Compounds of formula (I) are A2B receptor antagonists, wherein R1 is optionally substituted aryl or an optionally substituted 5- or 6-membered heteroaryl ring; R2 and R3 are independently selected from hydrogen, C1-C6 alkyl, C3-C8 cycloalkyl, C3-C8 cycloalkyl-(C1-C6)-alkyl, aryl-(C1-C6)-alkyl optionally substituted in the ring part thereof, a 5- or 6-membered monocyclic heterocyclic group optionally linked via a C1-C6 alkylene chain and optionally substituted in the ring part thereof, benzimidazol-2-yl-methyl, pyrid-3-yl-carbonyl, or (1-methyl-piperidin-4-yl)-carbonyl-methyl; or R2 and R3 taken together with the nitrogen atom to which they are attached form an optionally substituted 5- or 6-membered ring; R4 is C1-C3 alkyl, C2-C3 alkenyl, —N(—R5)—R6, or optionally substituted heteroarylmethylamino; and R5 and R6 are independently selected from hydrogen or C1-C3 alkyl; or R5 and R6 taken together with the nitrogen atom to which they are attached form an optionally substituted 4- to 6-membered saturated ring.
Compounds of formula (I) are A
2B
receptor antagonists:
Wherein R
1
is optionally substituted aryl or an optionally substituted 5- or 6-membered heteroaryl ring; R
2
and R
3
are independently selected from hydrogen, C
1
-C
6
alkyl, C
3
-C
8
cycloalkyl, C
3
-C
8
cycloalkyl-(C
1
-C
6
)-alkyl, aryl-(C
1
-C
6
)-alkyl optionally substituted in the ring part thereof, a 5- or 6-membered monocyclic heterocyclic group optionally linked via a C
1
-C
6
alkylene chain and optionally substituted in the ring part thereof, benzimidazol-2-yl-methyl, pyrid-3-yl-carbonyl, or (1-methyl-piperidin-4-yl)-carbonyl-methyl; or R
2
and R
3
taken together with the nitrogen atom to which they are attached form an optionally substituted 5- or 6-membered ring; R
4
is C
1
-C
3
alkyl, C
2
-C
3
alkenyl, —(—R
5
)—R
6
, or optionally substituted heteroarylmethylamino; and R
5
and R
6
are independently selected from hydrogen or C
1
-C
3
alkyl; or R
5
and R
6
taken together with the nitrogen atom to which they are attached form an optionally substituted 4- to 6-membered saturated ring.
Discovery and optimization of potent and selective functional antagonists of the human adenosine A2B receptor
作者:Simon T. Bedford、Karen R. Benwell、Teresa Brooks、Ijen Chen、Mike Comer、Sarah Dugdale、Tim Haymes、Allan M. Jordan、Guy A. Kennett、Anthony R. Knight、Burkhard Klenke、Loic LeStrat、Angela Merrett、Anil Misra、Sean Lightowler、Anthony Padfield、Karine Poullennec、Mark Reece、Heather Simmonite、Melanie Wong、Ian A. Yule
DOI:10.1016/j.bmcl.2009.08.040
日期:2009.10
We herein report the discovery of a novel class of antagonists of the human adenosine A2B receptor. This low molecular weight scaffold has been optimized to offer derivatives with potential utility for the alleviation of conditions associated with this receptor subtype, such as nociception, diabetes, asthma and COPD. Furthermore, preliminary pharmacokinetic analysis has revealed compounds with profiles suitable for either inhaled or systemic routes of administration. (C) 2009 Elsevier Ltd. All rights reserved.