200 (Cytospora sp.), were synthesized. The key steps were (i) Sharpless asymmetric dihydroxylation of an alkene (8) and (ii) HPLC separation of the enantiomers of tert-butyldimethylsilyl ether (12) on a chiral stationary phase. The racemate and enantiomers of cytosporone E showed only weak antimicrobial activity with no difference among them.
合成了内生真菌CR200(Cytospora sp.)的代谢物细胞霉素E [3-庚基-4,5,6-三羟基邻苯二甲酸内酯(1)] 的外消旋体和其对映体。关键步骤为: (i) 烯烃(8)的Sharpless不对称二羟基化, (ii) 在手性固定相上进行的三丁基二甲基硅醚(12)对映体的高效液相色谱分离。细胞霉素E的外消旋体和对映体仅表现出微弱的抗菌活性,且之间没有差异。