Identification of isoafricanol and its terpene cyclase in Streptomyces violaceusniger using CLSA-NMR
作者:Ramona Riclea、Christian A. Citron、Jan Rinkel、Jeroen S. Dickschat
DOI:10.1039/c4cc00177j
日期:——
The recently developed CLSA-NMR technique that is based on feeding experiments with 13C-labelled precursors was applied in the identification of isoafricanol as the main volatile terpene emitted by Streptomyces violaceusniger. The isoafricanol synthase of this organism is presented, together with a recent phylogenetic analysis of bacterial terpene cyclases.
derivatives) than provided by their oligoprenyldiphosphate precursor. This is sometimes the result of an oxidative ring-opening reaction at a terpene-cyclase-derived molecule containing the regular number of Me group equivalents, as observed for picrotoxan sesquiterpenes. In this study a sesquiterpene cyclase from Trichoderma spp. is described that can convert farnesyl diphosphate (FPP) directly via a remarkable
A Short Total Synthesis of (±)-Isoafricanol and Two of its Isomers
作者:Janine Cossy、Samir BouzBouz、C. Mouza
DOI:10.1055/s-1998-1720
日期:1998.6
The syntheses of (±)-isoafricanol and two if its isomers were achieved from 2,5,5-trimethylcyclohex-2-en-1-ol. The key step was a photoreductive radical cyclisation of an unsaturated ketone.
Isoafricanol synthase from Streptomyces malaysiensis
作者:Patrick Rabe、Markiyan Samborskyy、Peter F. Leadlay、Jeroen S. Dickschat
DOI:10.1039/c7ob00234c
日期:——
A terpene cyclases from Streptomyces malaysiensis was characterised as (+)-isoafricanol synthase and its mechanism was investigated using isotopically labelled substrates.
Total synthesis of (.+-.)-africanol and (.+-.)-isoafricanol
作者:Weiming Fan、James B. White
DOI:10.1021/jo00065a018
日期:1993.6
A six-step synthesis of the sesquiterpenes africanol and isoafricanol from 3,5,5-trimethylcyclohex-2-en-1-one is reported. The anionic oxy-Cope rearrangement is used to prepare substituted 5-cyclodecenones functionalized with an allylstannane moiety, which, upon cyclization with the ketone, lead to hydroazulene derivatives. The stereochemistry in the transannular cyclization can be controlled through the choice of reaction conditions both with respect to the ring fusion itself and with respect to a preexisting chiral center. Cyclopropanation of the alkene that is generated following cyclization completes the synthesis of both compounds.