Iodinated tomoxetine derivatives as selective ligands for serotonin and norepinephrine uptake sites.

Abstract:

:In order to develop selective radioactive ligands for the study of presynaptic monoamine uptake sites, iodinated derivatives of tomoxetine were synthesized and evaluated in radioligand binding assays. Iodotomoxetine derivatives showed high affinity for serotonin (5-HT) uptake sites using a rat cortical membrane preparation. Compound 1R,(R)-(-)-N-methyl-3-(4-iodo-2-methylphenoxy)-3-phenylpropanamine , was the most potent and showed high stereoselectivity for 5-HT uptake sites (Ki, R isomer = 0.65 nM, S isomer = 13.9 nM). Changing the position of the methyl group or eliminating the methyl group at the phenoxy ring resulted in a loss of stereoselectivity. Substitution of the methyl group of tomoxetine with iodine gave the R and S isomers of N-methyl-3-(2-iodophenoxy)-3-phenylpropanamine 4R and 4S. These compounds displayed stereoselectivity for the norepinephrine (NE) (Ki values = 0.24 and 9.35 nM for R and S isomers, respectively). The in vitro binding data suggest that 1R and 4R are potential radioiodinated ligands for pharmacological studies of 5-HT and NE uptake sites, respectively.

journal_name

J Med Chem

authors

Chumpradit S,Kung MP,Panyachotipun C,Prapansiri V,Foulon C,Brooks BP,Szabo SA,Tejani-Butt S,Frazer A,Kung HF

doi

10.1021/jm00101a029

keywords:

subject

Has Abstract

pub_date

1992-11-13 00:00:00

pages

4492-7

issue

23

eissn

0022-2623

issn

1520-4804

journal_volume

35

pub_type

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