Hydrochloric Acid → 5-pyrrolidin-1-yl-7-(tetrahydro-2H-pyran-4-ylamino)pyrazolo[1,5-a]pyrimidine-2-carboxylic acid

Participants

Reaction Steps

To a solution of ethyl 5-pyrrolidin-1-yl-7-(tetrahydro-2H-pyran-4-ylamino)pyrazolo[1,5-a]pyrimidine-2-carboxylate (1.89 g, 5.26 mmol) in ethanol (25 mL) and tetrahydrofuran (25 mL) was added 1N aqueous sodium hydroxide (10.5 mL, 10.5 mmol) at room temperature. After being stirred for 23 h at same temperature, 6N aqueous hydrochloric acid (1.75 mL, 3.50 mmol), and then the reaction mixture was concentrated in vacuo. The residue was triturated with diisopropyl ether to give 5-pyrrolidin-1-yl-7-(tetrahydro-2H-pyran-4-ylamino)pyrazolo[1,5-a]pyrimidine-2-carboxylic acid. MS (APCI): m/z 330 (M−H).

Provenance & Evidence