Hydrogen Peroxide → HCID 18759996, compound

To a solution of 6-allyl-3,4-bis(4-methoxyphenyl)pyridazine (0.58 g, 1.7 mmol) in tetrahydrofuran (3 ml), a 0.5 M solution (8.7 ml) of 9-borabicyclo[3.3.1]nonane in tetrahydrofuran was added dropwise under an argon gas atmosphere while cooling the reaction system with ice-water. The resulting mixture was then stirred at room temperature for 15 hours. To the reaction mixture, water (1 ml) and then, 3 N caustic soda (3 ml) and 31% hydrogen peroxide (3 ml) were added under ice cooling, followed by stirring at room temperature for 2 hours. The reaction mixture was extracted with ethyl acetate, the organic layer was washed successively with water, a saturated aqueous solution of sodium hydrogencarbonate and water, and was then dried over anhydrous sodium sulfate. The extract was concentrated under reduced pressure and the resulting mixture was left over at room temperature for 3 days. The residue was separated and purified by chromatography on a silica gel column (ethyl acetate), whereby the title compound was obtained as a pale brown oil (0.54 g, 88.3%).

1. stirringby stirring at room temperature for 2 hours
2. extractionThe reaction mixture was extracted with ethyl acetate
3. washthe organic layer was washed successively with water
4. dry with materiala saturated aqueous solution of sodium hydrogencarbonate and water, and was then dried over anhydrous sodium sulfate
5. concentrationThe extract was concentrated under reduced pressure
6. waitthe resulting mixture was left over at room temperature for 3 days
7. customThe residue was separated
8. custompurified by chromatography on a silica gel column (ethyl acetate), whereby the title compound

ORD record

ord-35a77409cf0c45b896948e6ebc079f17

Source dataset

uspto-grants-2003_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06664256B1