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Previous structure-activity relationship studies in the tetrahydroisoquinoline and pyrazolo-tetrahydropyridine series have indicated that two substituents are mandatory for the aryl or heterocycle moiety in order to reach potent affinities with both orexin receptors. Imidazoles were considered as a valuable heterocyclic replacement for the dimethoxyphenyl moiety due to the fact that they can be conveniently disubstituted, and the versatile chemistry of imidazoles allows the introduction of diverse substituents having different electronic properties.
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Previous structure-activity relationship studies in the tetrahydroisoquinoline and pyrazolo-tetrahydropyridine series have indicated that two substituents are mandatory for the aryl or heterocycle moiety in order to reach potent affinities with both orexin receptors. Imidazoles were considered as a valuable heterocyclic replacement for the dimethoxyphenyl moiety due to the fact that they can be conveniently disubstituted, and the versatile chemistry of imidazoles allows the introduction of diverse substituents having different electronic properties.
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2-Substituted imidazoles 1 used for the investigations are either commercially available or specifically synthesized (Scheme 3). Substituents R corresponding to these 2-substituted imidazoles 1 are listed in Table 2.
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2-Substituted imidazoles 1 used for the investigations are either commercially available or specifically synthesized (Scheme 3). Substituents R corresponding to these 2-substituted imidazoles 1 are listed in Table 2.
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