1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → 3-((4-((6-(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-carboxamido)pyridin-3-yl)oxy)pyridin-2-yl)carbamoyl)cyclobutyl acetate

Participants

Reaction Conditions

Reaction Steps

To a solution of N-(5-((2-aminopyridin-4-yl)oxy)pyridin-2-yl)-1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-carboxamide (50 mg, 0.12 mmol), HOAT (19 mg, 0.24 mmol), EDCI (28 mg, 0.14 mmol) and DIPEA (0.1 mL, 0.6 mmol) in DMF (5 mL) was added a solution of 3-acetoxycyclobutanecarboxylic acid in DMF (5 mL) at 0° C. The reaction was heated at 120° C. for 5 hours, then cooled to rt, diluted with water (50 mL) and extracted with EtOAc (30 mL×3). The combined organic phases were washed with brine (10 mL), dried over anhydrous Na2SO4, filtered, and concentrated in vacuo. The resulted residue was purified by a silica gel column chromatography (DCM/EtOAc (v/v)=1/2) to give the title compound as a white solid (20 mg, 30%).

Provenance & Evidence