Dimethylformamide → HCID 22054420, compound

Participants

Reaction Conditions

Reaction Steps

To a hot solution of 1-(diphenylmethyl)-3,5-dimethyl-(1H)-pyrazole (25.0 g) in DMF (22 ml) was added phosphoryl chloride (8.87 ml) dropwise with stirring under nitrogen and the resulting mixture heated at 100° C. for 3 hr. It was cooled, diluted with water and dichloromethane and basified with 50% sodium hydroxide with ice/water cooling. It was extracted with dichloromethane, the organic extracts washed with water, dried over anhydrous magnesium sulfate, filtered and evaporated under reduced pressure. The residue was purified by column chromatography over silica, eluting with ethyl acetate/i-hexane (1:19) followed by ethyl acetate to give the sub-title compound as a solid (12.61 g).

Provenance & Evidence