Diisopropylethylamine → 2-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)-N-(1-methylcyclobutyl)acetamide

Participants

Role	Name	HCID	Charge
Reactant	Diisopropylethylamine	HCID 81531	—
Reactant	Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)	HCID 9886157	—
Reactant	1-Methylcyclobutan-1-amine hydrochloride	HCID 18332449	—
Reactant	2-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)acetic acid	HCID 66575782	—
Solvent	Dimethylformamide	HCID 6228	—
Solvent	Ethyl Acetate	HCID 8857	—
Product	2-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)-N-(1-methylcyclobutyl)acetamide	HCID 66575941	18.9%

Reaction Steps

To a suspension of 2-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)acetic acid (100 mg, 0.27 mmol) in DMF (2 mL) were added 1-methyl-cyclobutyl amine hydrochloride (37 mg, 0.30 mmol), diisopropylethylamine (DIPEA) (150 μL, 0.60 mmol) and 2-(7-Aza-1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HATU) (125 mg, 0.33 mmol). The solution obtained was stirred at room temperature for 2 h then diluted with EtOAc. The organic phase was washed with water and brine, dried (MgSO4) and concentrated in vacuo. The resultant residue was purified by chromatography purification (silica gel, gradient 10-20% ethyl acetate/isohexane) yielding Compound 61 as a solid (22 mg).

Provenance & Evidence

DOI	10.6084/m9.figshare.5104873.v1
Patent number	US09260381B2
Source dataset	uspto-grants-2016_02
ORD ID	ord-dbc483ed6c3e4b40a4966ba4ca23504c
Source note	uspto-grants-2016_02