迈克尔加成(MA)是合成化学中研究最深入的化学转化之一。在这里,我们报告的合成和晶体结构的3d / 4f配位簇(CCs)配制为[Zn II 2 Y III 2 L 4(solv)X(Z)Y ]并研究其对MA的催化性能。硝基苯乙烯与巴比妥酸衍生物。每个CC都具有两个临界的硬/软路易斯酸性Zn II中心和两个硬的路易斯酸性Y III中心中心位于缺陷的二分体拓扑中,使两种不同的金属相距约3.3Å。密度泛函理论的计算研究表明,这些四金属CC在溶液中解离生成两个催化活性二聚体,每个二聚体包含一种3d和一种4f协同作用的金属。催化作用的机制已通过NMR,电子顺磁共振和UV-vis得到了证实。本工作首次证明了3d / 4f CC在MA反应中作为高效,高非对映选择性催化剂的成功应用。
2-Pyridyl-1,4-dihydropyridine, Verfahren zu ihrer Herstellung sowie ihre Verwendung als Arzneimittel
申请人:BAYER AG
公开号:EP0001054A2
公开(公告)日:1979-03-21
Die vorliegende Erfindung betrifft neue 2-Pyridyl-1 4-dihydropyridine, mehrere Verfahren zu ihrer Herstellung sowie ihre Verwendung als Arzneimittel, vorzugswelse als gefäßesinflussende Mittel. insbosondore @ Coronarmittel.
A simple and practical synthetic strategy for the synthesis of a novel silica-supported organocatalyst system based on L-proline (SSLP) has been developed. First, silica was treated with trimethoxy(vinyl)silane to produced a vinyl-silica (VS) substrate. Then, VS was oxidized using H2O2 to generate the silica-oxiran (SO) material. Finally, ring-opening of oxiranes in SO substrate with L-proline was resulted the production of SSLP catalyst. The catalytic performance of SSLP was evaluated in the three-component synthesis of spirooxindole derivatives via the condensation reaction of isatins and dicarbonyl compounds in water. All reactions were completed in short times and all products were obtained in good to excellent yields. Besides, SSLP could be recovered for 8 times without any additional treatments. (C) 2013 Elsevier B.V. All rights reserved.
Enamino Carbodithioates. I. Methyl 6-Aminouracil-5-carbodithioates. (1). Synthesis and Reactions