Synthesis of (αR,βS)-epoxyketones by asymmetric epoxidation of chalcones with cinchona phase-transfer catalysts
摘要:
An efficient method to synthetically produce optically enriched (alpha R,beta S)-epoxyketones was developed using a quaternary ammonium salt derived from cinchona alkaloid as the chiral phase-transfer catalyst. (alpha R,beta S)-Epoxyketones were prepared in high optical purities (91-99% ee) by the asymmetric epoxidation of 1,3-diarylenones with aqueous sodium hypochlorite in the presence of a hydrocinchonine-derived chiral phase-transfer catalyst bearing a 2,3,4-trifluorobenzyl group. (C) 2010 Elsevier Ltd. All rights reserved.
SAR and molecular mechanism studies of monoamine oxidase inhibition by selected chalcone analogs
作者:Raed Shalaby、Jacobus P. Petzer、Anél Petzer、Usman M. Ashraf、Ealla Atari、Fawaz Alasmari、Sivarajan Kumarasamy、Youssef Sari、Ashraf Khalil
DOI:10.1080/14756366.2019.1593158
日期:2019.1.1
reversible competitive mode of inhibition. Most of the synthesized chalcone analogs showed a better selectivity toward MAO-B. However, introducing of 2,4,6-trimethoxy substituents on ring B shifted the selectivity toward MAO-A. In addition, we investigated the molecular mechanism of MAO-B inhibition by selected chalcone analogs. Our results revealed that these selected chalcone analogs increased dopamine levels
COMPOSITION FOR DIAGNOSIS OF AMYLOID-RELATED DISEASE
申请人:Nakayama Morio
公开号:US20100278733A1
公开(公告)日:2010-11-04
There is provided a composition comprising a compound represented by general formula (I), wherein R
l
represents a 5-iodothiophen-2-yl group or the like, and R
2
represents a 4-dimethylaminophenyl group or the like. This composition is useful for diagnosis of an amyloid-related disease such as Alzheimer's disease because the compound has high binding specificity to amyloid β protein, high permeability through the blood-brain barrier, and a property of being rapidly eliminated from sites other than senile plaques in the brain.
COMPOSITION FOR DIAGNOSING AMYLOID-RELATED DISEASE
申请人:Nagasaki University
公开号:EP2030635A1
公开(公告)日:2009-03-04
There is provided a composition comprising a compound represented by general formula (I), wherein R1 represents a 5-iodothiophen-2-yl group or the like, and R2 represents a 4-dimethylaminophenyl group or the like. This composition is useful for diagnosis of an amyloid-related disease such as Alzheimer's disease because the compound has high binding specificity to amyloid β protein, high permeability through the blood-brain barrier, and a property of being rapidly eliminated from sites other than senile plaques in the brain.
Hybrid α-bromoacryloylamido chalcones. Design, synthesis and biological evaluation
作者:Romeo Romagnoli、Pier Giovanni Baraldi、Maria Dora Carrion、Olga Cruz-Lopez、Carlota Lopez Cara、Jan Balzarini、Ernest Hamel、Alessandro Canella、Enrica Fabbri、Roberto Gambari、Giuseppe Basso、Giampietro Viola
DOI:10.1016/j.bmcl.2009.02.038
日期:2009.4
against five cancer cell lines. Such hybrid derivatives demonstrated significantly increased anti-tumor activity compared with the corresponding amino chalcones. The most promising lead molecules were 1k, 1m and 2j, which had the highest activity toward the five cell lines. Flow cytometry with K562 cells showed that the most active compounds resulted in a large proportion of the cells entering in the apoptotic
A Novel Approach to 1,2-Dihydro-2-Oxo-3-Pyridinecarboxylic Ester via Aromatization Induced by Deamidation
作者:Yuefei Hu、Gang Yu、Shaozhong Wang、Kai Wang、Hongwen Hu
DOI:10.1055/s-2004-822325
日期:——
A novel approach was developed for the preparation of 4,6-disubstituted-1,2-dihydro-2-oxo-3-pyridinecarboxylic ester in moderate to good yields. This route involves a reaction sequence of Michael addition, transformation to ene-lactam, and aromatization, featuring easily available material, variable substituents, and good functional compatibility.