p-Toluenesulfonic acid → HCID 178432087, compound

Participants

Reaction Conditions

Reaction Steps

A round-bottomed flask equipped with a Dean-Stark apparatus was charged with ethyl 3-oxo-2-(4-(trifluoromethyl)benzyl)butanoate (7.00 g, 24.3 mmol, Intermediate 26: step a), 4-bromoaniline (4.20 g, 24.2 mmol), para-toluenesulfonic acid (0.418 g, 2.4 mmol), and toluene (121 mL). The mixture was heated to 125° C. After 16 hours, the flask was cooled to room temperature. The toluene was removed by rotary evaporation to provide an orange colored solid. A mixture of the solid and diphenyl ether (48.4 mL) was heated to 220° C. After 60 minutes, the mixture was cooled to room temperature at which point a yellow solid crashed out of solution. Hexanes (150 mL) were added. The mixture was filtered through filter paper, rinsing with hexanes. The yellow solids were collected, dried, and then used in the next step without further purification.

Provenance & Evidence