Cesium carbonate → Methyl 4-((tert-butoxycarbonyl)amino)-2,6-difluorobenzoate

Participants

Reaction Conditions

Reaction Steps

Under argon, a microwave vessel was charged with 54 mg (0.22 mmol) of methyl 4-bromo-2,6-difluorobenzoate, 118 mg (1.01 mmol, 4.7 eq.) of tert-butyl carbamate, 4.6 mg (0.02 mmol, 0.1 eq.) of palladium(II) acetate, 15 mg (0.026 mmol, 0.13 eq.) of Xantphos, 137 mg (0.42 mmol, 2 eq.) of caesium carbonate and 2 ml of 1,4-dioxane. A stream of argon was passed through the suspension for 2 min. The reaction mixture was heated in the microwave at 140° C. for 20 min. After filtration through kieselguhr, the filtrate was concentrated under reduced pressure. The crude product was purified by normal phase chromatography (mobile phase: dichloromethane/methanol 10-50% mixtures). Yield: 37 mg (60% of theory)

Provenance & Evidence