反应详情

A mixture of 2-chloromethyl-4-(3,4-dimethoxyphenyl)-6,7-dimethoxyquinazoline (2.0 g), piperidine (2.27 g) and ethanol (40 ml)-dichloromethane (10 ml) was stirred at room temperature for 3 days. The reaction mixture was concentrated under reduced pressure, and dichloromethane (50 ml) was added to the residue. The dichloromethane layer was washed with water and dried over magnesium sulfate, and the solvent was evaporated. The residue was subjected to column chromatography on silica gel. The fractions eluted with chloroform-ethyl acetate (1/1, v/v) gave 4-(3,4-dimethoxyphenyl)-6,7-dimethoxy-2-piperidinomethylquinazoline (1.46 g, 65%) which was then recrystallized from ethyl acetate-hexane. Colorless needles. mp. 130°-132° C.

1. concentrationThe reaction mixture was concentrated under reduced pressure, and dichloromethane (50 ml)
2. additionwas added to the residue
3. washThe dichloromethane layer was washed with water
4. dry with materialdried over magnesium sulfate
5. customthe solvent was evaporated
6. washThe fractions eluted with chloroform-ethyl acetate (1/1