Hydrogen Bromide → HCID 86665170, compound

According to Scheme 2, Step 2: To a solution of 1-(4-methoxybenzyl)-3-methyl-1H-pyrazole-4-carboxylic acid (37.8 mmol, 9.30 g) and five drops of DMF in DCM (94 mL) was added oxalyl chloride (76 mmol, 6.66 mL) dropwise, at 0° C. The reaction mixture was allowed to warm up to room temperature and was stirred for 3 hours. After concentration, the residue was treated with toluene and was co-evaporated to dryness to yield 1-(4-methoxybenzyl)-3-methyl-1H-pyrazole-4-carbonyl chloride. To a solution of 1-(4-methoxybenzyl)-3-methyl-1H-pyrazole-4-carbonyl chloride (37.8 mmol) in acetonitrile (94 mL) was added a solution of TMSCHN2 (41.5 mmol, 83.0 mL) dropwise, at 0° C., and then the reaction mixture was allowed to warm up to room temperature and was stirred overnight. After cooling the reaction mixture to −10° C., HBr 48% (14.8 mL) was added dropwise and the reaction mixture was stirred for 2 hours at −10° C. At 0° C., 10% NaOH solution was added to the reaction mixture to reach pH=7. The reaction mixture was diluted with water and EtOAc and the aqueous phase was extracted with EtOAc. The organic phase was dried over MgSO4, was filtered and was concentrated under reduced pressure to yield 2-bromo-1-(1-(4-methoxybenzyl)-3-methyl-1H-pyrazol-4-yl)ethanone (30.6 mmol, 9.90 g, 81%) which was used without any purification.

1. customat 0° C.
2. temperatureAfter cooling the reaction mixture to −10° C.
3. stirringthe reaction mixture was stirred for 2 hours at −10° C
4. extractionthe aqueous phase was extracted with EtOAc
5. dry with materialThe organic phase was dried over MgSO4
6. filtrationwas filtered
7. concentrationwas concentrated under reduced pressure

ORD record

ord-5686282b2dbc47c99e822a386358156a

Source dataset

uspto-grants-2013_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08513252B2