Hydrochloric Acid → HCID 59334636, compound

To a solution of methyl 7-chloro-2-methyl-2H-indazole-4-carboxylate (4.10 g, 18.3 mmol) in tetrahydrofuran (100 mL) was added a solution (1 M, 54.8 mL, 54.8 mmol) of diisobutylaluminum hydride in hexane at −78° C., and the mixture was stirred for 20 min. The reaction mixture was warmed to room temperature, and the mixture was stirred at room temperature for 1 hr. Water was added to the reaction mixture at 0° C. An aqueous sodium hydroxide solution (1 N, 20 mL) was added, and the mixture was stirred at 0° C. for 10 min. The reaction mixture was acidified with 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 flash silica gel column chromatography (ethyl acetate/hexane=1/1) to give the title compound (3.40 g, yield 95%).

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 flash silica gel column chromatography (ethyl acetate/hexane=1/1)

ORD record

ord-46b1d92dfeef449ca995b0cfe23724bf

Source dataset

uspto-grants-2012_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08110585B2