Short-RInChIKey=SA-FUHFF-UHFFFADPSC-SSAXAAXODL-UHFFFADPSC-NUHFF-NICYD-NUHFF-ZZZ

To a cooled 0 °C solution of 5-methyl-1H-pyrazol-3-amine (1.00 g, 10.3 mmol, 1.00 equiv) in aqueous hydrochloric acid (10 mL, 6 M), a solution of sodium nitrite (781 mg, 11.3 mmol, 1.10 equiv) in water (6 mL) was added dropwise. The mixture was stirred for 1 h at 0 °C. Then, a 40% aqueous solution of N-propan-2-ylpropan-2-amine (10.4 g, 14.4 mL, 103 mmol, 10.0 equiv) was added. The solution was slowly warmed to room temperature and was stirred in the dark for 16 hours. The reaction mixture was extracted with methylene chloride. The combined organic phases were dried over Na2SO4 and filtered.