期刊
JOURNAL OF MEDICINAL CHEMISTRY
卷 59, 期 7, 页码 3249-3263出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jmedchem.5b01998
关键词
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资金
- NIH Intramural Research Program (NIDDK) [ZIA DK031117-28]
- National Cancer Institute [R01CA169519]
- National Heart Lung Institute [R01HL077707, R01HL111392]
- National Institute of Mental Health's Psychoactive Drug Screening Program [HHSN-271-2008-00025-C]
Purine (N)-methanocarba-5'-N-alkyluronamidoriboside A(3) adenosine receptor (A(3)AR) agonists lacking an exocyclic amine resulted from an unexpected reaction during a Sonogashira coupling and subsequent aminolysis. Because the initial C6-Me and C6-styryl derivatives had unexpectedly high A(3)AR affinity, other rigid nucleoside analogues lacking an exocyclic amine were prepared. Of these, the C6-Me-(2-phenylethynyl) and C2-(5-chlorothienylethynyl) analogues were particularly potent, with human A(3)AR K-i values of 6 and 42 nM, respectively. Additionally, the C2-(5-chlorothienyl)-6-H analogue was potent and selective at A(3)AR (MRS7220, K-i 60 nM) and also completely reversed mouse sciatic nerve mechanoallodynia (in vivo, 3 mu mol/kg, po). The lack of a C6 H-bond donor while maintaining A(3)AR affinity and efficacy could be rationalized by homology modeling and docking of these hypermodified nucleosides. The modeling suggests that a suitable combination of stabilizing features can partially compensate for the lack of an exocyclic amine, an otherwise important contributor to recognition in the A(3)AR binding site.
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