Sulfuric Acid → HCID 22989226, compound

Reaction equation

S(=O)(=O)(O)O.[Cl:6][C:7]1[CH:8]=[CH:9][C:10]2[N:11]([CH:13]=[C:14]([C:16]([CH3:22])([CH3:21])[C:17](OC)=[O:18])[N:15]=2)[N:12]=1.[CH:23]([OH:26])([CH3:25])[CH3:24]>>[Cl:6][C:7]1[CH:8]=[CH:9][C:10]2[N:11]([CH:13]=[C:14]([C:16]([CH3:22])([CH3:21])[C:17]([O:26][CH:23]([CH3:25])[CH3:24])=[O:18])[N:15]=2)[N:12]=1

Participants

Reactant 3

HCID 1118Sulfuric Acid

HCID 3776Isopropanol

HCID 11075988HCID 11075988, compound

Product 1

HCID 22989226HCID 22989226, compound

Procedure

In 18 ml of isopropanol, 995 mg of concentrated sulfuric acid was dissolved; 1.0 of methyl 2-(6-chloroimidazo[1,2-b]pyridazin-2-yl)-2-methylpropionate was added, followed by thermal refluxing for 40 hours. After cooling, the mixture was concentrated under reduced pressure, neutralized by the addition of aqueous sodium bicarbonate and extracted with ethyl acetate. The extract was washed with saturated saline and dried with magnesium sulfate. The dry product was concentrated under reduced pressure; the crystal precipitated was collected, washed with hexane and dried to yield 794 mg of the title compound. The filtrate was concentrated under reduced pressure; the residue was subjected to silica gel column chromatography and eluted with hexane:ethyl acetate (5:1). The desired fraction was collected and dried to yield 215 mg of the title compound.