A chiral pyrrolidine-pyrazole catalyst for the enantioselective Michael addition of carbonyls to nitroolefins
摘要:
An enantioselective Michael reaction of carbonyl compounds to nitroolefins has been accomplished using a novel chiral pyrrolidine-pyrazole catalyst. This newly prepared catalyst was found to be very effective in providing good yields as well as good diastereo- and enantio-selectivities. The mechanism of the reaction has also been substantiated by mass spectral studies. (C) 2011 Elsevier Ltd. All rights reserved.
Design, Synthesis, and Biological Evaluation of New Inhibitors of the Endocannabinoid Uptake: Comparison with Effects on Fatty Acid Amidohydrolase
作者:María L. López-Rodríguez、Alma Viso、Silvia Ortega-Gutiérrez、Christopher J. Fowler、Gunnar Tiger、Eva de Lago、Javier Fernández-Ruiz、José A. Ramos
DOI:10.1021/jm0210818
日期:2003.4.1
A new series of arachidonic acid derivatives were synthesized and evaluated as inhibitors of the endocannabinoiduptake. Most of them are able to inhibit anandamide uptake with IC(50) values in the low micromolar range (IC(50) = 0.8-24 microM). In general, the compounds had only weak effects upon CB(1), CB(2), and VR(1) receptors (K(i) > 1000-10000 nM). In addition, there was no obvious relationship
Pyrimidine derivatives as IL-8 receptor antagonists
申请人:——
公开号:US20040087601A1
公开(公告)日:2004-05-06
Compounds containing the pyrimidine nucleus and their use to treat diseases and conditions related to inappropriate Interleukin-8 receptor activity are disclosed. The compounds are of the formula I
1
In these compounds, Q is preferably unsubstituted and substituted heterocyclyl; U is usually hydrogen or fluorine; and V is preferably hydrogen, halogen, alkyl, —O—alkyl or —S-alkyl. A representative example is:
2
Catalytic Enantioselective Synthesis of Tertiary Thiols From 5<i>H</i>-Thiazol-4-ones and Nitroolefins: Bifunctional Ureidopeptide-Based Brønsted Base Catalysis
Fully loaded: The ureidopeptide‐basedbifunctionalBrønstedbase 1 efficiently promotes the first direct catalytic Michael reaction of α‐mercapto carboxylate surrogates with nitroolefins involving a fully substituted α‐carbon atom construction.
Asymmetric organocatalytic Michael addition of Meldrum’s acid to nitroalkenes: probing the mechanism of bifunctional thiourea organocatalysts
作者:Ari M.P. Koskinen、Antti O. Kataja
DOI:10.3998/ark.5550190.0011.216
日期:——
The asymmetricMichaeladdition of Meldrum’sacid to nitroalkenes was studied using a novel type of Cinchona alkaloid-based bifunctionalthioureaorganocatalyst. The functionality of the thiourea catalysts was also probed by preparing and testing thiourea-N-methylated analogues of the well-known bis-(3,5-trifluoromethyl)phenyl-substituted catalyst.
A chiral diene ligand with tertiary alkyl amine‐derived secondary amide moiety was immobilized on cross‐linked polystyrene (PS) by radical polymerization, which was combined with Rh to form heterogeneous chiral Rh complexes (PS‐diene Rh−Cl). PS‐diene Rh−Cl catalyzed asymmetric arylation reactions of α,β‐unsaturated carbonyl compounds (ketones, esters, and amides), nitroalkenes, and imines afforded