Hydrochloric Acid → 1-(4,6-Dimethoxypyrimidin-2-yl)-3-(6-ethyl-2-methylimidazo[1,2-b]pyridazin-3-ylsulfonyl)urea

As shown in the above reaction scheme, 6-ethyl-2-methylimidazo[1,2-b]pyridazin-3-ylsulfonamide (0.60 g, 2.50 mmol) and phenyl N-(4,6-dimethoxypyrimidin-2-yl)carbamate (0.76 g, 2.76 mmol) were suspended in acetonitrile (10 ml) and stirred under ice-cooling, during which DBU (0.46 g, 3.02 mmol) was added thereto. The temperature of the reaction solution was increased to room temperature, and the mixture was stirred at the same temperature for 4 hours. The reaction solution was poured into ice-water (150 ml) and adjusted to pH 3 with conc. hydrochloric acid. The reaction mixture was stirred at room temperature for 5 minutes, and the precipitated crystals were washed with water, acetonitrile and diethyl ether in this order, and collected by filtration. The crystals were dried under reduced pressure to give the title compound as colorless crystals. The yield was 0.55 g (52%), and the melting point was 172 to 174° C.

1. additionwas added
2. stirringthe mixture was stirred at the same temperature for 4 hours
3. stirringThe reaction mixture was stirred at room temperature for 5 minutes
4. washthe precipitated crystals were washed with water, acetonitrile and diethyl ether in this order
5. filtrationcollected by filtration
6. customThe crystals were dried under reduced pressure

ORD record

ord-0aca05085bd749e699818794a10a6222

Source dataset

uspto-grants-2010_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07816526B2