1-Hydroxybenzotriazole → HCID 56832628, compound

Participants

Reaction Steps

2-Fluoro-5-[(4-oxo-3H-phthalazin-1-yl)methyl]benzoic acid 1a (598 mg, 2 mmol) was dissolved in 10 mL of N,N-dimethylformamide, followed by addition of 1-hydroxybenzotriazole (135 mg, 1 mmol), crude N-methyl-3-(trifluoromethyl)-5,6,7,8-tetrahydroimidazo[1,5-a]pyrazine-1-carboxamide 13a (498 mg, 2 mmol), 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride (573 mg, 3 mmol) and N, N-diisopropylethylamine (774 mg, 6 mmol). After stirring for 12 hours, the reaction mixture was concentrated under reduced pressure, added with 30 mL of H2O, extracted with ethyl acetate (50 mL×3). The organic phase was combined, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated under reduced pressure and the resulting residue was purified by thin layer chromatography with elution system A to obtain 7-[2-fluoro-5-[(4-oxo-3H-phthalazin-1-yl)methyl]benzoyl]-N-methyl-3-(trifluoromethyl)-6,8-dihydro-5H-imidazo[1,5-a]pyrazine-1-carboxamide 13 (650 mg, yield 61.0%) as a white solid.

Provenance & Evidence