用三甲基甲硅烷基叠氮化物和分子氧作为化学计量氧化剂实现了乙烯基芳烃的可见光加速氧化叠氮化。与基于铱,钌或有机染料的光催化剂相反,发现[Cu(dap)2 ] Cl或[Cu(dap)Cl 2 ]对于这种转化是独特的,这归因于它们与金属,金属或金属的相互作用。底物通过配体交换和反弹机制。有人建议将铜II作为催化活性物质,将其与叠氮化物配位后将进行光加速均质分解,从而形成铜I和叠氮化物自由基。这种激活原则(CU II -X→铜我+ X 。)开启了铜基光催化的新途径。
<i>anti</i>-Markovnikov Hydroamination of Alkenes Catalyzed by a Two-Component Organic Photoredox System: Direct Access to Phenethylamine Derivatives
作者:Tien M. Nguyen、Namita Manohar、David A. Nicewicz
DOI:10.1002/anie.201402443
日期:2014.6.10
Disclosed herein is a general catalytic system for the intermolecular anti‐Markovnikov hydroamination of alkenes. By using an organocatalytic photoredox system, α‐ and β‐substituted styrenes as well as aliphatic alkenes undergo anti‐Markovnikov hydroamination. Heterocyclic amines were also successfully employed as nitrogen nucleophiles, thus providing a direct route to heterocyclic motifs common in
An efficient cobalt-catalyzed Z to E isomerization of β-substituted styrenes using the amido-diphosphine ligand was developed, delivering the (E)-isomers with good functional tolerance and high stereoselectivity. The reaction could be scaled up to gram-scale with a catalyst loading of 0.1 mol %, using a mixture of (Z)- and (E)-alkene as the starting material. Preliminary mechanistic studies indicated
Direct Olefination of Alcohols with Sulfones by Using Heterogeneous Platinum Catalysts
作者:S. M. A. Hakim Siddiki、Abeda Sultana Touchy、Kenichi Kon、Ken-ichi Shimizu
DOI:10.1002/chem.201505109
日期:2016.4.18
catalysts for the direct Julia olefination of alcohols in the presence of sulfones and KOtBu under oxidant‐free conditions. Primary alcohols, including aryl, aliphatic, allyl, and heterocyclic alcohols, underwent olefination with dimethyl sulfone and aryl alkyl sulfones to give terminal and internal olefins, respectively. Secondary alcohols underwent methylenation with dimethyl sulfone. Under 2.5 bar
发现在无氧化剂条件下,在砜和KO t Bu存在的情况下,碳负载的Pt纳米颗粒(Pt / C)是有效的多相催化剂,可直接用于醇的Julia烯化反应。伯醇,包括芳基,脂族,烯丙基和杂环醇,分别与二甲基砜和芳基烷基砜进行烯烃化反应,分别得到末端烯烃和内部烯烃。仲醇与二甲基砜进行亚甲基化。在2.5 bar H 2下,相同的反应体系对于将醇OH基团转化为烷基基团是有效的。末端烯烃化系统的结构和机理研究表明Pt 0Pt金属颗粒上的两个位点是限制醇脱氢速率的原因,而KO t Bu可能会使砜试剂脱质子。Pt / C催化剂在烯化后可重复使用,与以前报道的方法相比,该方法显示出更高的周转数(TON)和更宽的底物范围,这证明了本方法的高催化效率。
Biocatalytic Cleavage of Alkenes with O<sub>2</sub>and<i>Trametes hirsuta</i>G FCC 047
作者:Miguel Lara、Francesco G. Mutti、Silvia M. Glueck、Wolfgang Kroutil
DOI:10.1002/ejoc.200800261
日期:2008.7
Alkenes possessing a C=C double bond adjacent to an aromatic ring were cleaved to yield the corresponding carbonyl compounds by use of molecular oxygen as the sole oxidant and a cell-free extract of the wood-degrading fungus Trametes hirsuta FCC047 as catalyst. The oxygen pressure required was optimized. Special adapted equipment allowed 96 reactions to be performed in parallel under controlled oxygen
AMIDE DERIVATIVE AND PHARMACEUTICAL COMPOSITION CONTAINING THE SAME
申请人:Kato Shiro
公开号:US20100249399A1
公开(公告)日:2010-09-30
Disclosed is a compound having a strong affinity to serotonin-4 receptors, which is useful as an enterokinesis-promoting agent or a digestive tract function-improving agent. Specifically, disclosed is a compound represented by Formula (1) or a pharmaceutically acceptable salt thereof. Also specifically disclosed is a pharmaceutical composition containing a compound represented by Formula (1) or a pharmaceutically acceptable salt thereof. [In Formula (1), Ar represents a group represented by Formula (Ar-1) or Formula (Ar-2).]