Regio- and stereoselective hydrogenation of 2'-demethoxy-2'-methyldehydrogriseofulvin, a symmetrical substrate, to (+)-2'-demethoxy-2'-methylgriseofulvin with a cell-free system of Streptomyces cinereocrocatus.
作者:Taio ODA、Humie HASHIMOTO、Yoshihiro SATO
DOI:10.1248/cpb.38.525
日期:——
Enzymatic hydrogenation of 2'-demethoxy-2'-methyldehydrogriseofulvin (5) with a cell-free system of Streptomycs cinereocrocatus afforded (+)-2'-demethoxy-2'-methylgriseofulvin (6). The structure of 6 was determined on the basis of comparisons of the proton nuclear magnetic resonance spectrum, mass spectrum, and circular dichroism with those of a standard specimen which was synthesized chemically. The results demonstrated that when the 2'-position of (-)-dehydrogriseofulvin was substituted with a methyl group, its hydrogenation with the cell-free system occurred stereoselectively at the 5', 6'-position.
通过无细胞链霉菌(Streptomycs cinereocrocatus)系统对 2'-demethoxy-2'-methyldehydrogriseofulvin (5)进行酶氢化,得到了 (+)-2'-demethoxy-2'-methylgriseofulvin (6)。根据质子核磁共振谱、质谱和圆二色性与化学合成的标准样品的比较,确定了 6 的结构。结果表明,当 (-)-dehydrogriseofulvin 的 2'-位被甲基取代时,它与无细胞体系的氢化反应在 5'、6'-位上立体选择性地发生。