tert-Butanol → 1-Methyl-5-phenoxy-1H-pyrazol-4-ylamine

Participants

Reaction Conditions

Reaction Steps

To a stirred mixture of 1-Methyl-5-phenoxy-1H-pyrazole-4-carboxylic acid (16.00 g; 73.32 mmol), t-BuOH (51.20 g; 690.77 mmol) in 1,4-dioxane under argon was added DIPEA (37.44 g; 289.69 mmol) and Diphenylphosphoryl azide (41.60 g; 151.16 mmol). After 10 minutes at ambient temperature it was heated up to 110° C. and stirred there for 3 hours. The solvent was evaporated and the crude material purified by column chromatography. This compound was dissolved in DCM and treated with 4 M HCl in 1,4-dioxane. It was stirred for 2 days at ambient temperature. The solvent was evaporated and the residue dissolved in water and washed with EtOAc. The aqueous layer was basified with NaHCO3 solution and extracted with EtOAc. The organic layer was dried and concentrated to dryness.

Provenance & Evidence