Stereoselectivity in microbiological transformation of stereoisomers of .ALPHA.- cyperone and dihydro-.ALPHA.-cyperone with Colletotrichum phomoides.
作者:HIROSHI HIKINO、CHOHACHI KONNO、YAYOI IKEDA、NOBUKO IZUMI、TSUNEMATSU TAKEMOTO
DOI:10.1248/cpb.23.1231
日期:——
Incubation of three stereoisomers of α-cyperone (1, 2, and 3) with Colletotrichum phomoides resulted in two types of modification hydroxylation (C-2 and C-6) in one isomer (2) and dehydrogenation (C-6 : C-7) in another isomer (3) at the nuclei and in three types of modification (hydration to an alcohol, allylic hydroxylation to an allyl alcohol, and oxidation to a 1, 2-glycol) at the side chains in all the isomers in different rates. On fermentation with the same microbe of three stereoisomers of dihydro-α-cyperone (16, 17, and 18), prepared for prevention of the side chain modification, hydroxylation at the nucleus (C-1) occurred merely in one isomer (16), and the same types of oxidation at the side chains also took place in all the isomers as in their congeners (1-3). The stereoselectivity and the probable mechanisms of the transformations are discussed.
将三种立体异构体α-赛普酮(1、2和3)与Colletotrichum phomoides共培养后,在其中一种异构体(2)中发生了两种类型的修改羟基化(C-2和C-6),而在另一种异构体(3)中发生了去氢反应(C-6 : C-7),在所有异构体的侧链中以不同速率发生了三种类型的修改(转化为醇、烯丙羟基化为烯丙醇,以及氧化为1, 2-甘醇)。在与同一微生物共同发酵三种双氢α-赛普酮的立体异构体(16、17和18)时,为了防止侧链修改,羟基化仅在一种异构体(16)的核部位(C-1)发生,而在所有异构体的侧链中也发生了与其同源物(1-3)相同类型的氧化反应。讨论了转化的立体选择性和可能的机制。