Benzyl Bromide → HCID 90033741, compound

Temperature

0 °C

Into a 100-mL 3-neck round-bottom flask, was placed a solution of ethyl 4-methyl-1H-pyrazole-3-carboxylate (1.0 g, 6.5 mmol) in tetrahydrofuran (20 mL). The solution was cooled to 0° C., then sodium hydride (360 mg, 9.00 mmol, 60% dispersion in mineral oil) was added in portions and the mixture was stirred for 20 min. Benzyl bromide (904 μL, 7.60 mmol) was added at 0° C., then the resulting mixture was stirred for 1.5 h at room temperature. The reaction was carefully quenched with by drop-wise addition of water (35 mL) and the mixture was extracted with ethyl acetate (3×100 mL). The combined organic extracts were washed with of brine (3×100 mL), dried (Na2SO4), filtered and concentrated under reduced pressure. The residue was purified by a silica gel chromatography with ethyl acetate/petroleum ether (1:20-1:2) as eluent to obtain the title compound as a yellow solid (1.0 g, 63%).

1. customInto a 100-mL 3-neck round-bottom flask, was placed
2. stirringthe resulting mixture was stirred for 1.5 h at room temperature
3. customThe reaction was carefully quenched with by drop-wise addition of water (35 mL)
4. extractionthe mixture was extracted with ethyl acetate (3×100 mL)
5. washThe combined organic extracts were washed with of brine (3×100 mL)
6. dry with materialdried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customThe residue was purified by a silica gel chromatography with ethyl acetate/petroleum ether (1:20-1:2) as eluent

ORD record

ord-d456d1b95635470ba8ada2cc4661b3c0

Source dataset

uspto-grants-2016_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09428502B2