Ammonia → HCID 57527000, compound

Participants

Reaction Steps

1-(4-{[Benzyloxycarbonyl]amino}-2-fluorophenyl)-1H-pyrazole-4-carboxylic acid (1.1 g, 3.1 mmol) (Intermediate 41) and benzotriazole-1-yl-oxy-trispyrrolidinophosphonium hexafluorophosphate (PyBob) (1.61 g, 3.1 mmol) were slurried in dichloromethane (25 ml), and triethylamine (0.43 ml, 3.1 mmol) was added. Excess ammonia solution in ethanol (2M) was added and the resulting mixture was stirred for 1 hour. The solvent removed under reduced pressure and the residue was taken up in water. It was basified by adding 1M sodium hydroxide solution, and then extracted with ethyl acetate, dried over magnesium sulfate and concentrated under vacuum. Chromatography on silica gel with 0-1% methanol in ethyl acetate gave the title compound (0.82 g).

Provenance & Evidence