Synthesis and structure-affinity relationships of new 4-(6-iodo-H-imidazo[1,2-a]pyridin-2-yl)-N-dimethylbenzeneamine derivatives as ligands for human beta-amyloid plaques.

Abstract:

:A new and extensive set of 4-(6-iodo-H-imidazo[1,2-a]pyridin-2-yl)-N-dimethylbenzeneamine (IMPY) derivatives was synthesized and assayed for affinity toward human Abeta plaques. 6-Ethylthio- (12h), 6-cyano- (12e), 6-nitro- (12f), and 6-p-methoxybenzylthio- (15d) analogues were discovered to have high affinity (KI < 10 nM). However, introduction of a hydrophilic thioether group in the 6-position (15a-c, 15e-g) reduced or abolished affinity. In secondary N-methyl analogues, a bromo substituent in the adjacent ring position (14a) imparted high affinity (KI = 7.4 nM) whereas a methyl substituent did not (14c). The tolerance for nonhydrophilic thioether substituents in the 6-position opens up the possibility of developing new sensitive positron emission tomography radioligands for imaging human Abeta plaques in Alzheimer's disease, especially in view of the amenability of thioethers to be labeled with carbon-11 or fluorine-18 through S-alkylation reactions. The structure-activity relationships revealed in this study extends insight into the topography of the binding site for IMPY-like ligands in human Abeta plaques.

journal_name

J Med Chem

authors

Cai L,Cuevas J,Temme S,Herman MM,Dagostin C,Widdowson DA,Innis RB,Pike VW

doi

10.1021/jm0702231

subject

Has Abstract

pub_date

2007-09-20 00:00:00

pages

4746-58

issue

19

eissn

0022-2623

issn

1520-4804

journal_volume

50

pub_type

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