Design and Evaluation of Hydroxamate Derivatives as Metal-Mediated Inhibitors of a Protein Tyrosine Kinase
摘要:
Protein tyrosine kinases use two Mg2+ ions as cofactors in catalysis, one as the ATP-Mg complex (M1) and the other as an essential activator (M2). The M2-binding site has high affinity for transition metal cations such as cobalt and zinc. Taking advantage of this high affinity, we examined hydroxamates as metal-mediated inhibitors against C-terminal Src kinase (Csk), a protein tyrosine kinase. Of a small group of amino acid hydroxamates, tyrosine and phenylalanine hydroxamates inhibited Csk activity only in the presence of Co2+. Four classes of phenylalanine and tyrosine hydroxamate derivatives were synthesized and evaluated as metal-mediated inhibitors of Csk, leading to improved inhibition and a better understanding of the structure-activity relationships. This study suggests that hydroxamates may serve as a general scaffold for developing metal-mediated inhibitors against protein tyrosine kinases. To the best of our knowledge, this is the first report of designing metal-mediated inhibitors against a protein tyrosine kinase by targeting a metal binding site.
Reaction of rac-alpha-substituted arylacetyl chlorides with (R)- and (S)-3-hydroxy-4,4-dimethyl-1-phenyl-2-pyrrolidinone under standard esterification conditions, gave esters (3R,alpha R)- and (3S,alpha S)-3, respectively, with a diastereoselectivity which diminishes on increasing the steric effect of the alpha-substituent. Controlled acidic hydrolysis of esters 3 afforded the corresponding acids 4 with minimal racemization. Boron tribromide demethylation of (R)- and (S)-4d gave without racemization the hydroxyacids (R)- and (S)-4e, known precursors of (R)- and (S)-iodoalphionic acid. Copyright (C) 1996 Elsevier Science Ltd
Heterogeneous Enantioselective Hydrogenation of Hydroxy-substituted (E)-2,3-diphenylpropenoic Acids over Pd/Al2O3 Modified by Cinchonidine
作者:György Szőllősi
DOI:10.1007/s10562-012-0777-5
日期:2012.3
The enantioselectivehydrogenation of (E)-2,3-diphenylpropenoic acids substituted by hydroxyl group has been studied over Pd/Al2O3 catalyst modified by cinchonidine. The effect of the acidic hydroxyl substituents was compared with that of the methoxy group in the same position. The para-hydroxyl substituent on the 3-phenyl ring had similar effect on the enantioselectivity as the methoxy group, whereas
Potent α4β1 Peptide Antagonists as Potential Anti-Inflammatory Agents
作者:David Y. Jackson、Clifford Quan、Dean R. Artis、Thomas Rawson、Brent Blackburn、Martin Struble、Geraldine Fitzgerald、Kathryn Chan、Sheldon Mullins、J. P. Burnier、Wayne J. Fairbrother、Kevin Clark、Maureen Berisini、Henry Chui、Mark Renz、Susan Jones、Sherman Fong
DOI:10.1021/jm970175s
日期:1997.10.1
migration, adhesion, and subsequent extravasation of leukocytes into inflamed tissues contribute to the pathogenesis of a variety of inflammatorydiseases including asthma, rheumatoid arthritis, inflammatoryboweldisease, and multiple sclerosis. The integrin adhesion receptor alpha 4 beta 1 expressed on leukocytes binds to the extracellular matrix protein fibronectin and to the cytokine inducible vascular
Design and Evaluation of Hydroxamate Derivatives as Metal-Mediated Inhibitors of a Protein Tyrosine Kinase
作者:Xianfeng Gu、Yuehao Wang、Anil Kumar、Guofeng Ye、Keykavous Parang、Gongqin Sun
DOI:10.1021/jm061058c
日期:2006.12.1
Protein tyrosine kinases use two Mg2+ ions as cofactors in catalysis, one as the ATP-Mg complex (M1) and the other as an essential activator (M2). The M2-binding site has high affinity for transition metal cations such as cobalt and zinc. Taking advantage of this high affinity, we examined hydroxamates as metal-mediated inhibitors against C-terminal Src kinase (Csk), a protein tyrosine kinase. Of a small group of amino acid hydroxamates, tyrosine and phenylalanine hydroxamates inhibited Csk activity only in the presence of Co2+. Four classes of phenylalanine and tyrosine hydroxamate derivatives were synthesized and evaluated as metal-mediated inhibitors of Csk, leading to improved inhibition and a better understanding of the structure-activity relationships. This study suggests that hydroxamates may serve as a general scaffold for developing metal-mediated inhibitors against protein tyrosine kinases. To the best of our knowledge, this is the first report of designing metal-mediated inhibitors against a protein tyrosine kinase by targeting a metal binding site.
Deracemization of α-substituted arylacetic acids
作者:Pelayo Camps、Sílvia Giménez
DOI:10.1016/0957-4166(96)00129-2
日期:1996.4
Reaction of rac-alpha-substituted arylacetyl chlorides with (R)- and (S)-3-hydroxy-4,4-dimethyl-1-phenyl-2-pyrrolidinone under standard esterification conditions, gave esters (3R,alpha R)- and (3S,alpha S)-3, respectively, with a diastereoselectivity which diminishes on increasing the steric effect of the alpha-substituent. Controlled acidic hydrolysis of esters 3 afforded the corresponding acids 4 with minimal racemization. Boron tribromide demethylation of (R)- and (S)-4d gave without racemization the hydroxyacids (R)- and (S)-4e, known precursors of (R)- and (S)-iodoalphionic acid. Copyright (C) 1996 Elsevier Science Ltd