反应详情

温度

115 °C

The method described in Part F of Example 46 was used to couple 4-bromo-5-(4-chlorobutyl)-1-methyl-1H-pyrazole-3-carbonitrile (16.0 g, 60.0 mmol) and 2-aminophenylboronic acid hydrochloride (20.8 g, 0.120 mol). After the mixture was heated at 115° C. for 24 hours, it was cooled to ambient temperature and filtered through a plug of silica gel (eluting with 3:2 chloroform/methanol). The filtrate was concentrated under reduced pressure and dissolved in ethanol (300 mL). Hydrogen chloride (45 mL of a 4 M solution in ethanol) was added to the solution, and the reaction was heated at reflux for two hours and then cooled to ambient temperature. A precipitate formed and was isolated by filtration and washed with ethanol to provide 1-(4-chlorobutyl)-2-methyl-2H-pyrazolo[3,4-c]quinolin-4-amine hydrochloride. The filtrate was concentrated under reduced pressure and the resulting solid was dissolved in dichloromethane and water. The pH of the solution was raised to 14 using 50% aqueous NaOH while keeping the temperature at 0° C. by adding ice. The layers were separated, the aqueous layer was extracted with additional dichloromethane, the organic layers were combined, dried over Na2SO4, filtered and concentrated to a dark yellow oily solid. The residue was purified by chromatography using a HORIZON HPFC system (40+M cartridge, eluting with 0-30% CMA in chloroform) followed by recrystallization from acetonitrile to provide 1-(4-chlorobutyl)-2-methyl-2H-pyrazolo[3,4-c]quinolin-4-amine. This solid was purified as light tan crystals, mp 188-189° C.

1. temperatureit was cooled to ambient temperature
2. filtrationfiltered through a plug of silica gel (eluting with 3:2 chloroform/methanol)
3. concentrationThe filtrate was concentrated under reduced pressure
4. dissolutiondissolved in ethanol (300 mL)
5. additionHydrogen chloride (45 mL of a 4 M solution in ethanol) was added to the solution
6. temperaturethe reaction was heated
7. temperatureat reflux for two hours
8. temperaturecooled to ambient temperature
9. customA precipitate formed
10. customwas isolated by filtration
11. washwashed with ethanol