Acetic Acid → 7-Methoxy-4-oxo-1,4-dihydrobenzo[g]quinoline-3-carbonitrile
Reaction equation
C([Li])CCC.[C:6](#[N:8])[CH3:7].CN(/[CH:12]=[N:13]/[C:14]1[C:15]([C:26]([O:28]C)=O)=[CH:16][C:17]2[C:22]([CH:23]=1)=[CH:21][CH:20]=[C:19]([O:24][CH3:25])[CH:18]=2)C.C(O)(=O)C>O1CCCC1>[CH3:25][O:24][C:19]1[CH:20]=[CH:21][C:22]2[CH:23]=[C:14]3[C:15]([C:26](=[O:28])[C:7]([C:6]#[N:8])=[CH:12][NH:13]3)=[CH:16][C:17]=2[CH:18]=1Participants
Conditions
- Temperature
- -78 °C
Procedure
To a solution of 4.75 mL (11.88 mmol) of n-butyllithium (2.5M in hexane) in 4.0 mL of tetrahydrofuran at −78° C. is added dropwise a solution of 0.68 mL (13.1 mmol) of acetonitrile in 6.8 mL of tetrahydrofuran. After completion of addition, the suspension is stirred for 10 minutes. To this is added 1.36 g (4.75 mmol) of methyl 3-{[(E)-(dimethylamino)methylidene]amino}-7-methoxy-2-naphthoate in 32 mL of tetrahydrofuran dropwise. The resulting reaction mixture is stirred at −78° C. for 1 hour, at −5° C. for 1 hour and at room temperature for 15 minutes. The reaction mixture is again cooled to −78° C. and 1.72 g (28.6 mmol) of acetic acid is added dropwise. After addition of the acetic acid, the reaction mixture is allowed to warm to room temperature. The precipitate is collected by filtration and washed sequentially with water, acetonitrile and methanol. After drying in vacuo, this yields 796.9 mg (67%) of 7-methoxy-4-oxo-1,4-dihydrobenzo[g]quinoline-3-carbonitrile as a deep yellow solid, mp>260° C.
Workup
- additionAfter completion of addition
- customThe resulting reaction mixture
- stirringis stirred at −78° C. for 1 hour, at −5° C. for 1 hour and at room temperature for 15 minutes
- temperatureto warm to room temperature
- filtrationThe precipitate is collected by filtration
- washwashed sequentially with water, acetonitrile and methanol
- customAfter drying in vacuo
Sources & evidence
- ORD record
- ord-44e212385697476eaac688ef198c6546
- Source dataset
- uspto-grants-2006_09
- Patent number
- US07105531B2
Reaction notes
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