Microbial transformation of (+)- and (-)-dehydrogriseofulvin by Streptomyces species analyzed by 2H nuclear magnetic resonance spectroscopy.
作者:YOSHIHIRO SATO、TAIKO ODA、HAZIME SAITO
DOI:10.1248/cpb.29.2313
日期:——
To elueidate the stereochemical course of the microbial transformation of (+)-dehydrogriseofulvin (DGF) by Streptomyces species, (+)-[5'-2H] DGF, which was obtained by dehydrogenation of (+)-[5'α, 5'β-2H] epigriseofulvin, was incubated with S. cinereo-crocatus. The structure of the product was identified as (+)-[5'α-2H] griseofulvin (GF) by 2H nuclear magnetic resonance spectroscopy. The results of incubations of (-)-and (+)-DGF with eight Streptomyces species (S. cinereocrocatus, S. roseochromogenus, S. bikiniensis, S. griseinus, S. durhamensis, S. californicus, S. fimbriatus, and S. cinereoruber) showed that (-)-and (+)-DGF were isomerized to each other and converted to (+)-GF as the main product, although some (-)-GF was also formed depending on the microorganisms used. In particular, incubation of (+)-DGF with S. cinereoruber yielded (-)-GF as the main product. In addition, (±)-DGF was transformed by S. cinereocrocatus to the naturally occurring (+)-GF in 48% yield. The enantiomer ratios of DGF and GF obtained by microbial transformation were calculated from the [α]D values of corresponding enantiomer mixtures.
为了弄清链霉菌对(+)-脱氢格瑞沙富尔文(DGF)进行微生物转化的立体化学过程,将(+)-[5',5'β-2H] epigriseofulvin 脱氢得到的(+)-[5'α,5'β-2H] DGF 与 S. cinereo-crocatus 培养。通过 2H 核磁共振光谱,确定了产物的结构为 (+)-[5'α-2H] Griseofulvin (GF)。(-)-和(+)-DGF与八种链霉菌(S. cinereocrocatus、S. roseochromogenus、S. bikiniensis、S. griseinus、S. durhamensis、S. californicus、S. fimbriatus 和 S. cinereoruber)的培养结果表明cinereoruber)显示,(-)-和(+)-DGF 相互异构,并转化为 (+)-GF 作为主要产物,但根据所用微生物的不同,也会形成一些 (-)-GF 。特别是,(+)-DGF 与 S. cinereoruber 培养后会产生 (-)-GF 作为主要产物。此外,(±)-DGF 被 S. cinereocrocatus 转化为天然的 (+)-GF 的产率为 48%。根据相应对映体混合物的[α]D 值计算出了通过微生物转化获得的 DGF 和 GF 的对映体比率。