Potassium Carbonate → 3-(4-Nitro-pyrazol-1-yl)-propan-1-ol

To a stirred solution of 4-nitro-1H-pyrazole (27) (1.0 g, 8.9 mmol) in MeCN (15 mL) was added K2CO3 (1.8 g, 13.2 mmol) and 3-bromo-propanol (880 μL, 9.7 mmol). The mixture was stirred at 75° C. for 6 hours. The solvent was evaporated in vacuo and the residue partitioned between H2O (15 mL) and EtOAc (15 mL). The layers were separated and the aqueous phase extracted with EtOAc (2×15 mL). The combined organics were dried (MgSO4), filtered and the solvent evaporated in vacuo to afford the title compound as a pale yellow oil (1.41 g, 93%); LCMS, Rt=1.31 min (MeOH-FA method), m/z 172 (MH+).