反应详情

温度

100 °C

To a mixture of 2-amino-4,5,3',4'-tetramethoxybenzophenone (6.3 g) and cyanoacetic acid methyl ester (23 ml), powdered aluminum chloride (5.3 g) was added, followed by stirring at 100° C. for 2.5 hours. The reaction mixture was poured over water and extracted with ethyl acetate. The ethyl acetate layer was washed with water and dried (MgSO4), after which the solvent was distilled off. The residue was subjected to silica gel column chromatography and eluted with hexane-ethyl acetate (4:1, v/v) to yield 6,7-dimethoxy-4-(3,4-dimethoxyphenyl)quinazoline-2-acetic acid methyl ester (4.4 g, 55%), which was then recrystallized from isopropyl ether to yield a colorless needle crystal having a melting point of 152° to 153° C.

1. additionwas added
2. extractionextracted with ethyl acetate
3. washThe ethyl acetate layer was washed with water
4. dry with materialdried (MgSO4)
5. distillationafter which the solvent was distilled off
6. washeluted with hexane-ethyl acetate (4:1