反应详情

温度

100 °C

To a mixture of 2-amino-4,5,3',4'-tetramethoxybenzophenone (453 mg), 6-(1-imidazolyl)-3-oxohexanoic acid ethyl ester (320 mg) and acetic acid (5 ml), concentrated sulfuric acid (0.03 ml) was added, followed by stirring at 100° C. for 2 hours. After the reaction mixture was concentrated under reduced pressure, the residue was poured over water, alkalinized with 2N sodium hydroxide and then extracted with chloroform. The chloroform layer was washed with water and dried (MgSO4), after which the solvent was distilled off. The residual oily substance was subjected to silica gel column chromatography and eluted with chloroform-methanol (50:1, v/v) to yield 6,7-dimethoxy-4-(3,4-dimethoxyphenyl)-2-[3-(1-imidazolyl)propyl]quinoline-3-carboxylic acid ethyl ester (310.0 mg, 43%), which was then recrystallized from ethyl acetate-hexane to yield a colorless prismatic crystal having a melting point of 164° to 165° C.

1. additionwas added
2. concentrationAfter the reaction mixture was concentrated under reduced pressure
3. additionthe residue was poured over water
4. extractionextracted with chloroform
5. washThe chloroform layer was washed with water
6. dry with materialdried (MgSO4)
7. distillationafter which the solvent was distilled off
8. washeluted with chloroform-methanol (50:1