Microbiologically modified chiral synthon. I. 3,8-Dioxo-4-methoxycarbonyl-9-methyl-.DELTA.4(10)-octalin for formal total syntheses of certain sesquiterpenoids and diterpenoids.
作者:Seiichi INAYAMA、Nobuko SHIMIZU、Tamiko OHKURA、Hiroyuki AKITA、Takeshi OISHI、Yoichi IITAKA
DOI:10.1248/cpb.37.712
日期:——
Microbiological reduction of prochiral 3, 8-dioxo-4-methoxycarbonyl-9-methyl-Δ4(10)-octalin (1ab) with various yeasts was carried out. (+)-(8S)-Hydroxy-4-methoxycarbonyl-(9S)-methyl-3-oxo-Δ4(10)-octalin (2a) was desired as a chiral synthon for the formal total syntheses of certain sesquiterpenoids, e.g. α-costal. This ketol was obtained with high optical purity (>99% ee) when propely selected microorganisms such as Hansenula anomala were used. Another chiral synthon produced in high optical purity, that is, 3, 8-dioxo-4-methoxycarbonyl-(9R)-methyl-Δ4(10)-octalin (1b), was also available for the formal total syntheses of ent-type diterpenoids e.g. zonarol.
利用各种酵母对原手性 3,8-二氧代-4-甲氧羰基-9-甲基-Δ4(10)-辛卡林(1ab)进行了微生物还原。(+)-(8S)-羟基-4-甲氧基羰基-(9S)-甲基-3-氧代-Δ4(10)-辛卡林(2a)是某些倍半萜类化合物(如 α-钙)正式全合成所需的手性合成物。使用汉森藻(Hansenula anomala)等经过严格筛选的微生物,可以获得高光学纯度(>99% ee)的这种酮醇。另一种光学纯度很高的手性合成物,即 3,8-二氧代-4-甲氧基羰基-(9R)-甲基-Δ4(10)-辛烷(1b),也可用于正式全合成雌烯型二萜,如唑那洛。