Pheromone synthesis. Part 243: Synthesis and biological evaluation of (3R,13R,1′S)-1′-ethyl-2′-methylpropyl 3,13-dimethylpentadecanoate, the major component of the sex pheromone of Paulownia bagworm, Clania variegata, and its stereoisomers
作者:Kenji Mori、Takuya Tashiro、Boguang Zhao、David M. Suckling、Ashraf M. El-Sayed
DOI:10.1016/j.tet.2010.02.028
日期:2010.4
All of the fourstereoisomers of (1′S)-1′-ethyl-2′-methylpropyl 3,13-dimethylpentadecanoate, the majorcomponent of the female sexpheromone of Clania variegata, were synthesized by employing olefin cross metathesis as the key reaction and starting from (R)- or (S)-2-methyl-1-butanol, (R)- or (S)-citronellal, and (S)-2-methyl-3-pentanol. Their bioassay revealed the (3R,13R,1′S)-isomer as the bioactive
作者:Florian Kleinbeck、Gabriela J. Fettes、Lee D. Fader、Erick M. Carreira
DOI:10.1002/chem.201102797
日期:2012.3.19
A convergent synthesis of bafilomycin A1, a potent inhibitor of V‐type ATPases, is presented. The synthesis relies on the zinc triflate mediated diastereoselective addition of a complex enyne to a sensitive aldehyde as the key fragment coupling. A ruthenium‐catalyzed trans‐reduction of the resulting propargylic enyne efficiently installs the required C10–C13 trans,trans‐diene subunit, implementing
介绍了bafilomycin A 1的收敛合成,bafilomycin A 1是V型ATP酶的有效抑制剂。合成依赖于三氟甲磺酸锌介导的复杂烯炔向非对映体的非对映选择性加成,作为关键片段偶联的敏感醛。钌催化的炔丙基炔的反还原可有效地安装所需的C10–C13反式,反式二烯亚单元,从而实现了传统钯催化交叉偶联策略的替代策略。三元醇中仲羟基的高度选择性氧化为合成完成奠定了基础。
Leaving group dependent stereochemistry of thiollene formation with phenylthiocopper phosphine complexes
作者:Alexander J. Bridges、Robert J. Ross
DOI:10.1016/s0040-4039(00)94010-3
日期:1983.1
A Chiral secondary propargylic triflate (5) reacts with phenylthiocopper phosphine complexes (1) and (2) to give propargyl and allenic sulphides with complete inversion of configuration, but the corresponding mesylate (4) reacts with both complexes to give racemic products.
Ester Synthesis in Water: <i>Mycobacterium smegmatis</i>
Acyl Transferase for Kinetic Resolutions
作者:Nicolas de Leeuw、Guzman Torrelo、Carolin Bisterfeld、Verena Resch、Luuk Mestrom、Emanuele Straulino、Laura van der Weel、Ulf Hanefeld
DOI:10.1002/adsc.201701282
日期:2018.1.17
The acyl transferase from Mycobacterium smegmatis (MsAcT) catalyses transesterification reactions in aqueous media because of itshydrophobic active site. Aliphatic cyanohydrin and alkyne esters can be synthesised in water with excellent and strikingly opposite enantioselectivity [(R);E>37 and (S);E>100, respectively]. When using this enzyme, the undesired hydrolysis of the acyl donor is an important
Rearrangements and Stereomutations of Metallacycles Derived from Allenes and Imidozirconium Complexes
作者:Forrest E. Michael、Andrew P. Duncan、Zachary K. Sweeney、Robert G. Bergman
DOI:10.1021/ja045607k
日期:2005.2.1
azametallacyclobutenes generated via [2+2] cycloaddition of allenes and imidozirconium complexes have been studied. Metallacycles derivedfromallenes bearing beta-hydrogen atoms racemize at room temperature by reversible beta-hydride elimination, a process which is also responsible for their eventual conversion to monoazadiene complexes. Metallacycles derivedfrom diarylallenes racemize by reversible thermal bond