Synthesis and characterisation of a ligand that forms a stable tetrahedral intermediate in the active site of the Aureobacterium species (–)γ-lactamase
Enantioselective Propargylation of Polyols and Desymmetrization of <i>meso</i>
1,2-Diols by Copper/Borinic Acid Dual Catalysis
作者:Ren-Zhe Li、Hua Tang、Ke R. Yang、Li-Qiang Wan、Xia Zhang、Jie Liu、Zhengyan Fu、Dawen Niu
DOI:10.1002/anie.201703029
日期:2017.6.12
A copper/borinic acid dual catalytic reaction enabled the enantioselective propargylation of aliphatic polyols. Readily available reagents and catalysts were used in this transformation, which displayed good to excellent chemo‐ and stereoselectivity for a broad array of substrates. The method was also applicable to the desymmetrization of meso 1,2‐diols to furnish products with three stereogenic centers
Scope of the directed dihydroxylation: application to cyclic homoallylic alcohols and trihaloacetamides
作者:Timothy J. Donohoe、Lee Mitchell、Michael J. Waring、Madeleine Helliwell、Andrew Bell、Nicholas J. Newcombe
DOI:10.1039/b303081d
日期:——
The synthesis and directed dihydroxylation of a range of cyclic alkenes was investigated. Both homoallylic alcohols and homoallylic trihaloacetamides were found to be efficient directing groups, giving rise to good to excellent levels of remote asymmetric induction with OsO4–TMEDA. Interestingly, in all cases examined, trifluoroacetamides were found to be superior to trichloroacetamides as directing groups and an argument is presented which rationalises this observation.
Total Synthesis of (±)‐Phyllantidine: Development and Mechanistic Evaluation of a Ring Expansion for Installation of Embedded Nitrogen‐Oxygen Bonds
作者:Kyle M. Lambert、Joshua B. Cox、Lin Liu、Amy C. Jackson、Sam Yruegas、Kenneth B. Wiberg、John L. Wood
DOI:10.1002/anie.202003829
日期:2020.6.8
The development of a concise total synthesis of (±)‐phyllantidine (1 ), a member of the securinega family of alkaloids containing an unusual oxazabicyclo[3.3.1]nonane core, is described. The synthesisemploys a unique synthetic strategy featuring the ring expansion of a substituted cyclopentanone to a cyclic hydroxamic acid as a key step that allows facile installation of the embedded nitrogen‐oxygen
A detailed study of tetrathiomolybdate mediated tandem regio- and stereoselective ring opening of aziridine, disulfide formation, reduction of disulfide bond and Michael reaction in a one-pot operation is reported. This constitutes four reactions that take place in one-pot operation. In the reaction of [BnEt3N]4MoS4 with an aziridine derived from cyclohexene and in the absence of Michael acceptor intermediates
一锅操作中,详细报道了四硫代钼酸盐介导的氮丙啶串联区域和立体选择性开环,二硫键形成,二硫键还原和迈克尔反应的详细研究。这构成了一锅操作中发生的四个反应。在[BnEt 3 N] 4 MoS 4的反应中在不存在迈克尔受体的情况下,用衍生自环己烯的氮丙啶的化合物分离并充分表征了磺酰胺基二硫化物和磺酰胺基硫醇。还已经表明,可以在环氧化物存在下选择性地打开氮丙啶环。通过掺入合适的迈克尔受体作为底物的一部分,可以进行分子内的1,4-加成,以高收率合成含硫的无环环状氨基酸酯衍生物和硫代双环[3.3.1]壬烷衍生物。 。
A facile synthesis of vicinal cis-diols from olefins catalyzed by in situ generated Mn<sub>x</sub>O<sub>y</sub> nanoaggregates
作者:Diğdem Dalmizrak、Haydar Göksu、Mehmet Serdar Gültekin
DOI:10.1039/c5ra01646k
日期:——
The MnxOy oxide derivatives, mainly Mn3O4 nanoaggregates, were generated in situ by KMnO4/H2O2 during the synthesis of vicinal cis-diols from olefins.