庚醛 、 β-硝基苯乙烯 在
k-carrageenan functionalized with Fe3O4 magnetic nanoparticles 作用下,
以
neat (no solvent) 为溶剂,
反应 28.0h,
以54%的产率得到(S)-2-((R)-2-nitro-1-phenylethyl)heptanal
参考文献:
名称:
杂化磁性材料(Fe 3 O 4 –κ-角叉菜胶)作为醛向硝基烯烃的迈克尔加成反应的催化剂
摘要:
已经从κ-角叉菜胶和Fe 3 O 4纳米颗粒制备了两种杂化磁性材料,并测试了将醛迈克尔加成到硝基烯烃中的催化剂。值得注意的是,由未修饰的κ-角叉菜胶制备的材料在选择的反应中表现出催化活性,而各个组分没有活性。这指出了MNP与κ-角叉菜胶之间的协同作用。还显示了带有二苯基脯氨醇甲硅烷基醚部分的第二种催化剂促进了反应,从而在优异的ee中产生了相应的加合物。反应完成后,可通过简单的磁倾析法方便地回收催化剂。
Bifunctional 2,5-Diketopiperazines as Efficient Organocatalysts for the Enantioselective Conjugate Addition of Aldehydes to Nitroolefins
作者:Marco Durini、Florian A. Sahr、Michael Kuhn、Monica Civera、Cesare Gennari、Umberto Piarulli
DOI:10.1002/ejoc.201100794
日期:2011.10
synthesized. DKP-1 and DKP-2 are bifunctional diketopiperazines formally derived from the head-to-tail cyclization of L-aspartic acid and either (R)- or (S)-2,3-diaminopropionic acid, which feature aminomethyl and carboxymethyl side arms in the 3- and 6-positions of the 2,5-piperazindione ring. Peptidomimics (3–6) were tested as organocatalysts in the conjugateaddition of several aldehydes to β-nitrostyrene
Asymmetric Michael reaction of aldehydes with β-nitroalkenes catalyzed by pyrrolidine-camphor derived organocatalysts bearing hydrogen-bond donors
作者:Jiang Weng、Hui-Bing Ai、Ren-Shi Luo、Gui Lu
DOI:10.1002/chir.21991
日期:2012.4
derived organocatalysts were designed and synthesized. These organocatalysts were used for direct Michaelreaction of aldehydes with nitroalkenes to give the desired γ‐nitrocarbonyl compounds in high yields (up to 99%), high diastereoselectivities (syn:anti up to 92:8), and good to excellent enantioselectivities (up to 94% ee). Possible transition‐state model was also proposed for this asymmetric transformation
Ionic Liquid-Supported (ILS) (S)-Pyrrolidine Sulfonamide for Asymmetric Michael Addition Reactions of Aldehydes with Nitroolefins
作者:Emmy M. Omar、Kritanjali Dhungana、Allan D. Headley、Mohd Basyaruddin Abdul Rahman
DOI:10.2174/157017811795038395
日期:2011.3.1
supported (ILS) (S)-pyrrolidine sulfonamide organocatalyst (1c), which was developed earlier in our lab, has been applied to a wider range of Michaeladditionreaction, involving various aryl-substituted nitroolefins and a series of aldehydes. Catalyst 1c catalyzes Michaeladditions in which only 2 equivalents of aldehydes to each equivalent of nitroolefin are required. With 10 mol% of ILS catalyst
4,4′-Disubstituted-L-proline Catalyzes the Direct Asymmetric Michael Addition of Aldehydes to Nitrostyrenes
作者:Liu-qun Gu、Gang Zhao
DOI:10.1002/adsc.200600640
日期:2007.7.2
In a search for small organic molecules as catalysts for the directasymmetricMichaeladdition reaction of aldehydes to nitrostyrenes, 4,4′-di(naphthalene-1-ylmethyl)-L-proline 1c and a catalytic amount of 4-dimethylaminopyridine (DMAP) were found to be an efficient system for the Michaeladdition of aldehydes to nitrostyrenes with high diastereo- and enantioselectivity and broad substrate range.
Hybrid magnetic materials (Fe3O4–κ-carrageenan) as catalysts for the Michael addition of aldehydes to nitroalkenes
作者:Carmen A. Mak、Sara Ranjbar、Paola Riente、Carles Rodríguez-Escrich、Miquel A. Pericàs
DOI:10.1016/j.tet.2014.06.063
日期:2014.9
Two hybrid magnetic materials have been prepared from κ-carrageenan and Fe3O4 nanoparticles and tested as catalysts for the Michaeladdition of aldehydes to nitroalkenes. Remarkably, the material prepared from unmodified κ-carrageenan showed catalytic activity in the reaction of choice, while the individual components were inactive. This points out to a synergistic effect between the MNPs and κ-carrageenan
已经从κ-角叉菜胶和Fe 3 O 4纳米颗粒制备了两种杂化磁性材料,并测试了将醛迈克尔加成到硝基烯烃中的催化剂。值得注意的是,由未修饰的κ-角叉菜胶制备的材料在选择的反应中表现出催化活性,而各个组分没有活性。这指出了MNP与κ-角叉菜胶之间的协同作用。还显示了带有二苯基脯氨醇甲硅烷基醚部分的第二种催化剂促进了反应,从而在优异的ee中产生了相应的加合物。反应完成后,可通过简单的磁倾析法方便地回收催化剂。