反应详情

To a solution of 8-amino-1-methyl-4,5-dihydro-1H-pyrazolo[4,3-h]quinazoline-3-carboxamide (244 mg, 1.0 mmol) in a mixture of glacial acetic acid/methanol/water (1:1:1) (30 mL) in a round-bottom flask were added p-methoxybenzaldehyde (0.44 mL, 450 mg, 3.0 mmol) and then 85% sodium cyanoborohydride (210 mg, 2.0 mmol). The solution was stirred at room temperature for 7 hours. At that time further amount of aldehyde (0.44 mL) and sodium cyanoborohydride (210 mg) were added and stirring was continued overnight. The reaction mixture was poured into ice-water (200 mL), the pH was adjusted to 10 by addition of saturated sodium carbonate and the solution extracted with ethyl acetate (4×20 mL). The collected organic extracts were washed with brine until neutral, with water and dried over Na2SO4.

1. stirringstirring
2. waitwas continued overnight
3. extractionthe solution extracted with ethyl acetate (4×20 mL)
4. washThe collected organic extracts were washed with brine until neutral, with water
5. dry with materialdried over Na2SO4