Hydrochloric Acid → Benzothiazole, 6-bromo-2-methyl-

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In a mixed solvent of THF (200 mL) and NMP (20 mL) were dissolved 6-bromo-2-chlorobenzothiazole 1 (15 g, 60.4 mmol) and Fe(acac)3 (1.07 g, 3.02 mmol). To the obtained mixture was added at 0° C. 3M methyl magnesium bromide ethereal solution (24.14 ml, 72.4 mmol). It was stirred at room temperature for 1.5 hours. To the reaction mixture was added at 0° C. 3M methyl magnesium bromide ethereal solution (10.1 ml, 30.2 mmol). It was stirred at room temperatures for 1 hour. To the reaction mixture 1N aqueous hydrochloric acid and ethyl acetate. After extraction, the organic layer was washed with brine and dried over magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was purified with column chromatography to give Compound 53 (10.6 g, 46.5 mmol).

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