Kato Hikaru, Nakahara Takashi, Sugimoto Kayo, Matsuo Kanae, Kagiyama Ippei, Frisvad Jens C, Sherman David H, Williams Robert M, Tsukamoto Sachiko
Graduate School of Pharmaceutical Sciences, Kumamoto University , 5-1 Oe-honmachi, Kumamoto 862-0973, Japan.
Org Lett. 2015 Feb 6;17(3):700-3. doi: 10.1021/ol5037198. Epub 2015 Jan 23.
Notoamide S has been hypothesized to be a key biosynthetic intermediate for characteristic metabolites stephacidin A, notoamide B, and versicolamide B in Aspergillus sp. but has not yet been isolated. The isolation of notoamide S and an enantiomeric mixture of 6-epi-stephacidin A enriched with the (-)-isomer from Aspergillus amoenus is reported. The presence of (+)-versicolamide B suggests that the fungus possesses only the oxidase, which converts (+)-6-epi-stephacidin A into (+)-Versicolamide B, but not for (-)-6-epi-Stephacidin A.
有人推测,Notoamide S是曲霉属中特征性代谢产物stephacidin A、Notoamide B和versicolamide B关键的生物合成中间体,但尚未分离得到。本文报道了从美好曲霉中分离出Notoamide S以及富含(-)-异构体的6-表-stephacidin A对映体混合物。(+)-versicolamide B的存在表明,该真菌仅拥有将(+)-6-表-stephacidin A转化为(+)-Versicolamide B的氧化酶,而对(-)-6-表-Stephacidin A则无此作用。