Cesium carbonate → 2-(3,5-dimethyl-4-nitro-1H-pyrazol-1-yl)ethanol

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To a solution of 3,5-dimethyl-4-nitro-1H-pyrazole (500 mg, 3.52 mmol) in MeCN (5 mL), Cs2CO3 (1.26 g, 3.87 mmol) and 2-bromoethanol (0.3 mL, 4.21 mmol) was added. The resulting mixture was refluxed (90° C.) for 3 h, then the reaction mixture was allowed to reach rt. The mixture was diluted with DCM, filtered, the filter cake rinsed with DCM and the filtrate concentrated in vacuo. The residue was partitionned between water and EtOAc, the org. layer was separated and the aq. layer was extracted with EtOAc (1×). The combined org. layers were washed with brine, dried (MgSO4), filtered and concentrated in vacuo to yield 2-(3,5-dimethyl-4-nitro-1H-pyrazol-1-yl)ethanol as a white solid. LC-MS conditions A: tR=0.53 min, [M+H]+=186.39.

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