New pyrrolopyrimidin-6-yl benzenesulfonamides: Potent A2B adenosine receptor antagonists
摘要:
A new series of 4-(1,3-dialkyl-2,4-dioxo-2,3,4,5-tetrahydro-1H-pyrrolo[3,2-d]pyrimidin-6-yl)benzenesulfonamides has been identified as potent AZB adenosine receptor antagonists. The products have been evaluated for their binding affinities for the human A(2B), A(1) and A(3) adenosine receptors. 6-(4-{[4-(4-Bromobenzyl)piperazin-1-yl]sulfonyl}phenyl)-1,3-dimethyl-1H-pyrrolo[3,2-d]pyrimidine-2,4(3H,5H)-dione (16) showed a high affinity for the AZB adenosine receptor (IC50 = 1 nM) and selectivity (A(1): 183x; A(30): 12660x). Synthesis and SAR of this novel class of compounds showing improved absorption properties is presented herein. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis and Structure-Activity Relationships of Deazaxanthines: Analogs of Potent A1- and A2-Adenosine Receptor Antagonists
摘要:
A set of 22 9-deazaxanthines (pyrrolo[3,2-d]pyrimidine-2,4-diones) and three 7-deazaxanthines (pyrrolo[2,3-d] pyrimidine-2,4-diones) with various substituents in the 1-, 3-, 7- or 9-, and 8-positions was synthesized and investigated in A1 and A2a adenosine receptor binding assays at rat brain cortical membranes and rat brain striatal membranes, respectively. 9-Deazaxanthines showed structure-activity relationships that were similar to those of xanthines. They were about equipotent to the corresponding xanthines at A2a adenosine receptors. 9-Deazaxanthines were generally at least 2-3-fold more potent than xanthines at A1 receptors and therefore exhibited higher A1 selectivities compared to the xanthines. 1,3-Dimethyl-8-(2-naphthyl)-9-deazaxanthine (19e) showed high affinty (K-i = 26 nM) and selectivity for A1 adenosine receptors. A hydroxyl function at N7 of 9-deazaxanthines was unfavorable for A1 and A2a receptor binding. 7-Deazaxanthines were considerably less potent compared to xanthines and to 9-deazaxanthines at both receptor subtypes.
Synthesis and Structure-Activity Relationships of Deazaxanthines: Analogs of Potent A1- and A2-Adenosine Receptor Antagonists
作者:Bettina Grahner、Susanne Winiwarter、Wolfgang Lanzner、Christa E. Mueller
DOI:10.1021/jm00036a019
日期:1994.5
A set of 22 9-deazaxanthines (pyrrolo[3,2-d]pyrimidine-2,4-diones) and three 7-deazaxanthines (pyrrolo[2,3-d] pyrimidine-2,4-diones) with various substituents in the 1-, 3-, 7- or 9-, and 8-positions was synthesized and investigated in A1 and A2a adenosine receptor binding assays at rat brain cortical membranes and rat brain striatal membranes, respectively. 9-Deazaxanthines showed structure-activity relationships that were similar to those of xanthines. They were about equipotent to the corresponding xanthines at A2a adenosine receptors. 9-Deazaxanthines were generally at least 2-3-fold more potent than xanthines at A1 receptors and therefore exhibited higher A1 selectivities compared to the xanthines. 1,3-Dimethyl-8-(2-naphthyl)-9-deazaxanthine (19e) showed high affinty (K-i = 26 nM) and selectivity for A1 adenosine receptors. A hydroxyl function at N7 of 9-deazaxanthines was unfavorable for A1 and A2a receptor binding. 7-Deazaxanthines were considerably less potent compared to xanthines and to 9-deazaxanthines at both receptor subtypes.
Fast and highly efficient one-pot synthesis of 9-deazaxanthines
SnCl2 enables a direct, high-yield conversion of 5-nitro-1,3-dialkyl-6-styryl(furyl-, thienyl-vinyl)-uracils to 8-substituted-9-deazaxanthines under very mild experimental conditions. The method has a general applicability and it is compatible with the reactivity of the most common organic functional groups. In slightly experimental different conditions, it allows a high-yield and fast (<5 min) preparation of pure 7-N-hydroxy-9-deazaxanthines. (C) 2003 Elsevier Science Ltd. All rights reserved.
8-Substituted-9-deazaxanthines as adenosine receptor ligands: design, synthesis and structure-affinity relationships at A2B
A number of 8-substituted-9-deazaxanthine derivatives (1,3-dialkyl-6-substituted-1H-pyrrolo[3,2-d]pyrimidine-2,4(3H,5H)-diones) were prepared and tested for their antagonistic activity at the recombinant human adenosine receptors, in particular at the A(2B) and A(2A) receptor subtypes. Compounds endowed with micromolar to nanomolar binding affinities, but with poor A(2B)/A(2A) selectivity, were obtained. Preliminary quantitative structure-affinity relationships suggested that the binding potency at the A(2B) receptor is mainly modulated by the electronic and lipophilic properties of the ligands. (C) 2004 Elsevier SAS. All rights reserved.
New pyrrolopyrimidin-6-yl benzenesulfonamides: Potent A2B adenosine receptor antagonists
A new series of 4-(1,3-dialkyl-2,4-dioxo-2,3,4,5-tetrahydro-1H-pyrrolo[3,2-d]pyrimidin-6-yl)benzenesulfonamides has been identified as potent AZB adenosine receptor antagonists. The products have been evaluated for their binding affinities for the human A(2B), A(1) and A(3) adenosine receptors. 6-(4-[4-(4-Bromobenzyl)piperazin-1-yl]sulfonyl}phenyl)-1,3-dimethyl-1H-pyrrolo[3,2-d]pyrimidine-2,4(3H,5H)-dione (16) showed a high affinity for the AZB adenosine receptor (IC50 = 1 nM) and selectivity (A(1): 183x; A(30): 12660x). Synthesis and SAR of this novel class of compounds showing improved absorption properties is presented herein. (c) 2006 Elsevier Ltd. All rights reserved.
1,3-Dialkyl-8-(hetero)aryl-9-OH-9-deazaxanthines as potent A2B adenosine receptor antagonists: Design, synthesis, structure–affinity and structure–selectivity relationships
A number of 1,3-dialkyl-8-(hetero)aryl-9-OH-9-deazaxanthines were prepared and evaluated as ligands of recombinant human adenosine receptors (hARs). Several 1,3-dipropyl derivatives endowed with nano-molar binding affinity at hA(2B) receptors, but poor selectivity over hA(2A), hA(1) and hA(3) AR subtypes were identified. A comparison with the corresponding 7-OH- and 7,9-unsubstituted-deazaxanthines revealed that 9-OH-9-deazaxanthines are more potent hA(2B) ligands with lower partition coefficients and higher water solubility compared to the other two congeneric classes of deazaxanthines. An optimization of the para-substituent of the 8-phenyl ring of 9-OH-9-deazaxanthines led to the discovery of compound 38, which exhibited outstanding hA(2B) affinity (Ki = 1.0 nM), good selectivity over hA(2A), hA(1) and hA(3) (selectivity indices = 100, 79 and 1290, respectively) and excellent antagonist potency in a functional assay on rat A(2B) (pA(2B) = 9.33). (C) 2008 Published by Elsevier Ltd.