Malonate Ion → Ethyl 7-fluoro-5,6-dimethoxy-4-oxo-1,4-dihydroquinoline-3-carboxylate

HRID 525934Notes

Reaction equation

C1C=CC(C2C=CC=CC=2)=CC=1.C1C=CC(OC2C=CC=CC=2)=CC=1.[F:26][C:27]1[CH:28]=[C:29]([NH:37][CH:38]=[C:39]([C:45]([O:47]CC)=O)[C:40]([O:42][CH2:43][CH3:44])=[O:41])[CH:30]=[C:31]([O:35][CH3:36])[C:32]=1[O:33][CH3:34].C([O-])(=O)CC([O-])=O.FC1C(OC)=C(OC)C=C2C=1C(=O)C(C(OCC)=O)=CN2>CCCCCC>[F:26][C:27]1[CH:28]=[C:29]2[C:30]([C:45](=[O:47])[C:39]([C:40]([O:42][CH2:43][CH3:44])=[O:41])=[CH:38][NH:37]2)=[C:31]([O:35][CH3:36])[C:32]=1[O:33][CH3:34]

Participants

Conditions

Temperature: 250 °C

Procedure

To Dowtherm (150 mL) heated at 250° C. was added diethyl 2-(((3-fluoro-4,5-dimethoxyphenyl)amino)methylene)malonate (30 g, 87 mmol). The mixture was stirred at 250° C. for 30 min. LCMS indicated completion of the reaction. The reaction mixture was allowed to cool a bit and was then added to cold hexane, the precipitates were collected by filtration, washed with hexane and then allowed to dry in the air. Similar scale reactions were repeated several times. From a total amount of the malonate (148 g, 434 mmol), a mixture of ethyl 5-fluoro-6,7-dimethoxy-4-oxo-1,4-dihydroquinoline-3-carboxylate and ethyl 7-fluoro-5,6-dimethoxy-4-oxo-1,4-dihydroquinoline-3-carboxylate was obtained as brown solid without further purification (103 g, 349 mmol, 80% yield). LCMS: (M+H)+: 296.1.

Workup

customcompletion of the reaction
temperatureto cool a bit
filtrationthe precipitates were collected by filtration
washwashed with hexane
customto dry in the air

Sources & evidence

ORD record: ord-e3d1f5c85dcb44d7a8c071f54d74ad8e
Source dataset: uspto-grants-2016_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09340556B2

Reaction notes

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