Bromoacetone → 6-Chloro-2,8-dimethyl-imidazo[1,2-b]pyridazine

3-Amino-6-chloro-4-methylpyridazine (5.50 g, 38.3 mmol) and bromoacetone (6.90 g, 40.0 mmol) were heated in acetonitrile (50.0 ml) for 8 hours under reflux. The reaction solution was concentrated under reduced pressure, and water (100 ml) was added to the residues which were then adjusted to pH 9 with 20% aqueous sodium hydroxide and extracted twice with ethyl acetate. The extracts were combined, dried over anhydrous magnesium sulfate and concentrated, and the residues were purified by silica gel column chromatography (ethyl acetate:chloroform=1:2), to give the title compound as white crystals. The yield was 3.80 g (54.6%).

1. temperatureunder reflux
2. concentrationThe reaction solution was concentrated under reduced pressure, and water (100 ml)
3. additionwas added to the residues which
4. extractionextracted twice with ethyl acetate
5. dry with materialdried over anhydrous magnesium sulfate
6. concentrationconcentrated
7. customthe residues were purified by silica gel column chromatography (ethyl acetate:chloroform=1:2)

ORD record

ord-840f21d4cd094b6087ba5b437d42d3bc

Source dataset

uspto-grants-2013_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08399381B2