Diethyl Malonate → 6-Nitro-2-oxo-1,2-dihydro-quinoline-3-carboxylic acid ethyl ester
Reaction equation
[NH2:1][C:2]1[CH:9]=[CH:8][C:7]([N+:10]([O-:12])=[O:11])=[CH:6][C:3]=1[CH:4]=O.[C:13](OCC)(=[O:20])[CH2:14][C:15]([O:17][CH2:18][CH3:19])=[O:16]>>[N+:10]([C:7]1[CH:6]=[C:3]2[C:2](=[CH:9][CH:8]=1)[NH:1][C:13](=[O:20])[C:14]([C:15]([O:17][CH2:18][CH3:19])=[O:16])=[CH:4]2)([O-:12])=[O:11]Participants
Procedure
A solution of 10.0 g (46 mmol) of 1,2-dihydro-2-oxo-3-quinolinecarboxylic acid, ethyl ester [J. Chem. Soc., 2518 (1962)] and 50 ml of sulfuric acid is stirred in an ice bath and a cold mixture of 9.75 ml of 70% nitric acid and 9.75 ml of sulfuric acid is added dropwise over 10 minutes. The reaction solution is stirred with ice bath cooling for 1 hour and then is poured into ice and water with stirring. The resulting solid is collected by filtration and washed with water and ethanol. After drying, 10.7 g of the requisite ester is obtained, mp>310°. The structure is assigned by an unequivocal synthesis from the condensation of 2-amino-5-nitrobenzaldehyde and diethyl malonate to give the same 1,2-dihydro-6-nitro-2-oxo-3-quinolinecarboxylic acid, ethyl ester.
Sources & evidence
- ORD record
- ord-345f79d1ec8547beb3e6d7b9bae7c9ba
- Source dataset
- uspto-grants-1983_02
- Patent number
- US04374138
Reaction notes
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