期刊
BIOORGANIC & MEDICINAL CHEMISTRY
卷 21, 期 23, 页码 7435-7452出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmc.2013.09.044
关键词
Alzheimer's disease; Anellated xanthines; Tetrahydropyrimido[2,1-f]purinediones; Adenosine A(1) receptor antagonists; Adenosine A(2A) receptor antagonists; Caffeine derivatives; Monoamine oxidase B inhibitors; Parkinson's disease; Tricyclic compounds; Synthesis
资金
- Federal Ministry of Education and Research (BMBF) within the BioPharma-Neuroallianz consortium
- UCB Pharma GmbH, Monheim, Germany
Adenosine receptors and monoamine oxidases are drug targets for neurodegenerative diseases such as Parkinson's and Alzheimer's disease. In the present study we prepared a library of 55 mostly novel tetrahydropyrimido[2,1-f]purinediones with various substituents in the 1- and 3-position (1,3-dimethyl, 1,3-diethyl, 1,3-dipropyl, 1-methyl-3-propargyl) and broad variation in the 9-position. A synthetic strategy to obtain 3-propargyl-substituted tetrahydropyrimido[2,1-f]purinedione derivatives was developed. The new compounds were evaluated for their interaction with all four adenosine receptor subtypes and for their ability to inhibit monoamine oxidases (MAO). Introduction of mono-or di-chloro-substituted phenyl, benzyl or phenethyl residues at N9 of the 1,3-dimethyl series led to the discovery of a novel class of potent MAO-B inhibitors, the most potent compound being 9-(3,4-dichlorobenzyl)-1,3-dimethyl-6,7,8,9-tetrahydropyrimido[1,2-f]purine-2,4(1H,3H)-dione (21g, IC50 human MAO-B: 0.0629 mu M), which displayed high selectivity versus the other investigated targets. Potent dually active A(1)/A(2A) adenosine receptor antagonists were identified, for example, 9-benzyl-1-methyl-3-propargyl-6,7,8,9-tetrahydropyrimido[1,2-f]purine-2,4(1H,3H)dione (19f, K-i, human receptors, A(1): 0.249 mu M, A(2A): 0.253 mu M). Several compounds showed triple-target inhibition, the best compound being 9-(2-methoxybenzyl)-1-methyl-3-(prop-2-ynyl)-6,7,8,9-tetrahydro pyrimido [1,2-f]purine-2,4(1H,3H)-dione (19g, K-i A(1): 0.605 mu M, K-i A(2A): 0.417 mu M, IC50 MAO-B: 1.80 mu M). Compounds inhibiting several different targets involved in neurodegeneration may exhibit additive or even synergistic effects in vivo. (C) 2013 Elsevier Ltd. All rights reserved.
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