Pyrazole → 1-(ethoxymethyl)-1H-pyrazole

Temperature

0 °C

To a mixture of pyrazole (10 g, 0.150 mol) and potassium carbonate (22.3 g, 0.162 mol) in acetone (200.0 mL), cooled to 0° C. under nitrogen, was added chloromethyl ethyl ether (15.0 mL, 0.162 mol) via syringe over a period of 20 minutes. The reaction was stirred for 30 minutes at 0° C. and then for 2 hours at room temperature. The mixture was filtered, washing the solid with acetone (200.0 mL). The filtrate was carefully concentrated in vacuo (at 400 mbar). The crude material was purified by flash column chromatography eluting with pentane:diethylether (1:1, by volume) to afford the title compound as a colourless oil, 9.3 g, 50% yield.

1. waitfor 2 hours at room temperature
2. filtrationThe mixture was filtered
3. washwashing the solid with acetone (200.0 mL)
4. concentrationThe filtrate was carefully concentrated in vacuo (at 400 mbar)
5. customThe crude material was purified by flash column chromatography
6. washeluting with pentane:diethylether (1:1, by volume)

ORD record

ord-e3928085010e40fd8a4f955e9f1987f4

Source dataset

uspto-grants-2012_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08153814B2