N6,9-Disubstituted adenines: potent, selective antagonists at the A1 adenosine receptor
作者:Robert D. Thompson、Sherrie Secunda、John W. Daly、Ray A. Olsson
DOI:10.1021/jm00113a029
日期:1991.9
N6-Substituted 9-methyladenines are potent antagonists of the activation of A1 adenosine receptors. The present study assessed the effect of N6 and N-9 substituents on the binding of adenines to the A1 and A2 receptors, respectively, of rat brain cortex and striatum and also on the antagonism of the A2 receptor mediated stimulation of the adenylate cyclase of PC12 cells by N-ethyladenosine-5'-uronamide. The potency ranking of 9-substituted adenines varied directly with the hydrophobicity of the substituent: cyclopentyl > phenyl > tetrahydrofuryl > methyl > 2-hydroxyethyl. The 9-substituted adenines showed little selectivity for either receptor and the R enantiomer of N6-(1-phenyl-2-propyl)-9-methyladenine was only 4-fold more potent than the S enantiomer at the A1 receptor. An N6-cyclopentyl substituent increased potency at the A1 receptor and decreased potency at the A2 receptor, resulting in selectivity for the A1 receptor of up to 39-fold. The N6-cyclophenyl group completely overshadowed the effect of the hydrophobicity of the 9-substituent. A 2-chloro substituent did not alter the potency of an N6-substituted 9-methyladenine.
HAYASHI EISAKU; SHIMADA NORIAKI, YAKUGAKU DZASSI, YAKUGAKU ZASSNI, J. PHARM. SOS. JAR., 1979, 99, NO 2, 20+
作者:HAYASHI EISAKU、 SHIMADA NORIAKI
DOI:——
日期:——
Enhanced selectivity for inhibition of analog-sensitive protein kinases through scaffold optimization
作者:Chao Zhang、Kevan M. Shokat
DOI:10.1016/j.tet.2007.02.089
日期:2007.6
highly potent mutant kinase-specific inhibitorsbased on a pyrazolopyrimidine scaffold. Here, we asked if the selectivity of the resulting pyrazolopyrimidines could be improved, as they inhibit several wild-type kinases with low-micromolar IC50 values. Our approach to improve the selectivity of allele-specific inhibitors was to explore a second kinaseinhibitorscaffold. A series of 6,9-disubstituted purines
Ruthenium-Catalyzed Oxidative Annulation of 6-Anilinopurines with Alkynes<i>via</i>CH Activation: Synthesis of Indole-Substituted Purines/Purine Nucleosides
作者:Srinivasarao Allu、K. C. Kumara Swamy
DOI:10.1002/adsc.201500314
日期:2015.8.24
Indole‐substituted purine nucleobases have been synthesized by Ru‐catalyzed oxidative annulation of 6‐anilinopurines with internal alkynes that involves CHactivation. Unsymmetrical aryl(alkyl)alkynes led to high regioselectivity. The reaction was also successful with nucleosides by delivering unprotected indole‐substituted nucleosides. In the presence of [RuCl2(p‐cymene)]2 and copper(II) acetate