Cooperative Acid-Base Effects with Functionalized Mesoporous Silica Nanoparticles: Applications in Carbon-Carbon Bond-Formation Reactions
作者:Sankaranarayanapillai Shylesh、Alex Wagner、Andreas Seifert、Stefan Ernst、Werner R. Thiel
DOI:10.1002/chem.200900851
日期:2009.7.20
adsorption–desorption analyses, and SEM imaging. The catalytic activities of the mono‐ and bifunctionalmesoporous hybrid materials were evaluated in carbon–carbon coupling reactions like the nitroaldol reaction and the one‐pot deacetalization–nitroaldol and deacetalization–aldol reactions. Among all the catalysts evaluated, the bifunctional sample containing amine and sulfonic acid groups (MSN–NNH2–SO3H) showed excellent
Stereoselective Synthesis of Tetrahydroquinolines via Asymmetric Domino Reaction Catalyzed by a Recyclable Ionic-Liquid-Supported Bifunctional Tertiary Amine
作者:Rinat S. Tukhvatshin、Alexander S. Kucherenko、Yulia V. Nelyubina、Sergei G. Zlotin
DOI:10.1002/ejoc.201801423
日期:2018.12.31
Asymmetric aza‐Michael/Michael domino reaction of N‐Ts or N‐Nos ortho‐aminochalcones with nitroolefins has been performed in the presence of highly recyclable (19 cycles) IL‐supported tertiary amine–squaramide organocatalyst to afford trisubstituted tetrahydro‐quinolines as single diastereomers with up to 99 % ee. N‐Nosylated products were converted to fused pirrolidino‐tetrahydroquinolines.
SELECTIVE AND EFFICIENT BIFUNCTIONAL AND TRIFUNCTIONAL NANOPOROUS CATALYSTS
申请人:Asefa Tewodros
公开号:US20090043134A1
公开(公告)日:2009-02-12
Selective and efficient multifunctional nanoporous catalysts containing spatially distributed organoamine and silanol groups, and methods of preparation thereof. The catalysts have been observed to be very highly efficient in catalysis of the Henry reaction.
Stereodivergent Michael addition of diphenylphosphite to α-nitroalkenes in the presence of squaramide-derived tertiary amines: an enantioselective organocatalytic reaction in supercritical carbon dioxide
作者:Ilya V. Kuchurov、Albert G. Nigmatov、Evgeniya V. Kryuchkova、Alexey A. Kostenko、Alexandr S. Kucherenko、Sergei G. Zlotin
DOI:10.1039/c3gc41647j
日期:——
The first “green” asymmetric organocatalytic reaction in a supercritical carbon dioxide medium was elaborated. Under the proposed conditions (100 bar, 35 °C), α-nitroalkenes enantioselectively accept diphenylphosphite in the presence of bifunctional organocatalysts bearing the tertiary amino group and the squaramide fragment to afford corresponding β-nitrophosphonates in high yields and with enantioselectivities
2-Arylthiomorpholine derivatives as potent and selective monoamine oxidase B inhibitors
作者:Susan Lühr、Marcelo Vilches-Herrera、Angélica Fierro、Rona R. Ramsay、Dale E. Edmondson、Miguel Reyes-Parada、Bruce K. Cassels、Patricio Iturriaga-Vásquez
DOI:10.1016/j.bmc.2010.01.029
日期:2010.2
2-Arylthiomorpholine and 2-arylthiomorpholin-5-one derivatives, designed as rigid and/or non-basic phenylethylamine analogues, were evaluated as rat and human monoamine oxidase inhibitors. Molecular docking provided insight into the binding mode of these inhibitors and rationalized their different potencies. Making the phenylethylamine scaffold rigid by. xing the amine chain in an extended six-membered ring conformation increased MAO-B (but not MAO-A) inhibitory activity relative to the more flexible alpha-methylated derivative. The presence of a basic nitrogen atom is not a prerequisite in either MAO-A or MAO-B. The best K-i values were in the 10(8) M range, with selectivities towards human MAO-B exceeding 2000-fold. (C) 2010 Elsevier Ltd. All rights reserved.