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Abstract

A process for preparing a compound of formula (II)

wherein R1 denotes bromine,

wherein, a compound of formula (IV)

is reacted with elemental bromine in a diluent.

Other References

• Trapani, ET AL; “Novel 2-Phenylimidazo[1,2-alpha]pyridine Derivatives as Potent and Selective Ligands for Peripheral Benzodlazepine Receptors: Synthesis, Binding Affinity, and in Vivo Studies”; J. Med. Chem. 1999, 42(19), pp. 3934-3941.
• Trapani, ET AL; “Synthesis and Binding Affinity of 2-Phenylimidazo[1,2-alpha]pyridine Derivatives for both Central and Peripheral Benzodiazepine Receptors. A New Series of High-Affinity and Selective Ligands for the Peripheral Type”; J. Med. Chem. 1997, 40(19), pp. 3109-3118.