Dimethylformamide → 5-(4-methoxy-3-methyl-phenyl)-1-methyl-1H-pyrazole

Participants

Reaction Steps

At room temperature, to a mixture of 3-(4-methoxy-3-methyl-phenyl)-1H-pyrazole (described in Reference Preparation example 44) 5.38 g and N,N-dimethylformamide 100 ml was added 55% sodium hydride 1.5 g and the resulting mixture was stirred for a half hour and thereto was added methyl iodide 7.9 g. The resulting mixture was stirred for twelve hours and thereto was added water, and then the resulting mixture was extracted with ethyl acetate. The organic layer was washed with water, and was dried over anhydrous magnesium sulfate and was then concentrated under reduced pressure. The resulting residue was subjected to a silica gel column chromatography to give 3-(4-methoxy-3-methyl-phenyl)-1-methyl-1H-pyrazole 2.9 g and 5-(4-methoxy-3-methyl-phenyl)-1-methyl-1H-pyrazole 1.0 g.

Provenance & Evidence