Cesium carbonate → HCID 22281967, compound

Participants

Reaction Steps

To 3-amino-1-methyl-4-(4-methylphenyl)-1H-pyrazol-5-ol (Preparation 3b) (855 mg) in dimethylformamide (10 ml) at room temperature was added cesium carbonate (4.11 g) and 2-bromoethyl acetate (703 mg), the mixture was stirred for 45 minutes. The reaction was diluted with 2M hydrochloric acid (10 ml) and extracted with ether (2×100 ml). The organic fractions were combined, washed with water (2×100 ml) and brine (100 ml), dried over magnesium sulfate, filtered and concentrated under reduced pressure. The residue was purified by column chromatography (silica, 30 g) eluted with ethyl acetate:hexane (5:1) to yield the title compound as a white solid (155 mg).

Provenance & Evidence