Med Chem 2007 Nov 01;36:561-71. doi: 10.2174/157340607782360335.

Design and synthesis of new N-OMe fluoro-indole melatoninergics.

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The synthesis of a series of new N-OMe fluoro-indoles with melatoninergic activity in the Xenopus melanophore assay is described. All of the 4-F substituted compounds, 22a-e and 25a,b, were antagonists on the clonal Xenopus melanophore line. Conversely, the 5-F substituted analogs (15a-e) did not share the same pharmacological profile, as two of them, compounds 15d (R=c-C(3)H(5)) and 15e (R=c-C(4)H(7)), exhibited a weak agonistic and partial agonistic activity, respectively, whilst the other three (15a-c) were all agonists. It seems that in this case the nature of the response (agonist or antagonist activity) is solely dependent on the shape of the R group.

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