Hydrochloric Acid → 1,2,3-Benzothiadiazol-7-ylmethanol

To a solution of methyl 1,2,3-benzothiadiazole-7-carboxylate (10.0 g, 51.5 mmol) in tetrahydrofuran (200 mL) was added a solution (1 M, 154 mL, 154 mmol) of diisobutylaluminum hydride in hexane at −78° C. and the mixture was stirred for 20 min. The mixture was stirred at room temperature for 1 hr, water and 1 M aqueous sodium hydroxide solution (20 mL) were added at 0° C., and the mixture was stirred at 0° C. for 10 min. To the reaction mixture was added 6 M hydrochloric acid (10 mL) and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, and dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by recrystallization (ethyl acetate/methanol) to give the title compound (8.25 g, yield 96%).

1. stirringThe mixture was stirred at room temperature for 1 hr
2. stirringthe mixture was stirred at 0° C. for 10 min
3. extractionthe mixture was extracted with ethyl acetate
4. washThe extract was washed with saturated brine
5. dry with materialdried over anhydrous sodium sulfate
6. customthe solvent was evaporated under reduced pressure
7. customThe residue was purified by recrystallization (ethyl acetate/methanol)

ORD record

ord-df1a975597b14c1e8058d5065d51459b

Source dataset

uspto-grants-2012_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08110585B2