反应详情

温度

2.5 °C

A mixture of 3-[4-(propan-2-yloxy)phenyl]-1H-pyrazole-4-carbaldehyde hydrochloride (400 mg, 1.5 mmol) and K2CO3 (624 mg, 4.5 mmol) in acetonitrile (6 ml) was stirred at 0-5° C. for 1 h. Methyl iodide (310 mg, 2.2 mmol) was added and stirred at ambient temperature for 48 h. The reaction was poured into water (200 mL), extracted with EtOAc (50 mL×3). The combined extracts were washed with brine (100 mL), dried, and concentrated under vacuum. The residue was purified by prep-TLC using Hexane:EtOAc (21:9) as eluent to afford 5-(4-isopropoxyphenyl)-1-methyl-1H-pyrazole-4-carbaldehyde (88 mg, Yield 21%) as a white solid. 1H NMR (400 MHz, CDCl3): δ 9.63 (s, 1H), 8.05 (s, 1H), 7.36-7.32 (m, 2H), 7.06-7.02 (m, 2H), 4.69-4.64 (m, 1H), 3.84 (s, 3H), 1.0 (d, J=6 Hz, 6H) ppm. LCMS (method C): RT=2.11 min, m/z=245.5 [M+H]+.

1. stirringstirred at ambient temperature for 48 h
2. extractionextracted with EtOAc (50 mL×3)
3. washThe combined extracts were washed with brine (100 mL)
4. customdried
5. concentrationconcentrated under vacuum
6. customThe residue was purified