反应详情

A mixture of 1,1,3,3-tetramethoxypropane (3.7 g, 22.6 mmol), tert-butylhydrazine hydrochloride (2.8 g, 22.6 mmol), and conc. HCl (6 mL, 72 mmol) in EtOH (30 mL) was heated at reflux overnight. The reaction mixture was poured into water and the resulting mixture was extracted with ether (30 mL×3). The combined organics was washed with brine (20 mL), dried over MgSO4, and concentrated under reduced pressure to afford 1-tert-butyl-1H-pyrazole as a white solid (2.5 g, 89%). MS (ESI) m/z: 125 [M+H]+.

1. temperaturewas heated
2. temperatureat reflux overnight
3. extractionthe resulting mixture was extracted with ether (30 mL×3)
4. washThe combined organics was washed with brine (20 mL)
5. dry with materialdried over MgSO4
6. concentrationconcentrated under reduced pressure