Pd(OAc)2-catalyzed orthogonal synthesis of 2-hydroxybenzoates and substituted cyclohexanones from acyclic unsaturated 1,3-carbonyl compounds
作者:Toshinori Miyagi、Sho Okada、Naoya Tada、Masahiro Sugihara、Natsuko Kagawa、Tetsuhiko Takabatake、Masahiro Toyota
DOI:10.1016/j.tetlet.2019.05.041
日期:2019.6
A Pd-catalyzed orthogonal synthesis of substituted 2-hydroxybenzoates and substituted cyclohexanones was developed for the first time. The substituted 2-hydroxybenzoates were obtained fromacyclic unsaturated 1,3-carbonyl compounds using a combination of catalytic Pd(OAc)2 and Cu(OAc)2. On the other hand, the substituted cyclohexanones were produced from similar substrates via catalytic Pd(OAc)2 and
The Biosynthetic Gene Cluster for Sestermobaraenes—Discovery of a Geranylfarnesyl Diphosphate Synthase and a Multiproduct Sesterterpene Synthase from
<i>Streptomyces mobaraensis</i>
作者:Anwei Hou、Jeroen S. Dickschat
DOI:10.1002/anie.202010084
日期:2020.11.2
A biosyntheticgeneclusterfromStreptomycesmobaraensis encoding the first cases of a bacterial geranylfarnesyldiphosphatesynthase and a type I sesterterpenesynthase was identified. The structures of seven sesterterpenes produced by these enzymes were elucidated, including their absolute configurations. The enzyme mechanism of the sesterterpenesynthase was investigated by extensive isotope labeling
鉴定出来自茂原链霉菌的生物合成基因簇,编码第一批细菌香叶基法呢基二磷酸合酶和 I 型二倍萜合酶。阐明了这些酶产生的七种二倍萜的结构,包括它们的绝对构型。通过广泛的同位素标记实验研究了二倍萜合酶的酶机制。
Mechanistic Investigations of Two Bacterial Diterpene Cyclases: Spiroviolene Synthase and Tsukubadiene Synthase
作者:Patrick Rabe、Jan Rinkel、Etilia Dolja、Thomas Schmitz、Britta Nubbemeyer、T. Hoang Luu、Jeroen S. Dickschat
DOI:10.1002/anie.201612439
日期:2017.3.1
two diterpene cyclases from streptomycetes—one with an unknown product that was identified as the spirocyclic hydrocarbon spiroviolene and one with the known product tsukubadiene—were investigated in detail by isotope labeling experiments. Although the structures of the products were very different, the cyclization mechanisms of both enzymes proceed through the same initial cyclizationreactions, before
A Branched Diterpene Cascade: The Mechanism of Spinodiene Synthase from<i>Saccharopolyspora spinosa</i>
作者:Jan Rinkel、Lukas Lauterbach、Jeroen S. Dickschat
DOI:10.1002/anie.201812216
日期:2019.1.8
synthase from Saccharopolyspora spinosa was found to convert geranylgeranyl diphosphate into the new natural products spinodiene A and B, accompanied by 2,7,18‐dolabellatriene. The structures and the formation mechanism of the enzyme products were investigated by extensive isotopic labelling experiments, which revealed an unusual branched isomerisation mechanism towards the neutral intermediate 2,7,18‐dolabellatriene
Evaluation of Isoprenoid Conformation in Solution and in the Active Site of Protein-Farnesyl Transferase Using Carbon-13 Labeling in Conjunction with Solution- and Solid-State NMR
作者:Todd J. Zahn、Markus Eilers、Zhengmao Guo、Mohamad B. Ksebati、Matthew Simon、Jeffrey D. Scholten、Steven O. Smith、Richard A. Gibbs
DOI:10.1021/ja000860f
日期:2000.8.1
knowledge of the solutionconformation of FPP, as well as its conformation in the active site of FTase. Four bis-13C-labeled derivatives of farnesol and geranylgeraniol have been synthesized and used to prepare the corresponding FPP and GGPP derivatives. The labeled farnesyl and geranylgeranyl derivatives 2−7 were utilized in conjunction with solution 13C NMR to probe the conformation of the prenyl chain