Imidazole → HCID 69331800, compound

Participants

Reaction Steps

Imidazole (680 mg) and t-butyldimethylsilyl chloride (903 mg) was added successively to a solution of ethyl 5-[4-{2-(hydroxy)ethoxy}phenyl]-1-(4-methoxyphenyl)-1H-pyrazole-3-carboxylate (1.91 g) in DMF (15 ml) under cooling in an ice bath. After stirring at ambient temperature for 2 hours, the mixture was partitioned between AcOEt and H2O. The oreganic layer was washed with H2O, saturated aqueous sodium chloride solution, dried over MgSO4, concentrated in vacuo. The residual crystals were collected and washed with n-hexane to give ethyl 5-[4-(2-{[tert-butyl(dimethyl)silyl]oxy}ethoxy)-phenyl]-1-(4-methoxyphenyl)-1H-pyrazole-3-carboxylate (2.34 g).

Provenance & Evidence