Cesium carbonate → (S)-tert-Butyl 4-(4-bromo-1H-pyrazol-1-yl)-1-(4-chlorophenyl)butan-2-ylcarbamate

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To a mixture of 4-bromopyrazole (1.26 g, 8.57 mmol) and cesium carbonate (4.66 g, 14.3 mmol) in DMF (20 mL) was added (3S)-3-((tert-butoxycarbonyl)amino)-4-(4-chlorophenyl)butyl methanesulfonate (2.70 g, 7.15 mmol). The mixture was stirred for 16 hours at room temperature. The mixture was diluted with DCM and washed with H2O (2×). The combined organic layers were dried over Na2SO4, filtered and concentrated. The residue was purified by column chromatography (EtOAc/Hexanes, 0-25%) to give the product as an off-white solid (2.86 g, 93%). LCMS (API-ES) m/z: 428, 430 (M+H+).

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