Water → phenyl [1-(2-hydroxyethyl)-5-(tritylamino)-1H-pyrazol-4-yl]carbamate

Participants

Reaction Steps

To a stirred solution of phenyl [5-amino-1-(2-hydroxyethyl)-1H-pyrazol-4-yl]carbamate (5.45 g) in N,N-dimethylformamide (55 ml) were added triethylamine (8.69 ml) and trityl chloride (6.37 g), and the mixture was stirred at room temperature for 1 hour. Water was added to the reaction mixture and the whole mixture was extracted with ethyl acetate. The extract was washed with water and brine and dried over anhydrous magnesium sulfate. Concentration under reduced pressure gave a crude product, which was triturated with ethyl acetate-diisopropyl ether (1:2). The resulting solid was collected by filtration to give phenyl [1-(2-hydroxyethyl)-5-(tritylamino)-1H-pyrazol-4-yl]carbamate (3.5 g).

Provenance & Evidence