Diisopropylethylamine → HCID 66576021, compound

Participants

Reaction Steps

A solution of diisopropylethylamine (DIPEA) (120 μL, 0.67 mmol) and 1-acetylpiperazine (38 mg, 0.3 mmol) in CH2Cl2 (1 mL) was added to a mixture of 2-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)acetic acid (100 mg, 0.27 mmol), N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDC) (60 mg, 0.3 mmol) and 2-hydroxypyridine-N-oxide (HOPO) (30 mg, 0.27 mmol). The solution obtained was stirred at room temperature for 18 h then 1-acetylpiperazine (10 mg, 0.08 mmol) and N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (EDC) (30 mg, 0.15 mmol) were added. After a further 3.5 h the reaction was purified using chromatography (silica gel, gradient 0 to 5% triethylamine/acetone) followed by preparative HPLC yielding Compound 66 as a white solid (32.2 mg).

Provenance & Evidence