2-Pyridinamine, 5-iodo- → 2-(3'-Hydroxyphenyl)-6-iodoimidazo[1,2-a]pyridine

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987 mg (corresponding to 4.55 mmol) of 2-bromo-3′-hydroxyacetophenone and 1.00 g (corresponding to 4.55 mmol) of 2-amino-5-iodopyridine were dissolved in 50 mL of acetonitrile. The resulting solution was heated under reflux in an oil bath at 110° C. for 2 hours. After the completion of the reaction, the reaction solution was cooled down to room temperature, and precipitates were filtered and recovered. The precipitates were washed with acetonitrile and dried under reduced pressure. The resulting crude crystals were suspended in a mixed solution of 10 mL of water and 1 mL of methanol. Then, about 10 mL of a saturated sodium hydrogencarbonate solution was added thereto, and the mixture was sonicated for 5 minutes using an ultrasonic washing machine. Precipitates were filtered and recovered from the resulting mixture, sufficiently washed with water, and dried under reduced pressure, to obtain 927 mg (corresponding to 2.76 mmol) of 2-(3′-hydroxyphenyl)-6-iodoimidazo[1,2-a]pyridine (FIG. 8, Step 2).

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