Selected C8 two-chain linkers enhance the adenosine A1/A2A receptor affinity and selectivity of caffeine.

Abstract:

:Recent research exploring C8 substitution on the caffeine core identified 8-(2-phenylethyl)-1,3,7-trimethylxanthine as a non-selective adenosine receptor antagonist. To elaborate further, we included various C8 two-chain-length linkers to enhance adenosine receptor affinity. The results indicated that the unsubstituted benzyloxy linker (1e A1Ki = 1.52 μM) displayed the highest affinity for the A1 adenosine receptor and the para-chloro-substituted phenoxymethyl (1d A2AKi = 1.33 μM) linker the best A2A adenosine receptor affinity. The position of the oxygen revealed that the phenoxymethyl linker favoured A1 adenosine receptor selectivity over the benzyloxy linker and, by introducing a para-chloro substituent, A2A adenosine receptor selectivity was obtained. Selected compounds (1c, 1e) behaved as A1 adenosine receptor antagonists in GTP shift assays and therefore represent selective and non-selective A1 and A2A adenosine receptor antagonists that may have potential for treating neurological disorders.

journal_name

Eur J Med Chem

authors

van der Walt MM,Terre'Blanche G

doi

10.1016/j.ejmech.2016.09.072

subject

Has Abstract

pub_date

2017-01-05 00:00:00

pages

652-656

eissn

0223-5234

issn

1768-3254

pii

S0223-5234(16)30808-X

journal_volume

125

pub_type

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