Tris(hydroxymethyl)aminomethane → HCID 12043808, compound

Participants

Reaction Steps

265 mg (1 mmol) of 2-{4-[(tert-butoxycarbonyl)amino]phenyl}propanoic acid were treated at 4° C. under nitrogen with 146 μl (2 mmol) of thionylchloride. The reaction mixture was stirred for 2.5 hours and the temperature was gradually raised to room temperature. The mixture was taken up with tetrahydrofuran and evaporated thoroughly. The resulting acyl chloride, without any further purification, was dissolved in 3 ml of dry tetrahydrofuran and added dropwise to a solution of 178 mg (0.8 mmol) of tert-butyl-5-amino-3-cyclopropyl-1H-pyrazole-1-carboxylate in 3 ml of tetrahydrofuran. 312 mg (1 mmol, loading 3.2 mmol/g) of polymer supported triethylamine were then added under stirring. After 2.5 hours 80 mg (loading 3.2 mmol/g) of polymer supported trisamine were finally added in order to quench the excess of acyl chloride. After 2 hours, the resins were filtered and washed with methanol and dichloromethane. Evaporation of the filtrate afforded 263 mg of the title compound as a foam (70% yield).

Provenance & Evidence