反应详情

To a solution of 16.8 g of [4-(3-aminophenyl)-6,7-dimethoxyquinazolin-2-yl]methylamine and 8.6 g of pyridine dissolved in 300 mL of tetrahydrofuran was added 11.8 g of 4-chlorocarbonylbenzoic acid methyl ester at room temperature, followed by stirring for 24 hours. To the reaction mixture was added 100 mL of dimethyl sulfoxide, the mixture was partitioned between a mixed solvent consisting of 2,000 mL of ethyl acetate and 1,000 mL of tetrahydrofuran, and 1,000 mL of a saturated sodium hydrogencarbonate solution, and the organic layer was separated. The water layer was further extracted with a mixed solvent consisting of 500 mL of ethyl acetate and 500 mL of tetrahydrofuran. The combined organic layer was then washed with 1,000 mL of a saturated sodium hydrogencarbonate solution and 1,000 mL of brine in this order, and dried over anhydrous magnesium sulfate. The desiccant was removed by filtration with 100 g of a basic silica gel pad, followed by well washing with 2,000 mL of ethyl acetate. The combined eluent was concentrated under reduced pressure, and the obtained crude product was suspended and triturated in a mixed solvent consisting of 100 mL of tetrahydrofuran and 500 mL of diethyl ether. The precipitated crystals were collected by filtration, washed twice with 100 mL of diethyl ether, and dried under aeration at 50° C. for 5 hours to yield 13.8 g of the crystals of the titled compound (yield: 53.2%).

1. customthe mixture was partitioned between a mixed solvent
2. customthe organic layer was separated
3. extractionThe water layer was further extracted with a mixed solvent
4. washThe combined organic layer was then washed with 1,000 mL of a saturated sodium hydrogencarbonate solution and 1,000 mL of brine in this order
5. dry with materialdried over anhydrous magnesium sulfate
6. customThe desiccant was removed by filtration with 100 g of a basic silica gel pad
7. washby well washing with 2,000 mL of ethyl acetate
8. concentrationThe combined eluent was concentrated under reduced pressure
9. customthe obtained crude product
10. customtriturated in a mixed solvent
11. filtrationThe precipitated crystals were collected by filtration
12. washwashed twice with 100 mL of diethyl ether
13. customdried under aeration at 50° C. for 5 hours