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

Participants

Reaction Conditions

Reaction Steps

Fourteen grams of 3-(2-chloro-6,7-dimethoxyquinazolin-4-yl)phenylamine was suspended in 135 mL of a mixed solution consisting of tetrahydrofuran:isopropanol=2:1. To the reaction mixture was added 89 mL of a methylamine solution in methanol, and the reaction mixture was stirred in a pressure-resistant sealed tube reactor at 130° C. for 24 hours. After the reaction mixture was allowed to cool down to room temperature, it was diluted with 300 mL of ethyl acetate and then washed with 300 mL of water. A water layer was extracted with 100 mL of ethyl acetate, and the combined organic layer was washed with 100 mL of brine. The organic layer was separated and was then dried over anhydrous magnesium sulfate. The desiccant was removed by filtration, the organic layer was concentrated to dryness, and the resultant was triturated with a mixed solvent consisting of ethyl acetate:tetrahydrofuran=3:1. The obtained solid was filtrated, and the filtrate was then washed with ethyl acetate, and dried under aeration to yield 10 g of a product of interest. The filtrate was adsorbed on a 50 g silica gel column, and it was then eluted with a mixed solution consisting of ethyl acetate:methanol=9:1, and the eluent was concentrated to dryness. The residue was triturated with ethyl acetate, and the obtained solid was then filtrated. The solid was washed with diethyl ether, and dried under aeration to yield 1.4 g of a product of interest. Total yield: 82.9%

Provenance & Evidence