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A flask equipped with a stirrer and a thermometer was charged with 26.98 g of the intermediate 3-bromo-7-nitrodibenzothiophene-5-oxide prepared in Example 1-2 and 269.8 g of glacial acetic acid in a nitrogen atmosphere. 112.7 g of SnCl2.2H2O dissolved in 158 g of concentrated hydrochloric acid was added dropwise at 14 to 18° C. over 1 hour, and stirred overnight at room temperature. The resulting reactant was filtered, washed with 1:1 glacial acetic acid/concentrated hydrochloric acid, and neutralized with 1100 g of a 7 wt % aqueous solution of sodium hydroxide. The reactant was extracted with ethyl acetate, washed with water, concentrated, and purified by silica gel chromatography using 1:1 hexane/chloroform mixed with 0.1 wt % triethylamine as an eluting solvent, to thereby obtain 17.31 g of objective 7-bromodibenzothiophene-3-yl-amine. The product was subjected to elemental analysis, the results of which are as follows:

1. customA flask equipped with a stirrer
2. additionwas added dropwise at 14 to 18° C. over 1 hour
3. filtrationThe resulting reactant was filtered
4. washwashed with 1:1 glacial acetic acid/concentrated hydrochloric acid
5. extractionThe reactant was extracted with ethyl acetate
6. washwashed with water
7. concentrationconcentrated
8. custompurified by silica gel chromatography
9. additionmixed with 0.1 wt % triethylamine as an eluting solvent