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0 °C

In a 300 mL three-neck flask were put 10 g (92 mmol) of 2-aminophenol, 7.0 mL of triethylamine, and 100 mL of tetrahydrofuran (THF). This solution was stirred at 0° C. for 20 minutes. Then, a mixed solution of 4-iodobenzoic acid chloride (0.10 mol) and 100 mL of tetrahydrofuran (abbreviation: THF) was dripped to the solution. This solution was stirred under a nitrogen stream at 0° C. for 5 hours. After that, about 300 mL of water was added to this solution, followed by extraction with ethyl acetate. Then, the organic layer and the extract were combined and washed with 1M hydrochloric acid, a saturated aqueous sodium hydrogen carbonate solution, and saturated brine in that order. After that, magnesium sulfate was added to the organic layer to dry it. Next, this mixture was suction filtered through Celite (produced by Wako Pure Chemical Industries, Ltd., Catalog No. 531-16855). The resulting filtrate was concentrated to give a solid. This solid was recrystallized with a mixed solvent of ethyl acetate and hexane to give 30 g of a white powdered solid in a yield of 97% through the two steps, Synthesis Schemes (D-1) and (D-2).

1. customIn a 300 mL three-neck flask were put
2. stirringThis solution was stirred under a nitrogen stream at 0° C. for 5 hours
3. extractionfollowed by extraction with ethyl acetate
4. washwashed with 1M hydrochloric acid
5. additionAfter that, magnesium sulfate was added to the organic layer
6. customto dry it
7. filtrationfiltered through Celite (produced by Wako Pure Chemical Industries, Ltd., Catalog No. 531-16855)
8. concentrationThe resulting filtrate was concentrated
9. customto give a solid
10. customThis solid was recrystallized with a mixed solvent of ethyl acetate and hexane