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In an argon atmosphere, 51.5 ml (103 mmol) of a 2M lithium diisopropylamide solution (produced by Aldrich Company) was added to a solution of 13.6 g (103 mmol) of 5-metylimidazo[1,2-a]pyridine in 100 ml of tetrahydrofuran at -78° C. After stirring at constant temperature for 15 minutes, 17.64 g (103 mmol) of 1-bromo-4-chlorobutane was added, followed by stirring for 1 more hour. After stirring at 0° C. for 1 hour, the reaction mixture was poured into water, extracted with ethyl acetate, washed with water and dried, after which the solvent was distilled off. The residue was purified by column chromatography (eluent; ethyl acetate) to yield 18.74 g (81.7%, light yellow oily substance) of the desired product.

1. stirringby stirring for 1 more hour
2. stirringAfter stirring at 0° C. for 1 hour
3. extractionextracted with ethyl acetate
4. washwashed with water
5. customdried
6. distillationafter which the solvent was distilled off
7. customThe residue was purified by column chromatography (eluent; ethyl acetate)