Oxidant-Free Au(I)-Catalyzed Halide Exchange and C<sub>sp2</sub>–O Bond Forming Reactions
作者:Jordi Serra、Christopher J. Whiteoak、Ferran Acuña-Parés、Marc Font、Josep M. Luis、Julio Lloret-Fillol、Xavi Ribas
DOI:10.1021/jacs.5b08756
日期:2015.10.21
character, Au(I)/Au(III) redox properties or a combination of both. As a result of the high oxidation potential of the Au(I)/Au(III) couple, redox catalysis involving Au typically requires the use of a strong external oxidant. This study demonstrates unusual external oxidant-free Au(I)-catalyzedhalide exchange (including fluorination) and Csp2-O bond formation reactions utilizing a model arylhalide macrocyclic
Au 已被证明通过利用其 π 路易斯酸特性、Au(I)/Au(III) 氧化还原特性或两者的组合来介导许多有机转化。由于 Au(I)/Au(III) 对的高氧化电位,涉及 Au 的氧化还原催化通常需要使用强外部氧化剂。该研究展示了不寻常的无外部氧化剂 Au(I) 催化的卤化物交换(包括氟化)和使用模型芳基卤化物大环底物的 Csp2-O 键形成反应。此外,卤化物交换和 Csp2-O 偶联反应性也可以外推到带有单个螯合基团的底物,从而进一步了解反应机制。这项工作提供了无外部氧化剂的 Au(I) 催化碳-杂原子交叉偶联反应的第一个例子。
Graphene-enhanced platinum-catalysed hydrosilylation of amides and chalcones: a sustainable strategy allocated with in situ heterogenization and multitask application of H<sub>2</sub>PtCl<sub>6</sub>
simple hydrosilylation-type reduction could be further used in the 1,4-hydrosilylation of chalcones. The rationally designed and in situ formed Pt@G@Si nanocatalyst is demonstrated to be highly effective in the 1,4-hydrosilylation of α,β-unsaturated enones, allowing for the facile synthesis of a variety of otherwise inaccessible substituted silyl enolates. In addition, with the aid of platinum catalyst
我们描述了在不同的有机转化中综合利用铂催化剂的新可持续战略,其中由简单的氢化硅烷化型还原制备的有机硅/石墨烯负载的铂催化剂可以进一步用于查耳酮的1,4-氢化硅烷化中。事实证明,合理设计和原位形成的Pt @ G @ Si纳米催化剂在α,β-不饱和烯酮的1,4-氢化硅烷化中非常有效,从而可以轻松合成各种本来无法获得的取代的甲硅烷基烯醇酸酯。另外,在这项工作中,还报道了借助铂催化剂残留物和TBAF,将一锅下游迈克尔取代的烯丙基甲硅烷基化物添加到丙烯酸烷基酯中。
Carbacyclin analogs
申请人:PURDUE RESEARCH FOUNDATION
公开号:EP0496548A1
公开(公告)日:1992-07-29
Carbacyclin analogs that exhibit platelet aggregation inhibition activity and other biological activites common to structurally related prostacyclins are provided.
Sulfonylurea derivatives of formula:
wherein:
J is a phenyl group substituted by a heterocyclic methyl or heterocyclic ethyl group, or a benzyl group substituted by a heterocyclic group;
R is H or CH3, and
A is a mono- or bicyclic heterocyclic residue, e.g. pyrimidinyl or triazinyl, and their agriculturally suitable salts, exhibit herbicidal activity. Some also show a plant growth regulant effect. The novel compounds may be formulated for agricultural use in conventional manner. They may be made by a variety of synthetic routes, e.g. by reacting a sulfonamide JSOzNH2 with the methyl or phenyl ester of the appropriate pyrimidine or triazinecarbamic acid.
式中的磺酰脲衍生物:
其中
J 是被杂环甲基或杂环乙基取代的苯基,或被杂环基取代的苄基;
R 是 H 或 CH3,以及
A 是单环或双环杂环残基,如嘧啶基或三嗪基,以及它们在农业上适用的盐类,具有除草活性。有些化合物还具有植物生长调节作用。新型化合物可按常规方法配制成农用制剂。它们可以通过多种合成途径制得,例如,将磺酰胺 JSOzNH2 与适当的嘧啶或三嗪氨基甲酸的甲基或苯基酯反应。
Method of preparing a chlorinated, brominated, radiobrominated, iodinated and/or radioiodinated, aromatic or heteroaromatic compound, as well as a kit for preparing a diagnostic composition on the basis of this compound
申请人:MALLINCKRODT, INC.(a Missouri corporation)
公开号:EP0165630A2
公开(公告)日:1985-12-27
The invention relates to a method of preparing a chlorinated, brominated, radiobrominated, iodinated and/or radio-iodinated aromatic or heteroaromatic compound, in which the (hetero)aromatic nucleus optionally comprises one or more additional substituents, by reacting the corresponding halogenated or diazonium-substituted compound in the presence of a water-soluble acid and of copper ions as a catalyst with a likewise water-soluble chloride, bromide radiobromide, iodide or radio-iodide, in which the reaction is carried out in the presence of one or more reduction agents, which are stable in acid medium, in a quantity exceeding the quantity of catalyst. The invention also relates to a composition suitable for diagnostic examination and to a kit for the preparation thereof. The invention further relates to a method and an equipment for the preparation of said composition.