[NH2:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[OH:8].C(N(CC)CC)C.O1CCCC1.[Br:21][C:22]1[CH:30]=[CH:29][C:25]([C:26](Cl)=[O:27])=[CH:24][CH:23]=1>O>[Br:21][C:22]1[CH:30]=[CH:29][C:25]([C:26]([NH:1][C:2]2[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=2[OH:8])=[O:27])=[CH:24][CH:23]=1In a 200 mL three-necked flask were placed 2.2 g (20 mmol) of 2-aminophenol, 3.0 mL (22 mmol) of triethylamine, and 50 mL of tetrahydrofuran (THF). Then, the mixture was cooled to 0° C. After cooling, 50 mL of a THF solution containing 4.5 g (20 mmol) of 4-bromobenzoyl chloride was dripped under a nitrogen stream. This solution was stirred at 0° C. for 4 hours under a nitrogen stream. After a certain time, water was added to the solution, and an aqueous layer was extracted with ethyl acetate. The resulting extract was combined with the organic layer, and the organic layer was washed with 0.2 M hydrochloric acid and a saturated aqueous solution of sodium bicarbonate, and then dried with magnesium sulfate. The mixture was subjected to suction filtration through Celite (produced by Wako Pure Chemical Industries, Ltd., Catalog No. 531-16855), and the filtrate was condensed to give a solid. The obtained solid was recrystallized with ethyl acetate/hexane, so that 5.3 g of target white powder was obtained in a yield of 88%.
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