Sulfuric Acid → 3-Acetyl-4-(3,4-dimethoxyphenyl)-6,7-dimethoxy-2-methylquinoline

HRID 1684570Notes

Reaction equation

S(=O)(=O)(O)O.[NH2:6][C:7]1[CH:24]=[C:23]([O:25][CH3:26])[C:22]([O:27][CH3:28])=[CH:21][C:8]=1[C:9]([C:11]1[CH:16]=[CH:15][C:14]([O:17][CH3:18])=[C:13]([O:19][CH3:20])[CH:12]=1)=O.[C:29]([CH2:32][C:33](=O)[CH3:34])(=[O:31])[CH3:30]>C(O)(=O)C>[C:29]([C:32]1[C:33]([CH3:34])=[N:6][C:7]2[C:8]([C:9]=1[C:11]1[CH:16]=[CH:15][C:14]([O:17][CH3:18])=[C:13]([O:19][CH3:20])[CH:12]=1)=[CH:21][C:22]([O:27][CH3:28])=[C:23]([O:25][CH3:26])[CH:24]=2)(=[O:31])[CH3:30]

Participants

Conditions

Temperature: 100 °C

Procedure

Conc. sulfuric acid (0.185 ml ) was added to a mixture of 2-amino-4,5,3',4'-tetramethoxybenzophenone (10.0 g), acetylacetone (3.78 g) and acetic acid (75 ml), and the mixture was stirred at 100° C. for 2.5 hours. The reaction mixture was concentrated under reduced pressure. The residue was poured into water and made alkaline with 2N sodium hydroxide, and extracted with chloroform. The chloroform layer was washed with water and dried over magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was subjected to column chromatography on silica gel. The fractions eluted with chloroform-ethanol (20:1, v/v) gave 3-acetyl-4-(3,4-dimethoxyphenyl )-6,7-dimethoxy-2-methyl-quinoline (9.78 g, 82%). This compound was recrystallized from dichloromethane-ethanol to give colorless prisms, mp. 210°-211° C.

Workup

concentrationThe reaction mixture was concentrated under reduced pressure
additionThe residue was poured into water
extractionextracted with chloroform
washThe chloroform layer was washed with water
dry with materialdried over magnesium sulfate
customthe solvent was evaporated under reduced pressure
washThe fractions eluted with chloroform-ethanol (20:1

Sources & evidence

ORD record: ord-fbcc5e3df8d6401fb0e024afd5a354a4
Source dataset: uspto-grants-1997_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05641788

Reaction notes

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