Microbial transformation of (+)- and (-)-2'-demethoxydehydrogriseofulvin by Streptomyces cinereocrocatus.
作者:TAIKO ODA、YOSHIHIRO SATO
DOI:10.1248/cpb.31.934
日期:——
To elucidate the microbial activities of Streptomyces cinereocrocatus, (+)- and (-)-2'-demethoxydehydrogriseofulvin (1c and 3c) were synthesized and subjected to microbial transformation. The microbial transformation of the (-)-enantiomer (3c) afforded (+)-2'-demethoxy-2', 3'-dihydrodehydrogriseofulvin (18) as the sole product in a high yield (60%). On the other hand, the microbial transformation of the (+)-enantiomer (1c) gave (+)-2'-demethoxygriseofulvin (6) (12%) and a mixture of (-)-and (+)-2'-demethoxy-2', 3'-dihydrodehydrogriseofulvin (14 and 18) (8%). The results indicate that the microbial transformations take place directly and/or after isomerization with hydrogenations, depending on the kinds of substrates concerned, i.e., (+)- and (-)-2'-demethoxydehydrogriseofulvin analogs. It was concluded that the modes of microbial transformation of dehydrogriseofulvin analogs are greatly influenced by the structure of the substrates, i.e. the substituent at the 2'-position and/or the enantiomeric nature.
为阐明灰色链霉菌(Streptomyces cinereocrocatus)的微生物活性,合成了(+)-和(-)-2'-去甲氧基脱灰索菌素(1c和3c),并进行了微生物转化。(-)-对映体(3c)的微生物转化产生了(+)-2'-去甲氧基-2', 3'-二氢脱灰索菌素(18),作为唯一产物,产率高达60%。另一方面,(+)-对映体(1c)的微生物转化则获得了(+)-2'-去甲氧基灰索菌素(6),产率为12%,以及一混合物,包括(-)-和(+)-2'-去甲氧基-2', 3'-二氢脱灰索菌素(14和18),产率为8%。结果表明,微生物转化直接发生和/或通过氢化后的异构化,取决于相关底物的种类,即(+)-和(-)-2'-去甲氧基脱灰索菌素类似物。可以得出结论,脱灰索菌素类似物的微生物转化模式受到底物结构的重大影响,即取代基在2'-位置的性质和/或对映体的本质。