Hydrochloric Acid → Ethyl 1-cyclopropyl-8-difluoromethoxy-6,7-difluoro-5-nitro-1,4-dihydro-4-oxoquinoline-3-carboxylate

HRID 2226493Notes

Reaction equation

HRID 2226493 reaction equation
[CH:1]1([NH:4][CH:5]=[C:6]([C:12](=[O:29])[C:13]2[C:18]([N+:19]([O-:21])=[O:20])=[C:17]([F:22])[C:16]([F:23])=[C:15]([O:24][CH:25]([F:27])[F:26])[C:14]=2F)[C:7]([O:9][CH2:10][CH3:11])=[O:8])[CH2:3][CH2:2]1.[H-].[Na+].Cl>O1CCCC1>[CH:1]1([N:4]2[C:14]3[C:13](=[C:18]([N+:19]([O-:21])=[O:20])[C:17]([F:22])=[C:16]([F:23])[C:15]=3[O:24][CH:25]([F:26])[F:27])[C:12](=[O:29])[C:6]([C:7]([O:9][CH2:10][CH3:11])=[O:8])=[CH:5]2)[CH2:3][CH2:2]1

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 24758Sodium hydrideHCID 178471895HCID 178471895, compound

Product 1

HCID 15023843Ethyl 1-cyclopropyl-8-difluoromethoxy-6,7-difluoro-5-nitro-1,4-dihydro-4-oxoquinoline-3-carboxylateYield 61.8%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

1.0 g (0.0024 moles) of ethyl 3-cyclopropylamino-2-(3-difluoromethoxy-2,4,5-trifluoro-6-nitrobenzoyl)acrylate [(XIX), R1 =--OCHF2, R3' =NO2, R17 =C2H5, X=X'=F] prepared as described in step (d) above] was dissolved in 10 ml of tetrahydrofuran, and 0.094 g (0.0024 moles) of a 60% w/w suspension of sodium hydride in mineral oil was added to the resulting mixture. The mixture was then stirred at room temperature for 1 hour, after which 1N aqueous hydrochloric acid was added, and the mixture was vigorously stirred to acidify the whole mixture. The crystals which precipitated were collected by filtration and washed with water and with diethyl ether, in that order, to give 0.6 g of ethyl 1-cyclopropyl-8-difluoromethoxy-6,7-difluoro-5-nitro-1,4-dihydro-4-oxo-quinoline-3-carboxylate as a pale yellow powder, melting at 262°-268° C.

Workup

  1. additionwas added to the resulting mixture
  2. stirringthe mixture was vigorously stirred
  3. customThe crystals which precipitated
  4. filtrationwere collected by filtration
  5. washwashed with water and with diethyl ether, in that order

Sources & evidence

ORD record
ord-dc18d35a0fc94c0388f877310fdeb0ff
Source dataset
uspto-grants-1994_09
Patent number
US05348961

Reaction notes

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