Isopropanol → [4-(3-Aminophenyl)-6,7-dimethoxyquinazolin-2-yl]methylamine

Participants

Reaction Conditions

Reaction Steps

Two hundred grams of crude 3-(2-chloro-6,7-dimethoxyquinazolin-4-yl)phenylamine (content 124 g; 0.394 mol) was suspended in a mixed solution consisting of 1.2 L of tetrahydrofuran and 0.6 L of isopropanol. To the mixture was added 1.2 L of a methylamine solution in methanol, and the mixture was stirred in a SUS autoclave at 90° C. for 15 hours. The reaction mixture was allowed to cool down to 25° C., and concentrated under reduced pressure. To the residue were added 1.0 L of water and 4.0 L of chloroform, and the mixture was stirred at 50° C. for 0.5 hours and allowed to cool down to 25° C. The mixture was filtered through celite to remove the insoluble matter, and the filtrate was transferred to separatory funnel and the organic layer was separated. To the separated organic layer were added 50.0 g of anhydrous magnesium sulfate and 20.0 g of activated carbon, and the mixture was stirred at 50° C. for 1 hour and allowed to cool down to 25° C. The mixture was filtered through celite to remove the insoluble matter, and the filtrate was concentrated under reduced pressure. To the residue was added 904 mL of chloroform, and the mixture was stirred at 50° C. for 1 hour and stirred overnight after turning off the heater. Then the mixture was stirred in an ice bath for 2 hours and precipitated crystals were collected by filtration. The collected crystals were dried at 50° C. under reduced pressure to give 76.3 g of a target product. Yield: 38.7%

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